Herniated disc – Knowledge

1. Why this text?

Few diagnoses cause as much fear as this one. "Herniated disc" sounds like something that has fallen out and needs to go back in. Like damage that stays. Like an operation that will come sooner or later.

We see it almost every day: someone arrives holding an MRI report, has looked the finding up online and has barely moved since – worried about making things worse. The fear is understandable. It is usually just larger than the situation warrants.

Because the course is generally good. The great majority of people with a herniated disc become free or nearly free of symptoms without surgery. The tissue pressing on the nerve disappears again by itself in many cases – the body breaks it down. And the operation that so often looms brings quicker relief to the leg, but after a year the operated group does no better in the trials than the group that was not operated on.

There is, however, one exception, and it matters. A small proportion of cases belongs in medical hands immediately – the same day. Which signs those are is set out below in section 4. If you read only one section of this text, read that one.

This text explains what a herniated disc actually is, why it hurts, how it is recognised, what an MRI really tells you, how the course looks without treatment, what physiotherapy can and cannot do, and – as a chapter of its own – when surgery is the right decision and when it is not. Every statement is referenced; the numbers in square brackets point to the reference list at the end.

And one clarification right at the start: in everyday use, "disc" stands for two different problems – low back pain that comes from the segment itself, and symptoms that come from an irritated nerve root and travel into the leg. This text is about the second. Why that is more than quibbling over words is set out in section 2.2.

One note in advance: this article does not replace individual advice. Anyone who has already had surgery, has another spinal condition or has marked neurological deficits will receive a recommendation tailored to their own situation – and that takes precedence over everything described here.

2. What a herniated disc is

2.1 How a disc is built

Between every two vertebral bodies lies an intervertebral disc. It is a cushion and a joint at the same time: it distributes pressure and allows the spine to bend and rotate. There are 23 of them in total, from the neck down to the sacrum.

Each disc consists of two parts:

• On the outside the fibrous ring (technical term: anulus fibrosus). It is made of several layers of tough fibres that cross over each other – rather like the plies of a car tyre. It holds the contents in place.
• On the inside the gel-like core (technical term: nucleus pulposus). A soft, water-rich tissue that deforms under pressure and spreads that pressure evenly outwards.

Directly behind every disc runs the spinal canal. The spinal cord itself ends in most people at the level of the first or second lumbar vertebra; below that, only a bundle of nerve roots continues downwards, the "cauda equina" (see section 4). In the lumbar spine – where the great majority of herniations sit – what lies behind the disc is therefore nerve roots, not spinal cord. This neighbourhood explains the whole condition: when disc tissue shifts backwards, that is exactly what it finds next to it.

2.2 Two different problems – and this text is about the second

Before we come to terminology, a point that clears up a good deal of confusion. Two different problems travel under the heading "disc". They need to be kept apart: they feel different, they are examined differently and they are partly treated differently.

• Symptoms coming from the disc and its spinal segment itself. No nerve root is involved here. The pain sits in the low back, at most radiating into the buttock or upper thigh, tends to be dull, and depends on posture and load. Professionals call this axial back pain – axial because it stays on the axis of the spine.
• Symptoms coming from an irritated nerve root. Here displaced disc tissue irritates or presses on a root. The pain travels into the leg, follows a particular strip, is burning or electric, and sensory disturbance or loss of strength may be added. This is radicular pain, or radiculopathy (see section 3.1).

This article is about the second picture. Where it speaks of a "herniated disc", it means the herniation that affects a nerve root. That is where the evidence is by far the densest, and where the questions arise that most people come with: is a scan needed? Is surgery needed? For pure low back pain without leg symptoms much of this does not apply – see our article on back pain.

Why the distinction changes something in practice. Surgery removes the tissue pressing on the root – so it treats the second problem, not the first. That is why it works well against leg pain and little against back pain (see section 9.5). The warning signs, the course and the regression figures further down all refer to the root problem as well.

And it is not the case that the disc plays no part in the first picture. As degeneration progresses, fine nerve fibres and vessels grow into regions of the disc that were previously nerve-free – a plausible route by which the segment itself can generate pain (see section 2.4). It just can hardly be established in the individual case, and a scan does not settle it (see section 2.6). The two also occur together often enough: many people with a root problem also have low back pain – the question is then not "either/or" but which of the two is currently in the foreground.

2.3 Bulge, herniation, sequestration – three stages

Reports use several terms that mean different things. Radiologists follow an internationally agreed nomenclature here [47]. It distinguishes the terms not by whether the fibrous ring still holds, but by the shape of the displaced tissue – by how wide its base at the disc is compared with how far it reaches out:

• Bulge (protrusion). Disc tissue extends in a localised way beyond the normal edge of the disc, and the base of that bulge is wider than the part projecting outwards. Picture a shallow bump.
• Herniation (extrusion). The displaced tissue reaches further out than its connection to the disc is wide – it sits like a drop on a narrow neck.
• Sequestration. An extrusion whose displaced fragment has no connection to the disc at all any more and lies free in the spinal canal.

A widespread notion holds that "protrusion" means the fibrous ring is still intact and "extrusion" means it has been breached. It is not that simple: the fibrous ring can be torn in a protrusion too. The terms describe the shape of what can be seen on the image – not the state of every individual fibre.

Here is the surprise: the further the tissue has come out, the better the prospect that it will regress on its own (see section 6.2). A sequestration sounds the most dramatic in a report – and is the one that most reliably disappears again.

The two lowest levels of the lumbar spine, referred to as L4/L5 and L5/S1, are affected most often. That is where load is greatest and mobility highest.

2.4 Why it hurts – pressure is only half the answer

The obvious explanation runs: the tissue presses on the nerve, the nerve reports pain. That is true – but it does not explain everything. There are many people with clear pressure on a nerve root and no symptoms at all. And there are people with severe leg pain and a barely visible herniation.

The missing piece is inflammation. In a healthy disc the interior is largely shielded: it has hardly any blood vessels and little contact with the immune system. (As degeneration progresses that shielding weakens – vessels and fine nerve fibres then grow into the fibrous ring.) Once disc tissue moves outwards, it comes into contact with blood vessels and immune cells. An inflammatory reaction develops around the nerve root, and an inflamed nerve is sensitive: it reports pain even when it is only slightly stretched or moved [4].

This is not an academic nicety but the explanation for two observations that otherwise remain puzzling. First, pain often subsides long before anything has grown smaller on the image – the inflammation settles, the pressure remains for the time being. Second, that same inflammatory reaction is probably also the route by which the escaped tissue is broken down again. What causes the pain also does the clearing up in the end.

2.5 How a herniation arises – and what does not cause it

The common notion runs: one wrong lift, and the disc is out. Yet most people cannot name any such event at all. The pain often begins without any particular trigger, sometimes on getting up, sometimes after a harmless movement.

The reason is that the prehistory is long. The fibrous ring changes over years: the disc loses water, becomes flatter, fine tears appear. These changes are part of normal ageing, and how pronounced they are is to a surprisingly large extent inherited. Studies of identical and non-identical twins showed that genetic make-up and age explain the state of the discs considerably better than physical load at work or in sport [2].

That is a relieving message: anyone who develops a herniated disc has as a rule done nothing wrong. The movement during which it happened was usually just the last in a long series – not the cause.

Known accompanying circumstances do exist. Smoking, excess weight and very long periods of sitting without change are considered unfavourable, as is generally low physical capacity. None of these is a switch that triggers the herniation.

2.6 A great many people have one without noticing

This is the finding that puts the diagnosis into perspective more than any other. A large review summarised studies in which people without any back complaints were placed in the scanner – and counted what was found on their images [1]:

Read the third row again: almost one in three symptom-free 20-year-olds has a finding that appears in the report as a protrusion. Among the 80-year-olds it is more than four in ten – and none of these people had pain.

Does that mean a scan says nothing at all? It does not go that far, and a more recent study shows fairly precisely where the limit lies. In more than 1,500 people it looked not at the absolute finding but at the deviation from the age-expected value: how worn are the discs compared with what is usual at that age? Those with markedly more degeneration than expected for their age had persisting low back pain more often – roughly twice as often as people with an age-typical finding [52]. That concerns the first of the two pictures from section 2.2, not nerve root irritation.

And still it does not change the conclusion. The same work sets out how well the scan tells, in the individual case, whether someone is in pain: barely better than guessing. The deviation was not reliably related to pain intensity, and because everyone was examined only once, it remains open which came first – the degeneration or the pain. So for a group: above-average degeneration goes together with persisting low back pain more often. For the individual person holding a report, what is written above still stands.

What follows from this: a disc finding on an image is, in itself, not an explanation for symptoms. It becomes a diagnosis only when it matches what the person describes and what the physical examination shows. Image and symptoms have to fit together – the image alone decides nothing.

3. What a herniated disc feels like

3.1 The leading symptom: the leg hurts more than the back

When a nerve root in the lower back is irritated, the pain follows the course of that nerve: from the buttock across the back or outer side of the thigh, on into the calf, often as far as the foot. In everyday speech this is called sciatica – an everyday word that is not very precise. Professional language separates two things, and the distinction is useful [4]:

• Radicular pain is the radiating pain itself, caused by irritation and inflammation of a nerve root ("radix" means root).
• Radiculopathy is the term only once a measurable loss of nerve function is added: a diminished reflex, a sensory disturbance in a particular strip, a loss of strength.

Most people with sciatic pain have radicular pain without such deficits – the more favourable starting position. How common these symptoms are at all is hard to capture in a single figure: depending on how narrowly the term is defined, the estimates in the studies differ widely [3].

The most useful feature is the ratio: typically, leg pain is stronger than back pain. Someone who complains mainly about the back and mentions a pulling sensation in the buttock as an aside is unlikely to have a relevant herniation. Someone who says "the back is not the problem at all, it is the leg" is describing exactly the right picture. This ratio is not obligatory, though: it makes nerve root irritation more likely, it does not prove it – and where it is absent, irritation is not ruled out.

Also typical:

• The pain reaches below the knee. That holds for the two commonest levels, L5 and S1. With the rarer upper roots L3 and L4 it may stop in the thigh or at the knee. Overall, though, pain that does not reach below the knee comes more often from other structures.
• It briefly worsens with coughing, sneezing or straining. This is a useful clue, because pressure in the spinal canal rises during those.
• Sitting is often the most uncomfortable, walking sometimes better than standing.
• The pain has a different quality from muscle pain: burning, electric, pulling, "like a cable".

3.2 Numbness, tingling, loss of strength

A nerve root carries sensation from the skin and commands to muscles. If it is impaired, both can be affected:

• Sensory disturbances – tingling, pins and needles, numbness or a furry feeling in a clearly bounded strip of the leg. Unpleasant, but not in themselves alarming.
• Loss of strength – for example difficulty standing on tiptoe, loading the heel or lifting the foot. When the foot drags along the ground while walking, this is called foot drop.

The distinction matters. Numbness may be observed calmly – provided it stays confined to a limited strip of the leg, does not increase, and does not involve the saddle area (see section 4). Weakness that is new or increasing should be assessed medically without delay – not as a night-time emergency, but not in three weeks' time either. Section 4 returns to this distinction, and section 9.2 follows it up in connection with the question of surgery.

3.3 What each level does

The pattern of symptoms usually reveals which root is affected. For those concerned this is interesting mainly because it shows that the examination is not guesswork:

About nine out of ten herniations sit at the two lowest levels, L4/L5 and L5/S1 [4]; there the root affected is usually L5 or S1 respectively. The levels above are considerably rarer.

3.4 What typically does not belong to it

Some things are attributed to a herniated disc but do not fit it:

• Pain in both legs at the same time is unusual. It has other causes – or it is a warning sign (see below).
• Wandering pain, on the left today and the right tomorrow, argues against a single irritated root.
• Pure low back pain without leg pain does not point to meaningful irritation of a nerve root, even if an image shows a herniation – it belongs to the first of the two pictures from section 2.2. That does not mean the disc never has anything to do with it – only that this can hardly be established in the individual case: in the great majority of back pain, no single structure can be reliably identified as the source of the pain [5]. Our article on back pain covers this in detail.
• Clicking or locking in the back is not a sign that "something has jumped out".

4. The warning signs – when it is urgent

By far the largest part of herniated discs is unpleasant but not dangerous. There is, however, one rare emergency: cauda equina syndrome. The name means "horse's tail" and refers to the bundle of nerve roots running in the spinal canal below the spinal cord. If this bundle is severely compressed, bladder, bowel and sensation in the saddle area can be permanently damaged – within hours to a few days.

Go to the emergency department immediately – do not wait, do not leave it until tomorrow:

• You can no longer hold your urine, or no longer pass it; the bladder feels full but nothing comes.
• You no longer feel the bladder filling, or no longer feel the urine as you pass it.
• Stool passes without you noticing, or the sphincter feels powerless.
• Numbness in the area that rests on a saddle – perineum, genitals, inner thighs.
• New severe pain or weakness in both legs.
• New disturbances of sexual sensation.

These signs are described consistently in guidelines and are used worldwide for initial triage [12]. It is a matter of time: the earlier the pressure is relieved, the better the prospect that bladder and bowel function return completely.

For reassurance – and this matters just as much: cauda equina syndrome is rare. A systematic review estimates the frequency at roughly 0.3 to 0.5 cases per 100,000 people per year [13]. The vast majority of people with sciatica do not have it and never will. The list is there so that you react correctly in the rare case – not so that you check yourself every night.

Have assessed medically within a few days, but not as an emergency:

• Weakness in the leg that is new or increasing – especially when the foot drags while walking.
• Pain that is unbearable despite medication and makes sleep impossible.
• Fever, unintended weight loss, a history of cancer or a recent serious infection – together with new back pain.
• A fall or accident as the trigger, particularly with known osteoporosis.

5. How the diagnosis is made

5.1 The conversation contributes most

That sounds old-fashioned, but it is so: the most important clues come from the account. Where exactly is the pain, how far does it reach, what does it feel like, what makes it stronger, what weaker, how did it begin, how has it changed – and are there sensory disturbances or weakness.

Leg pain that reaches below the knee, increases on coughing and follows a particular strip is already a strong clue. Add a matching sensory disturbance and the picture is usually clear.

5.2 The physical examination – and what the straight leg raise really shows

Sensation, strength and reflexes are examined in both legs, along with the mobility of the spine and the movements that provoke or ease the pain.

The best-known test is the straight leg raise (also called the Lasègue test): you lie on your back and the straightened leg is slowly lifted. This tensions the nerve root. If the familiar leg pain appears, the test counts as positive.

Two careful reviews have examined how much it tells us, and both say the same: the test is sensitive but not specific [6], [7]. Sensitive means: someone who really does have a herniation almost always shows a positive test – so a negative test argues against one. Not specific means: many people without a herniation also react positively, so a positive test alone proves nothing.

Considerably more informative is the crossed version: if the healthy leg is lifted and pain shoots into the affected leg, that argues strongly for nerve root irritation [7]. This test is rarely positive – when it is, it carries weight.

In practice this means: no single test decides. The diagnosis emerges from the overall picture of history, pain distribution, sensation, strength and reflexes.

5.3 When an MRI is needed

Magnetic resonance imaging shows discs and nerve roots very precisely. The question is not whether it shows something – it almost always does – but whether the result changes the treatment.

Guidelines agree here [10], [11]. A scan is indicated when:

• warning signs are present (see section 4) – then immediately;
• surgery or a targeted injection is seriously being considered – usually after six to eight weeks without sufficient improvement;
• another cause is suspected, such as infection or tumour.

Conversely: in the first weeks of a typical nerve root irritation without warning signs, an image changes nothing. The treatment is the same whether the herniation is large or small.

5.4 Why a scan taken too early can do harm

This is the uncomfortable part. Imaging is not neutral – it has side effects, even when it does not irradiate.

A review of several studies compared people with back complaints who had an early scan with those who did not. Those who were X-rayed or scanned had no better outcomes for pain and function afterwards [8]. A later analysis found in addition that early imaging went along with higher costs, more further investigations and longer absence from work [9].

The reason is obvious once section 2.6 is in mind: a scan finds something in almost everyone. Those findings then appear in the report, get read, cause worry – and worry changes behaviour. Someone who believes their spine is damaged moves more cautiously, protects it more and recovers more slowly.

This is not an argument against scans, but for the right moment. When a scan influences the decision – before surgery, for instance – it is indispensable. When it does not influence the decision, it costs money and creates unease.

6. The course – the most important message in this text

6.1 Most people get better, and without surgery

The symptoms of a herniated disc are often severe in the first days and weeks. Then things improve for the great majority. Reviews consistently describe leg pain improving markedly or disappearing within six to twelve weeks in most of those affected [4], [36].

The oldest and in this respect still instructive example is a Norwegian study from 1983: people with a herniated disc were randomly allocated to surgery or no surgery and followed for ten years. After one year the operated group was doing better. After four years and after ten years no meaningful difference between the groups could be found [16]. This pattern – faster, but not lastingly better – has repeated itself in every later study.

6.2 The herniation regresses – by itself

This surprises most people the most. Escaped disc tissue does not simply stay there. The body breaks it down: water is withdrawn, immune cells clear it away, the tissue shrinks.

A review of studies in which people were treated without surgery and re-examined later summarised how often a herniation regresses – broken down by the stages from section 2.3 [14]:

The order looks the wrong way round but has a good explanation: the further out the tissue has come, the more contact it has with blood vessels and immune cells – and what comes into contact gets cleared away. So the finding that sounds most alarming in the report has the best prospects.

An important qualification: these figures describe what happens on images, not how people feel. The two do not move in step – as the next section shows.

6.3 What the follow-up scan after a year says about how you feel: little

This study is among the most instructive in the whole field. People with sciatica due to a herniated disc were scanned again one year after treatment began. The images of those who were doing well were then compared with the images of those who were not.

The result: a herniation was still visible in 35 per cent of those with a favourable course – and in 33 per cent of those with an unfavourable one. Practically no difference: whether a herniation was still visible on the scan did not separate favourable from unfavourable courses in this study [15].

What that means for you: a follow-up scan "just to be sure" once you are feeling better is superfluous. And a herniation still visible while symptoms are subsiding is no cause for concern – it is the normal case.

6.4 For whom it takes longer

Not everyone recovers quickly. A large observational study of more than 600 people who consulted primary care for leg and back pain followed the course over one year. About half were doing well, while a substantial proportion still had symptoms after twelve months [17].

The course tended to be less favourable in people with severe symptoms at the outset, a long delay before the first treatment, other coexisting pain problems, and marked worry about the back. The last point is notable because it can be influenced – see Cognitive Functional Therapy.

To be honest: "most people get better" is of little help to someone who has been in pain for six months. There are separate answers for that situation – see section 9.4.

7. The first weeks: what actually helps

7.1 Not to bed – this is well studied

For decades the standard advice for sciatica was two weeks of bed rest. That advice was tested, and properly so.

In a Dutch study, people with fresh sciatica were randomly allocated either to two weeks of bed rest or to moving as much as the pain allowed. After two weeks and after twelve weeks there was no difference between the groups in pain, function or ability to work [18]. A Cochrane review – these are particularly carefully conducted summaries of all the studies on one question – reached the same conclusion: bed rest is no better than staying active, and in some respects worse [19].

That does not mean you have to torment yourself in the first days. If lying down is the only bearable position, then lie down – but as respite in between, not as treatment. As soon as it is possible, movement helps: short distances, frequently, in a dose you do not pay for the next day.

7.2 Positions that take the load off

In the acute phase there are usually positions that are far more comfortable than others. Which ones is individual – so it is worth trying them out deliberately in the first days:

• Supported-leg lying: on your back, lower legs on a chair or block, hips and knees at roughly right angles. For many the single most relieving position.
• Lying on your front, or propped on your forearms. In some people the pain retreats from the leg towards the back in this position – a good sign (see section 8.2).
• Side lying with a pillow between the knees.
• Walking is more bearable than standing or sitting for many people. If that is the case for you, use it.

For sitting, a higher seat and support in the small of the back help. Long car journeys are often the worst part of this phase – plan breaks.

7.3 Medication – what it does and what it does not

This part is discussed with your doctor; what follows is what the studies show, so that you can place the recommendation in context.

• Anti-inflammatory painkillers (ibuprofen, diclofenac and relatives) are the usual first choice. For spinal pain in general – that is, back and neck pain – their effect is real but small: in a large review six people had to be treated for one to gain a benefit they experienced as meaningful [22]. That figure does not come from studies of sciatica, however. Specifically for sciatica, a Cochrane review found no reliable advantage over dummy medication [21].
• Nerve pain medicines such as pregabalin were long used for sciatica. A careful placebo-controlled trial showed that leg pain did not improve more than under dummy medication, while side effects – above all dizziness – were more frequent [23].
• What guidelines advise against. For sciatica the British guideline explicitly recommends not using nerve pain medication of the gabapentin or pregabalin type, nor other antiepileptics, oral corticosteroids or benzodiazepine-type sedatives [11]. A targeted injection at the nerve root, by contrast, may be considered for acute severe sciatica – see the next section.
• Overall, the record of medication in sciatica is sobering. A review of all the drug classes in question found small effects at best and a thin evidence base [20].

This is not an argument against taking painkillers. In the acute phase the point is to be able to sleep and move at all – and for that they are often necessary. It is an argument against expecting them to be the solution.

7.4 The injection at the nerve root

For severe pain, corticosteroid can be injected close to the irritated nerve root (technical term: epidural injection). The reasoning fits section 2.4: if a large part of the pain comes from inflammation, an anti-inflammatory should work on the spot.

The evidence is clear – and more modest than many expect. A Cochrane review summarises it: the injection reduces leg pain and disability slightly and in the short term. Over longer periods no advantage remains demonstrable, and a reliable long-term reduction in the rate of surgery is not established [24].

What it is nevertheless good for: bridging. Someone who cannot sleep or exercise for pain sometimes gains through an injection exactly the window that makes the active part of treatment possible in the first place. As a permanent solution, or as a series without visible progress, it is not.

8. Physiotherapy – what it does

8.1 What physiotherapy can do – and what it cannot

Let us start with what it cannot do, because the claim is persistent: no treatment pushes a disc back in. No manual technique, no device, no exercise. Anyone promising that is promising more than is possible.

What physiotherapy can do is this:

• Make sense of it. Clarify whether the symptoms fit a nerve root irritation, which level is involved, whether warning signs are present, and what you may expect. A large part of the burden comes from uncertainty.
• Take the load off. Find positions and movements that reduce pain in this phase – and name the movements that reliably increase it.
• Build up. Increase load step by step, at a pace the nerve goes along with.
• Lead back. Into work, household and sport, with concrete intermediate goals rather than a vague "when it is better".
• Re-measure. Check strength, sensation and capacity over time – which makes progress visible, and makes its absence noticeable.

8.2 When the pain travels back towards the centre

There is one observation that plays an important role in treatment and that you can make yourself. In some people a particular direction of movement – often, though not always, bending backwards – changes where the pain is: it retreats from the lower leg into the thigh, from the thigh into the buttock, from the buttock into the back. Back pain may briefly increase in the process.

This inward migration is called centralisation, and it is a good sign. A follow-up study of people with referred symptoms showed that those in whom the pain could be centralised in this way did considerably better over the following year than those in whom it could not [27].

And the other direction? In daily life it is the more useful feedback, but it wants reading with more care. If the pain spreads markedly further into the leg during or after an exercise and that worsening persists, the exercise should be adapted or left out for the time being. A brief change during a movement that settles again afterwards, by contrast, does not mean damage is being done.

For context: the study cited examined how well the course can be predicted – not whether treatment selected by this rule is more effective [27]. The migration of the pain is thus a good compass, but not a proof.

8.3 Building load step by step

After the acute phase, the aim is to reaccustom the body to what it is supposed to do. The approach is unspectacular and it works:

• Walking as the foundation. Daily, in stages, increasing the distance from week to week. It is the best-tolerated load for an irritated nerve root.
• Regaining directions of movement. First the directions that are comfortable, then cautiously the others too – bending and rotating included. A back that is only ever held straight stays sensitive.
• Practising lifting again. Yes, really. Not immediately and not heavy, but as a goal. Because bending and lifting are part of daily life, and what is never practised stays threatening.
• The rule for dosage: pain during the exercise is allowed as long as it settles again afterwards and the next day is not worse than the one before. Increased radiation into the leg is the limit.

8.4 Strength and fitness – the part that looks ahead

Once acute pain has settled, the goal shifts: away from pain, towards capacity. Trunk and legs are strengthened, endurance is built, the movements of daily life and work are practised.

This is not about a special "back school" or a particular form of exercise. The major review of back pain in the journal The Lancet notes that movement and exercise work without any one method having proved superior [29]. What counts is regularity and sufficient dose. How such training is built up is described in our article on strength training.

A word on sensory disturbance: numbness often recedes more slowly than pain, sometimes over months, and occasionally a small patch stays furry. That is unpleasant, but it is not a sign of persisting damage – and no reason to protect the leg.

8.5 Nerve mobilisation – what to make of neurodynamic techniques

Physiotherapy for sciatica often uses exercises meant to move the nerve itself: the nerve is put under tension at one joint and released at the next, so that it glides within its surroundings without being strongly stretched (a "slider"), or it is gently taken into tension (a "tensioner"). The idea fits section 2.4: an irritated nerve is mechanically sensitive, and gentle movement is meant to lower that sensitivity.

What the pooled evidence shows – and why it wants reading with care. A meta-analysis brought together 20 studies with 877 participants and found marked improvements in pain and disability, whichever technique was used [49]. That sounds impressive. But the same work names the reasons why the figures are likely to be too good: 13 of the 20 studies were at high risk of bias, the results varied widely, and the test for one-sided publication was clearly positive – small studies with a favourable result get published more readily than small studies without one. On top of that, almost all followed people up for only a few weeks.

The most careful single trial is more reserved. It tested whether neurodynamic exercises add anything to an exercise programme. For pain and disability overall, they did not. What improved was only the nerve-related symptoms and the range in the straight-leg-raise test [51]. That fits what one would expect: the technique targets the sensitivity of the nerve, not the overall picture.

How we handle it. Nerve mobilisation is low-risk – no adverse effects were reported across the 20 studies – it is quickly learned and can be continued at home. It is therefore a sensible component when the nerve reacts with mechanical sensitivity. But it is not a treatment in its own right that replaces building capacity, and anyone selling it as the decisive element is going beyond the data.

8.6 What does not work

• Traction, that is pulling the spine apart with a device or weights, has been studied in back pain with and without sciatica. A Cochrane review found little or no effect on pain, function and return to work [28]. The British guideline explicitly advises against it [11].
• Passive applications on their own – heat, ultrasound, electrical currents, massage. Individual people find them pleasant for a while; that they reliably relieve the pain of an irritated nerve root or change the course is not established. Fine as company during a painful phase, too little as treatment. See our article on massage.
• "Putting the disc back in place" does not exist. Manual techniques can temporarily improve mobility and pain; they do not move anything at the disc.
• Permanent protection and support corsets. Both weaken and lengthen the way back.

8.7 What is honestly still open

A qualification belongs here that we do not want to leave out. The evidence specifically for exercise therapy in sciatica is weaker than one would expect. A systematic review of studies comparing advice to stay active or structured exercise programmes with other non-surgical treatments found no clear advantage of one approach over another; the quality of the studies was mostly low [25]. A careful comparison of two active treatment pathways in severe sciatica likewise showed marked improvement in both groups over one year, without one path being clearly superior to the other [26]. A 2026 review of 19 more recent trials of all forms of non-surgical treatment arrives at the same picture: short-term improvements yes, but the trials are designed so differently that it was not even possible to pool them to say which treatment beats which [50].

How should that be read? It does not mean physiotherapy is of no use. It means that no single form of exercise has emerged from the studies so far as the effective one – and that a large part of the improvement comes from the natural course anyway. What is well established: inactivity and bed rest do not help [18], [19], and people who stay active return to daily life sooner. The value of treatment therefore lies less in a particular exercise than in the guidance: making sense of it, dosing it, keeping at it, changing course in time.

9. When surgery makes sense

This is the question most people arrive with. It can be answered – you only have to keep two situations strictly apart.

9.1 The cases that cannot wait

There are situations in which the question is no longer "surgery or not" but "how quickly". They differ in urgency, and that gradation belongs here [10]:

• Cauda equina syndrome (see section 4) is an emergency. Here hours count, and nothing is weighed up.
• Marked or rapidly increasing paralysis – a foot that can no longer be lifted, for instance – needs a surgical assessment very promptly, on the order of days. The next section covers this in detail.
• Pain that remains unbearable despite all measures is a reason for prompt specialist assessment and can justify early surgery. Unlike the first two points, though, it remains a judgement call in the individual case. That said, when someone can neither sleep nor sit nor walk for days on end, waiting is no longer treatment either.

These cases are the smaller part. For all the rest, what follows applies.

9.2 Weakness – here severity and speed decide

Weakness in the leg is more worrying than pain, and rightly so: pain passes, lost strength does not always. But the worry often leads to too broad a conclusion – namely that any weakness calls for prompt surgery. The studies paint a more precise picture, and the distinction is worth making.

First: how severe is the weakness? On examination the strength of individual muscles is tested and graded (professionals call this the MRC scale, from 0 to 5). For understanding, a rougher division is enough:

• Mild weakness. The muscle is noticeably weaker than on the other side but still works against resistance. This is the most common form – in the largest study on the question it applied to 84 out of 100 people with a motor deficit [39].
• Marked paralysis. The muscle just about moves the leg against gravity but withstands no resistance – or it produces nothing at all.

And where does it sit? That depends on the root involved (see section 3.3). Three patterns occur in practice:

• L5 – ankle and big toe dorsiflexors. The foot can no longer be lifted, slaps down or drags; heel walking is no longer possible. This is the familiar "foot drop".
• S1 – the calf muscles. Standing on tiptoe on one leg is no longer possible or only a few times; the push-off is missing when walking.
• L3/L4 – the knee extensor. The knee gives way going down stairs, getting up from a chair only works using the arms.

These three can be checked roughly at home – heel walking, single-leg tiptoe standing, standing up without arms, each compared with the other side. Whatever stands out there should be measured, not estimated.

Mild weakness: no reason to hurry – but a reason to have it measured. Even mild, unchanging weakness should be assessed medically and documented objectively within a few days: to record the baseline, to make the course assessable at all, and to rule out other causes. For the question that follows – "operate promptly?" – the evidence is then clear and reassuring. In the Dutch trial from section 9.3, the 150 participants who also had a motor deficit were analysed separately. The operated group regained strength faster at first, but after six months the difference was already no longer meaningful. After one year, 81 per cent of those operated on and 80 per cent of those not operated on had regained full strength [39]. Mild weakness in itself is therefore not an argument for surgery.

Marked or increasing paralysis: here time counts. Now the picture changes. An observational study of 330 people operated on for acute paralysis compared the timing of the procedure – not a randomised comparison, which is why the best time window remains unsettled. Those operated on within 48 hours recovered considerably better where the paralysis was marked – at discharge, at six weeks and at three months. Where the weakness was mild, timing made no difference [40]. The same work identified two factors that determine the course: how severe the deficit is and how long it has already lasted.

For the commonest of these, foot drop, this was examined specifically. In an analysis of 71 affected people the very same two factors predicted recovery – strength before the procedure and the duration of the palsy. About three in four regained strength, on average within six weeks of surgery [41]. A further study found in addition that foot drop caused by a herniated disc recovers better than foot drop caused by a narrowing of the spinal canal [42] – for our question the more favourable starting point.

The honest qualification. One would like to write at this point: operate promptly for severe paralysis and the strength comes back. It is not that clear-cut. A systematic review of seven studies with 354 people with marked paralysis found complete recovery in 38 per cent after surgery and in 32 per cent without – a difference this evidence base does not support. The authors state explicitly that the available studies cannot answer the question [43].

But that same review also corrects something else: the course of marked paralysis is not as benign as is often assumed. With or without surgery, a substantial proportion is left with something. That is a reason to take it seriously – and none to let it drag on.

What follows in practice?

• Mild, unchanging weakness: have it assessed medically within a few days and the strength recorded objectively, then observe, exercise, re-measure. As long as it does not increase and no other warning signs are present, there is no reason to hurry – and the outlook is good.
• Marked paralysis – the leg can no longer be held against gravity – or weakness that increases from day to day: have it assessed medically within days, not within weeks. Here surgery moves forward, even though its benefit is harder to quantify than for pain.
• In both cases: have strength measured, and measured again after four to six weeks. "It feels weaker" is not a follow-up measure – and neither is "it feels better".

9.3 The heart of the matter: above all, faster

Several large, carefully conducted studies address this question – and they all come to the same result.

The Dutch trial. 283 people with sciatica of six to twelve weeks' duration were randomly allocated either to prompt surgery or to continued non-surgical care. Result: the operated group was considerably faster to become pain-free – on average after about four weeks instead of twelve. After one year, however, the proportion describing themselves as recovered was practically the same in both groups [32]. The two-year follow-up confirmed this [33]. Notably, about a third of those initially treated without surgery opted for the operation during the course – usually because the pain did not settle.

The American SPORT trial. The largest study of its kind. Here too both groups improved markedly; a clear advantage for surgery could not be established in the main analysis because a great many participants switched groups [30]. Observation over eight years showed sustained improvement in both groups [31]. If one instead counts by who actually had surgery, advantages do show over the longer term – but that analysis is no longer a randomised comparison and is correspondingly more open to distortion.

The overall picture. A 2023 meta-analysis brought the available comparisons together. The picture is consistent: the advantage of surgery for leg pain is greatest immediately after the operation, becomes smaller over the months and is no longer meaningful after about a year [35]. An earlier review had reached the same conclusion [36], as had the Cochrane assessment: faster resolution of leg pain in carefully selected people, while the long-term development remains open [37].

Is that head start worth it? The people concerned were asked. An Australian study presented 200 people with sciatica with both paths side by side, including costs, effort and risks. It then asked: by how much would surgery have to reduce your leg pain in addition – over and above the roughly 50% improvement expected without surgery – for the operation to be worth it to you? The middle answer was: by a further 15%. Among those in pain for more than three months it was 10%; 7 in 100 did not want surgery under any circumstances [48].

This matters because it lets the trial figures be placed. At a baseline pain of 7 out of 10, those 15% correspond to a between-group difference of about 1.1 points – and that is precisely the order of magnitude of the short-term advantage of surgery in the meta-analysis [35]. Put differently: the faster course that surgery brings is, in the view of those asked, worth the trouble. The question, however, only covered the first three months – the value of a procedure over a span of years was not asked about.

To sum up. Surgery buys time. It buys it reliably and often impressively: someone with severe leg pain is usually considerably better off within days. Its average advantage, however, becomes smaller over the months and is slight to negligible after about a year. For the great majority, both paths therefore lead to a similar destination – one faster and with operative risk, the other slower and without. "On average" is not the same as "for everyone", though: some people do benefit from the procedure over the longer term, others would not have needed it. Which group someone belongs to cannot be determined in advance.

That makes the decision not a purely medical question but also a personal one. How much pain can be borne? How long can work wait? What is this person's attitude to an operation? A self-employed person with unpaid days off weighs it differently from someone on a secure salary – and both decide correctly.

9.4 When it does not improve after months

An important addition, because things look different here. For a long time the assumption was: whoever gets through the first months should keep waiting. A Canadian trial tested exactly that. It enrolled people whose sciatica had already lasted four to twelve months and allocated them at random to surgery or continued non-surgical treatment.

Result: the operated group had considerably less leg pain as early as six weeks, and that advantage persisted throughout the year [34].

The conclusion: if leg pain is still severe after four to twelve months and non-surgical treatment has been exhausted, surgery can produce the better result over the following year than continuing to wait. A conversation about the procedure is then appropriate – not as failure, but as the next sensible step.

With one condition. The trial enrolled carefully selected people: with an MRI-confirmed herniation, persisting radicular symptoms and non-surgical treatment already carried out. Clinical findings and image therefore have to match unambiguously (see section 9.7). Where they do not, the result cannot be transferred.

9.5 What surgery does not promise

The usual operation is called microdiscectomy: through a small approach, the escaped tissue pressing on the nerve root is removed. The disc itself is neither replaced nor repaired – it stays as it is, just without the offending piece.

From this follows what the operation can and cannot do:

• Leg pain responds well. That is the strength of the operation.
• Back pain responds less reliably. Anyone whose main problem is low back pain should expect little from disc surgery.
• Sensory disturbance and weakness often recede, but slowly and not always completely. The longer and the more severely a root has suffered, the less certain.
• The disc is not "repaired". The degeneration at that level remains.

9.6 Risks and recurrence

Microdiscectomy is regarded as a safe procedure, but not a risk-free one. Injury to the spinal membrane, infection, bleeding and – rarely – deterioration of nerve function are possible. The exact figures are discussed by the operating clinic.

More common than complications is recurrence: a new herniation at the same disc. A review gives rates of roughly 5 to 15 in 100, depending on the study [38]. That is no argument against surgery, but it belongs in the balance – and it is a reason not to leave the time afterwards unused.

9.7 A decision aid in four questions

If you are facing the choice, these four questions help:

• Are there warning signs or marked paralysis? Then it is not weighing up that decides, but urgency – see section 4 and section 9.2.
• Is it mainly the leg pain? If so, surgery is an effective tool. If it is mainly the back, rather not.
• Does the image match the symptoms? The herniation has to be on the right side, at the right level and at the right root. If it is not, surgery will not solve the problem.
• How long has it lasted, and what has been tried? In the first six to eight weeks waiting is almost always worthwhile. After months of unchanged symptoms the calculation shifts [34].

10. After the operation

Many people expect strict prohibitions – no bending, no lifting, no sitting. The evidence does not support that. The Cochrane review on rehabilitation after disc surgery arrives at three usable statements [44]:

• Exercise programmes starting about four to six weeks after the operation lead to somewhat less pain and better function than no treatment.
• More intensive programmes work somewhat better than very cautious ones.
• There is no evidence that people need to restrict their activities after a first disc operation – and no indication that early exercise increases the rate of repeat herniation.

A realistic sequence looks like this: in the first days and weeks, walk a lot, change position often, do not sit for long. From around the fourth to sixth week the actual build-up begins – strength for trunk and legs, endurance, then the movements of daily life and work. Anyone doing physically heavy work needs longer than someone at a desk, and the way there is practised, not waited for.

The operating clinic's instructions always take precedence. It knows the details of the procedure – if it says something different from this text, its instructions apply.

11. Herniated disc in the neck

The same thing happens higher up, then with pain in the neck that travels across the shoulder into the arm and as far as the fingers, often with tingling or numbness. Professionally this is called cervical radiculopathy.

The good news is similar. Here too the majority improve without surgery. A Dutch trial compared three approaches in recently developed neck-and-arm symptoms: a collar with rest, physiotherapy with home exercises, or watchful waiting. In the first six weeks both the collar and the physiotherapy brought faster relief of neck and arm pain than waiting. After six months all three groups were level [45].

That trial stands alone, however – it is the only comparison of its kind and by now an older one. A collar is therefore not a general recommendation, and prolonged immobilisation still less so. What can be drawn from it is a direction, not a prescription: in the first weeks treatment can relieve symptoms sooner, while it changes little about the result after six months. And here too there are urgent signs. Seek assessment immediately if, in addition to the arm symptoms, unsteadiness of gait appears, the hands become clumsy (buttons, keys), both arms are affected, or bladder and bowel change – this can point to involvement of the spinal cord itself and is treated differently.

12. What you can do yourself

Six things that influence the course and are in your hands:

• Keep moving, in a bearable dose. The most important point, and the best established [18], [19].
• Watch the direction. If the pain repeatedly retreats out of the leg towards the back, that is a favourable sign [27]. If an exercise spreads it further into the leg and it stays that way, the exercise should be adapted.
• Take sleep seriously. Poor sleep lowers the pain threshold. If pain destroys sleep, that needs discussing – painkillers exist for that among other reasons.
• Do not wait for the follow-up scan. How you feel is the better measure of progress than any image [15].
• Give up smoking if you smoke. Smoking impairs the supply to the disc and is regarded as unfavourable for the course.
• Get stronger once the acute pain has gone. Strength and endurance raise your general capacity and can make future episodes of back pain less frequent. Whether they specifically prevent another disc herniation is not established.

And a word about fear, because it is so often involved: the worry of doing fresh damage with a wrong movement is understandable – and it has a measurable effect on the course [17]. Your spine is not a fragile structure. It has held you upright for decades and will go on doing so.

13. Where, how often and for how long treatment takes place

In Switzerland a medical prescription covers nine sessions [46]. For a herniated disc that is enough in many cases for the first stage: making sense of it, taking the load off, starting the build-up, setting up the home programme. With persisting symptoms or after an operation, a second prescription follows.

Appointments are closer together at the start, because much is being adjusted and uncertainty is high. Later they become less frequent, and the home programme carries more weight.

The decisive point is the same as always: what happens between appointments is what counts. Ten minutes on six days achieve more than an hour in the practice. The session is the steering, not the treatment.

And a criterion for the interim review: after four to six weeks something should have moved – less leg pain, more walking distance, more capacity, better sleep. If nothing moves, we change the approach or recommend further assessment. What is not sensible is carrying on unchanged because there are sessions left.

14. Eight common misunderstandings

"The disc has slipped out and has to go back in."
The disc does not slip; it is firmly fused to the vertebral bodies. What has come out is a piece of disc tissue from its interior. It cannot be pushed back – but it can be broken down, and the body usually does that itself [14].

"A herniation on the scan explains my pain."
Not necessarily. Almost one in three symptom-free 20-year-olds has a disc protrusion on the scan, and more than four in ten of the 80-year-olds [1]. Only the agreement of image, history and examination makes a diagnosis.

"The bigger the herniation, the worse."
Size says little about pain and little about the course. Large, extruded herniations are in fact the ones that regress most reliably [14].

"I have to rest until it is gone."
Bed rest has been tested and does no better than staying active [18], [19]. Those who move return to daily life sooner.

"Operating early means healing better."
Operating early means becoming pain-free sooner. After a year the difference from the non-operated group is no longer meaningful [32], [35]. The exceptions are the urgent cases and a course lasting several months [34].

"Without an operation I will be left with nerve damage."
For an ordinary herniated disc without warning signs this is not established. The urgent situations are named so clearly [12] precisely so that the rest can be observed calmly.

"I need a follow-up MRI to know whether it has healed."
After one year the images of those with a good and those with a poor course looked practically identical [15]. The scan does not answer the question you are asking it.

"After an operation I must never lift anything heavy again."
There is no evidence that activities have to be restricted after a first disc operation [44]. The build-up is gradual – but the goal is full daily life, not a life of prohibitions.

15. When to get in touch

Go to the emergency department immediately:

• Newly unable to pass urine, unable to hold urine or stool, or no longer feeling the bladder fill. (Frequent urgency on its own, or constipation, does not belong here – those usually have harmless causes.)
• Numbness in the saddle area – perineum, genitals, inner thighs.
• New severe symptoms or weakness in both legs.

Have assessed medically within a few days:

• New or increasing weakness in the leg, especially if the foot drags.
• Unbearable pain despite medication, no sleep at night.
• Fever, unintended weight loss, a history of cancer.
• Symptoms after a fall or accident, particularly with known osteoporosis.
• Neck and arm symptoms together with unsteady gait or clumsy hands.

Raise in physiotherapy:

• Leg pain is not improving after four to six weeks.
• The pain travels further out into the leg instead of towards the back.
• You no longer trust yourself with certain movements and avoid them in daily life.
• You are facing the question of whether to have surgery and want to sort out the arguments.
• You have had surgery and do not know how to structure the build-up.
• You are reaching the limits of work or sport and need a plan for the way back.

What to expect in our practice: first the assessment – do the symptoms fit a nerve root irritation, which level is involved, are there warning signs. Then an honest account of the expected course, because that usually reduces the burden most. Then the work: relieving positions for the acute phase, a home programme with clear dosing, step-by-step build-up of load with goals taken from your daily life. We measure strength, sensation and capacity over time and check after four to six weeks whether things are moving. If the question of surgery is in the room, we prepare it with you – the decision is made together with your doctor, but it comes more easily when it is clear what the operation can and cannot achieve.

16. In summary

A herniated disc is usually not lasting damage but an event with a good outlook. The pain does not arise from pressure alone but to a large extent from inflammation around the nerve root – and that settles.

Images mislead. A herniation is found in a great many people without any symptoms, and one year after treatment begins the image cannot tell who is doing well and who is not. The body breaks down most of the escaped tissue itself – most reliably when the report sounds most dramatic.

What matters is knowing the rare urgent signs: changes in bladder and bowel, numbness in the saddle area, symptoms in both legs, rapidly increasing paralysis. For everything else: keep moving, do not take to bed, dampen the pain enough to make movement possible, and rebuild load step by step.

Surgery removes the tissue pressing on the root. It works well against leg pain and brings relief sooner – but its average advantage becomes smaller over the months and is usually no longer meaningful after a year. That does not apply to the urgent cases, and it no longer applies when pain has remained severe for four to twelve months: then surgery becomes a good option.

The most useful question is therefore not "is there a herniation?" but: what exactly is limiting me, and what is the next step back? There is almost always an answer to that – and it usually begins with movement.

If you would like to experience how much the further course depends on the decisions of the first weeks: our learning game Rückenwerk lets you make exactly those decisions over twelve weeks and shows where they lead.

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All Digital Object Identifiers (DOIs) were verified individually against the Crossref register. The links in the reference list lead via the DOI service to the publishers' pages. Some of these are located outside Switzerland and the EU. When you click them, your IP address is transmitted to the respective provider – this does not happen on our own site.

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