Cauda equina syndrome: recognise it, refer it, rehabilitate it

The site already devotes whole articles to the conditions of which this syndrome is the dreaded complication: sciatica from disc herniation, then degenerative lumbar stenosis, then non-specific low back pain, and femoral neuralgia. In each of those pages, cauda equina syndrome takes up three lines in a box. This page deals with the syndrome itself: how to recognise it before retention, how to ask the questions everybody skips over, where to refer and how fast, and what becomes of the patient afterwards. It is the surgical emergency of the spine, the one whose delay is paid for in permanent sphincter and sexual sequelae.

What is cauda equina syndrome, and why is it the emergency of the spine?

Below the cord, the lumbar and sacral roots run down as a free bundle in the canal. They carry the control of the bladder, of the anal sphincter, of genital sensation and of lower limb motor function. A conflict that compresses them all together therefore does not produce one more pain: it produces a loss of functions, some of which do not come back.

The spinal cord ends at about L1 or L2. Below that, the spinal canal contains a bundle of lumbar and sacral nerve roots that run freely in the dural sac before exiting at their own level: that is the cauda equina. These roots carry the innervation of the lower limbs, but also, through the sacral roots S2 to S4, the innervation of the bladder, the anorectum and the genitalia. Compression wide enough to involve them together produces cauda equina syndrome.

The commonest cause is a large central or paracentral disc herniation, most often at L4-L5 or L5-S1, which abruptly fills the canal. This is the point at which this article meets the one devoted to sciatica from lumbar disc herniation : the same lesion that usually produces radicular pain in a single territory can, if it is central and massive, compress the whole bundle. The other causes are also met in practice: advanced degenerative lumbar stenosis, spondylolisthesis, intracanal tumour or metastasis, epidural abscess, spontaneous or anticoagulant-related epidural haematoma, trauma.56

The syndrome is rare. A population study conducted across the whole of Scotland, which recorded for one year every patient operated on as an emergency for degenerative compression of the cauda equina, found 149 cases in 5.4 million inhabitants, that is a crude incidence of 2.7 per 100,000 adults per year.2 That work brings two less expected lessons. First, the incidence is higher than had been thought: earlier European estimates hovered around 0.3 to 0.6 per 100,000, that is at least four times lower. Second, the disease preferentially affects young adults, more often women, with a peak of 7.2 per 100,000 in women aged 30 to 39. The typical patient is therefore not the elderly person with osteoarthritis: it is someone in the middle of their working life, exactly the profile that comes to a community practice with low back pain or sciatica.

A two-stage classification that governs the prognosis

The literature long suffered from the absence of a shared definition. A review of 212 articles published over twenty-one years counted seventeen different definitions of the syndrome.9 It is a practical problem and not merely an academic one: two studies announcing opposite results on surgical timing may simply not be talking about the same patients.

The classification that has taken hold, adopted by the standards of the British association of spine surgeons, is a simple dichotomy.910

This distinction is not a refinement of classification: it is the main clinical message of this article. A study that followed 46 patients for a mean of 43 months after surgery, using validated questionnaires, shows that those who had reached the stage of retention had significantly worse results for bladder, bowel and sexual function than those operated on at the incomplete stage.11 In other words, most of the prognosis is decided before hospital, in the interval between the first functional disturbances and the first person who takes them seriously.

Which signs should alert you, and in what order do they appear?

The classic descriptions list the signs as a list, which suggests they arrive together. In practice they arrive as a cascade, and the first of the cascade are the ones nobody mentions spontaneously.

A Dutch study recorded the prevalence of each symptom at the time of presentation in 75 patients operated on for cauda equina syndrome from disc herniation. Sciatica was present in 97 % of them, a change in saddle sensation in 93 %, voiding dysfunction in 92 %, defecation dysfunction in 74 %.12 The most telling figure in that study is elsewhere: only 26 patients out of 75 had been asked about their sexual function, and 25 of those had a disturbance. The symptom was not rare, it was not sought.

The mean duration of complaints before presentation was 84 hours, with a median of 48 hours.12 That means half of those patients had already had symptoms for two days when they arrived at hospital, before the operative-delay clock even started. It is that earlier delay, the one before hospital, over which a physiotherapist has some hold.

What pain can mask

Two misleading situations recur in the series and deserve to be known.

The first is paradoxical improvement in pain. A root compressed to the point of losing conduction stops hurting. A patient whose severe sciatica settles markedly within a few hours while weakness or numbness appears is not getting better.

The second is atypical presentation. A published case describes a patient with bilateral weakness, perineal numbness and sphincter disturbance, but also clonus, normally a sign of a central lesion and not of root compression. The presence of that sign cast doubt on the diagnosis and raised the possibility of an inflammatory or demyelinating condition. The lumbosacral MRI showed a large L5-S1 herniation, decompression was carried out, and the clonus resolved completely after surgery.13 The authors' lesson is explicit: the presence of an unexpected sign must not delay surgery when the rest of the picture is consistent.

How do you ask the awkward questions without skipping over them?

This is the most useful chapter of this article, because it is the only point in the pathway where the physiotherapist truly decides what happens next. Screening is decided by words.

Thirty physiotherapists from a British community musculoskeletal service were interviewed about their practice in screening for cauda equina syndrome. All of them routinely asked the questions about bladder, bowel and saddle anaesthesia. Only nine routinely asked the questions about sexual function. Half reported discomfort in raising that area. Fewer than half framed the question before asking it, and five participants out of thirty brought together the four dimensions of a proper enquiry.14

This work is valuable because it does not say that physiotherapists do not know what to ask: it says that they do know and that they skip it anyway, on the single most intimate dimension. The authors also note barriers of language and culture, and the fact that the way of asking these questions had never been studied.

Frame it first, in one sentence

Framing is the dimension most often left out and the least costly to put right. It consists of saying, before asking anything at all, why you are asking. A wording that works:

That sentence does three things at once: it announces the register, it depersonalises the question, and it explains what is at stake without alarming. It also gives the patient permission to report a “detail” they would have kept quiet.

The wordings, area by area

The common principle is to avoid both jargon and euphemism. “Do you have any sphincter disturbance?” means nothing to a patient. “Everything all right in that department?” invites a yes.

And if the patient has already left?

Screening is not a snapshot. A disc herniation can complete itself between two sessions. The approach recommended in the literature written for physiotherapists is to back up the enquiry with an explicit instruction handed to the patient: tell them which signs should take them to the emergency department without waiting for the next appointment, and tell them in plain words rather than in medical terms.16 A service evaluation covering 231 suspected patients seen in an outpatient setting shows that this combination, an explicit safety net and an established chain of communication, is what makes it possible to refer urgently only the minority who need it without missing the others: 21 % were referred to the emergency department, and seven compressions were confirmed on MRI.17

What are the clinical signs really worth, and should you trust the bladder scan?

A clinician who knows the real value of their signs stops expecting from them what they do not give. No sign of this syndrome allows it to be ruled out, and that is precisely what must govern practice.

The largest published prospective evaluation covered 260 patients referred with suspected cauda equina syndrome to a tertiary spinal unit, all examined by spine surgeons then measured by bladder scan before MRI.18 Its results are harsh on clinical examination in isolation. Bilateral sciatica, the classic red flag, has a sensitivity of 32.4 % and a positive predictive value of 17.2 %. It therefore misses two thirds of cases, and when it is present it is wrong five times out of six.

Other work points the same way. A review of 57 patients referred with suspicion, of whom 13 had confirmed compression, concludes that digital rectal examination provides no discrimination : accuracy of 51 %, diagnostic odds ratio of 1.42, with no significant relationship between the number of positive clinical signs and the MRI result.19 Another series identified no clinical sign predictive of compression on MRI.20 A review of 250 referrals finds 13 % of cases confirmed, with no difference in clinical presentation between true and false positives, and concludes that imaging, not clinical triage, is the limiting step.21

The post-void residual: useful, but not exclusive

Measuring the residual by bladder ultrasound is the only item on this list that clearly improves performance. With a threshold of 200 ml, the prospective cohort finds a sensitivity of 94.1 % and a negative predictive value of 98.7 %.18 A meta-analysis of seven studies and 734 patients compared thresholds of 100, 200, 300 and 500 ml, and confirms that 200 ml offers the best accuracy, with a sensitivity of 82 % and a specificity of 65 %.22 The authors of that meta-analysis attach an explicit caveat to their conclusion: the residual must not be used in isolation, nor as a rule-out tool.

That caveat has been put to the test. A series of 50 medicolegal files of confirmed syndromes looked for those who had had a bladder scan: 26 had, and in 13 of them, that is half, the residual was 200 ml or less while the diagnosis was clinical and radiological.23 All thirteen were incomplete forms, and all were operated on as emergencies. The authors' conclusion deserves quoting as it stands in a patient's record: a residual of 200 ml or less reduces the probability of the syndrome but does not rule it out, and clinical suspicion must always lead to MRI.

Combining the signs, and the score drawn from them

If no sign is sufficient on its own, combining them raises the probability. A Dutch series of 58 suspected cases, of which 8 compressions were confirmed, shows that retention above 500 ml, or the combination of at least two of bilateral sciatica, subjective urinary retention and rectal incontinence, carries an odds ratio of 48.0 for compression on MRI, with a very wide confidence interval of 3.30 to 697.21 that reflects the small sample size.24

That logic was formalised in 2026 in the SuCESS score, built on 259 patients then validated on two independent cohorts totalling 444 patients. Six clinical variables go into it: saddle anaesthesia, reduced perianal sensation, motor deficit, bilateral sciatica, post-void residual and urinary catheterisation. At a threshold of 3 points out of 8, the score reaches a sensitivity and a negative predictive value of 100 %, identifying all 64 confirmed cases, and would have allowed 38.7 % of urgent MRI scans to be deferred.7

When the MRI is normal

The majority of MRI scans requested urgently for suspicion show no compression: more than 80 % in the SuCESS score cohort7, 81 % in the series behind the 19 % confirmed of the systematic review of incidence.3 These patients are not patients seen “for nothing”. One study followed 62 of them and finds high levels of pain, chronicity and disability, with more functional comorbidity than in patients with a positive MRI, and above all no coherent follow-up pathway.26 A more recent series of 922 patients confirms that those who re-attend for the same symptoms after a normal MRI do not go on to develop compression: of 43 patients who came back within the year, none had a genuine syndrome on the second examination.27

These two results complement each other and set out what to do: the initial MRI remains indispensable to decide, and a recent, normal MRI, in the absence of a new symptom, does not justify repeating the examination but rather organising management of the pain and disability, which is what these patients really need.

What do you actually do when you suspect the syndrome?

The phrase “refer to the family doctor” makes no sense here. What has to be obtained is an MRI and, if it confirms, an operating theatre. That points to a type of facility, not to a correspondent.

Why “the family doctor” is not the right answer

The international red flag framework published by IFOMPT insists on a point that has changed the way we reason: red flags are not switches, they feed clinical reasoning, and most of them have no established diagnostic value taken in isolation.28 But this syndrome is an exception to watchful waiting, because the useful window is measured in hours and the only test that decides is an MRI. Referring to a correspondent who will then have to request the test adds a link where every link costs hours.

Concretely, what you should aim for is an emergency department with access to MRI and a pathway to a spinal surgery team. The British literature documents the weak point in the circuit: in a series of 250 referrals, 73 patients presented without imaging outside working hours, and the test was put off to the next day for 60 of them, that is 82 %.21 The authors argue for 24-hour MRI access in every hospital that has one. That does not depend on the physiotherapist, but it tells them where their referral has the best chance of getting somewhere fast.

Is the 48-hour window an established fact or a convention?

It is the most quoted figure of this syndrome, and the least often read at source. It does not come from a randomised trial, it comes from a meta-analysis of observational studies published in 2000, whose conclusions are more nuanced than the use made of them.

Where the figure comes from

The source is a meta-analysis published in Spine in 2000, which reviewed 104 references, retained 42 meeting its inclusion criteria, and analysed the results of 322 patients operated on for cauda equina syndrome from disc herniation.29 The authors divided the delay into five bands: under 24 hours, 24 to 48 hours, 2 to 10 days, 11 days to one month, more than one month. Two results come out of it, and the second is almost always forgotten.

• There is a significant difference in sensory, motor, urinary and rectal recovery between patients operated on within 48 hours and those operated on later.
• There is no improvement from operating in under 24 hours rather than between 24 and 48 hours. And beyond 48 hours, the authors find no difference between the bands either.

The same work identifies prognostic factors independent of the delay that weigh heavily in practice: pre-existing chronic low back pain is associated with poorer urinary and rectal results, preoperative rectal dysfunction with poorer urinary continence, and increasing age with poorer postoperative sexual function.29

The challenge, and what it is about

Two years later, a review published in the British Journal of Neurosurgery challenges head-on the idea of emergency surgery for everyone. Its arguments are not statistical but pathophysiological and operative: by the time of admission, the chance of recovery may already be lost; removing a large central herniation is considerably harder than a routine discectomy and often requires an extended approach; carried out in degraded conditions, as is frequently the case on call, surgery may add to morbidity instead of reducing it. The authors conclude explicitly that when retention with overflow incontinence is already present at presentation, urgent decompression brings no benefit.30

That position is not marginal, and it sheds light on a finding met everywhere: it is not the stopwatch that governs the prognosis, it is the neurological state at the moment the stopwatch starts.

What the most recent data show

A meta-analysis published in 2026 in The Spine Journal took the question up again across 15 comparative studies and 26,627 adults operated on for a degenerative syndrome, with subgroup analyses planned in advance.1 Its results structure clinical practice far better than the raw 48-hour figure.

The authors' conclusion is a “clinically significant” threshold at around 48 hours from symptom onset, with maximum urgency reserved for patients who retain voluntary voiding.1 That is the exact reversal of the intuition that consists of waiting for retention to be sure of the diagnosis.

Why the figures remain debated

Another meta-analysis, covering 22 studies and 852 patients, illustrates the fragility of the evidence base better than any commentary. It does find far less persistent bladder dysfunction after decompression carried out within 48 hours, but look at the confidence intervals.31

The same phenomenon is found in small series. A Spanish study of 18 patients observes better motor and sphincter recovery in those operated on early, but finds no statistically significant difference, and says so.32 A review published in 2025 in JBJS Reviews sums up the state of the question bluntly: the timing of decompression remains debated, some studies showing no difference between 24 and 48 hours while others insist on immediate intervention.33

What the guidelines make of it today

The institutional position is more clear-cut than the evidence. The standards of the British association of spine surgeons insist on MRI without delay and emergency surgery in the cases that warrant it.10 A 2026 narrative review reports the update of the British national pathway published in 2025, which aims for decompression within 24 hours of confirmation, keeps the bladder scan as an argument in favour of the diagnosis and not as a means of ruling it out, and calls for 24-hour MRI capacity in general hospitals.34

That development does not contradict the nuance of the meta-analyses: it draws the organisational consequence from it. Since the prognosis depends above all on the stage reached at the time of diagnosis, the only variable genuinely modifiable at the scale of a health system is the time it takes to make that diagnosis. It is also the only variable a physiotherapist acts on.

What becomes of the patient after decompression?

This is the part that red flag boxes never mention, and yet it is the part that gives the urgency its meaning. Surgery stops the compression; it does not always restore the functions.

A 2026 meta-analysis covering 16 studies and 987 patients operated on for a degenerative syndrome finds persistent bladder dysfunction in 32.6 % of patients beyond twelve months, with a confidence interval of 23.4 to 41.9 % and marked heterogeneity between studies.8 In those who already had a bladder disturbance before the operation, the raw paired data show persistence in 130 patients out of 278, that is 46.8 %. The authors note that the results are consistently worse in patients admitted in retention than in the incomplete forms, and that the evidence on the effect of surgical delay on long-term bladder outcome remains heterogeneous and inconclusive.

A systematic review published the same year on sexual function gives an even higher figure: the reported prevalences run from 48 to 67 %, with a pooled estimate of 58.4 % sexual dysfunction at a distance.4 The disturbance affects both sexes and is not confined to erectile dysfunction: it includes impairment of arousal, orgasm and satisfaction. The authors note associations with age, with the duration of preoperative bladder dysfunction and with markers of sacral root involvement, perianal numbness and anorectal disturbance, but not with operative delay. Baseline sexual function was almost never documented.

These results agree with those of other cohorts. A meta-analysis of 22 studies and 852 cases finds, at a mean follow-up of 39 months, 43.3 % persistent bladder dysfunction, 31.1 % anorectal dysfunction, 53.3 % sensory deficit, 38.4 % motor weakness and 40.1 % sexual dysfunction.31 An insurance database study comparing 2,362 operated patients with 9,448 matched controls operated on the spine without cauda equina syndrome shows that at five years the risk of bladder dysfunction remains independently increased, with an odds ratio of 1.72 (95 % CI 1.56 to 1.89).36

What patients say they want

Two lessons from the Scottish cohort followed for a mean of 43 months deserve to be known by any physiotherapist who will see these patients.

The first: asked which symptom they would most want treated, 57 % named pain, ahead of all the functional disturbances. Yet only 7 % had been referred to a pain management clinic.11 The second: the psychological impact is major and underestimated. In the same population, 37 % had scores compatible with a risk of depression over the last thirty days and 45 % over the last twelve months, and bladder and anorectal function were the significant predictors of mental quality of life, more so than physical function.37

What rehabilitation for the sequelae, pelvic floor included?

This is the best-documented hole in this file: the needs are massive, the provision is thin, and the level of evidence for the interventions is low. Saying so honestly is better than promising protocols that have not been evaluated.

A British national cohort covering patients operated on between June 2018 and May 2019 measured access to rehabilitation. Inpatient physiotherapy is almost universal: 572 patients out of 610, that is 94 %. Referral to specialist spinal rehabilitation on discharge concerns only 49 patients out of 608, that is 8 %. At one year, residual symptoms remain common: 66 % motor disturbance, 20 % bladder, 17 % anorectal, 13 % sexual. The authors note a marked difference by sex: 27 % of women retain bladder dysfunction against 11 % of men, whereas the rates at presentation were comparable, 84 % and 82 %.38 Their conclusion is that prospective studies of rehabilitation strategies are lacking to guide decisions.

What recovers spontaneously, and when

A Japanese prospective cohort followed 93 patients operated on by posterior decompression, with constipation and urinary symptom questionnaires before the operation then at 1, 3, 6 and 12 months. On admission, 38.1 % had defecation disturbance and 33.3 % urinary disturbance. Surgery improved these symptoms in 30 to 50 % of the patients affected, with a first visible effect as early as one month and improvement continuing up to one year.39

That time course is useful to know for two reasons. It lets you explain to the patient that sphincter recovery is slow and that the absence of progress at three months is not a definitive failure. And it indicates that the useful rehabilitation window extends over at least a year, which is well beyond the durations usually prescribed.

The modalities and their level of evidence

The anorectal side, the best supported

This is the only area in which a clinical trial has been conducted specifically in patients with cauda equina syndrome. Twelve participants, mean age 46, used a transanal irrigation system for ten weeks; ten completed the study. The neurogenic anorectal dysfunction score improved significantly, as did the faecal incontinence score, the constipation score, quality of life and self-rated bowel function, with colonic transit time reduced by 22 %, and no notable adverse effect.40 The authors recommend considering this option in patients in whom the usual methods of bowel management fail.

The sample is small and there is no control group: it is a solid lead, not definitive evidence. It has the merit of existing, which is true of no other modality in this population.

The bladder side

Management of the neurogenic bladder after lumbosacral injury follows a hierarchy of objectives that it is important to understand before proposing anything at all: protect upper urinary tract function first, restore at least partly lower tract function next, improve control, reduce the residual, prevent urinary infection and improve quality of life. The means run from conservative treatment to drug treatment, catheterisation, neuromodulation and surgery, given sequentially according to the situation.41

That framework indicates the physiotherapist's place: it is real but subordinate to urological assessment, and in particular to urodynamic testing where indicated. A study coupling clinical and urodynamic assessment in 43 patients showed that perianal sensation and overall motor weakness were the determinants of bladder function, and that bladder recovery was directly related to the number of days of delay.44 Proposing pelvic floor work without knowing whether the bladder is hypocontractile or overactive risks treating it the wrong way round.

For the day-to-day practice of pelvic floor work itself, the base of competence is that of pelvic and perineal physiotherapy and anorectal rehabilitation, transposed to a neurological population. The site offers courses dedicated to these fields, including anorectal rehabilitation and pelvic floor rehabilitation, as well as a course devoted to triaging neurological disorders in musculoskeletal practice, which is exactly the competence brought to bear at the moment of the screening described above.

How do you recognise the syndrome in a pregnant or postpartum woman?

This subpopulation deserves a chapter for a precise reason: every warning sign is explained away in advance there. Low back pain, urinary disturbance and perineal disturbance belong to the normal picture of pregnancy and of the puerperium, which gives the syndrome the best of covers.

Cauda equina syndrome is rare during pregnancy, and symptomatic disc herniation itself is an uncommon cause of low back pain there.45 But the context is precisely the one in which the peak of incidence was measured: women aged 30 to 39, with an incidence of 7.2 per 100,000 per year, are the population most affected in the Scottish cohort.2

Management does not change, and that is the point to remember: cauda equina syndrome and progressive neurological deficits are absolute surgical indications at any stage of pregnancy. MRI is the investigation of choice, and surgery has been shown to be safe in this population, provided the obstetric environment can manage a fetal complication.45 A published case describes a patient successfully operated on prone at 30 weeks' gestation, who then delivered by planned caesarean section at term.46

In postpartum pelvic floor rehabilitation, vigilance rests on a simple point: a patient referred for postpartum incontinence who has saddle hypoaesthesia, loss of the sensation of needing to go, or a new anorectal disturbance does not belong to the usual protocol until those signs have been explained.

What do real clinical cases teach us?

Three published cases, chosen because they illustrate three different errors in the pathway. None is a reconstruction: these are observations reported in the indexed literature, with their identifiers.

The case that shows what a first-contact practitioner is worth

A 30-year-old woman presents at a chiropractic practice with saddle-distribution sensory loss and urinary retention. She had already been assessed in the emergency department and in radiology 48 hours earlier, and her symptoms had worsened since. After a brief history and examination, the practitioner refers her straight back to the emergency department. Given the rapid progression of the picture and the lumbar MRI already done, decompression is carried out the same day. Low back pain and neurogenic symptoms persisted after the operation, prompting a trial of epidural injections and pelvic floor rehabilitation, with relief described as minimal.42

The case that reminds us an atypical sign must not delay things

A woman presents with bilateral lower limb weakness, perineal numbness and sphincter disturbance, but also clonus, a sign of upper motor neurone lesion that does not belong to the classic picture. The diagnostic doubt led to consideration of an inflammatory or demyelinating cause, and to urgent brain and cervicothoracic MRI, which showed nothing. The lumbosacral MRI showed a large L5-S1 herniation. Decompression was carried out, the compression was significant intraoperatively, the patient recovered completely and the clonus disappeared.13 The authors conclude that the presence of clonus does not rule out the diagnosis, and that surgery must not be deferred while a second condition is sought if the clinical and radiological picture is consistent.

The case that raises the question of the manual procedure

A 38-year-old man with a known lumbar disc herniation develops cauda equina syndrome after a vigorous back massage including spinal manipulation: severe numbness of both lower limbs, inability to walk from bilateral weakness, urinary and faecal incontinence. Imaging shows an L4-L5 herniation migrated into the canal, widely compressing the dural sac. He is operated on as an emergency, with laminectomy, decompression, discectomy and fusion, and recovers walking within a week, along with continence.47

An isolated case does not demonstrate a causal relationship, and the authors themselves call the event extremely rare. What it does indicate is usable: in a patient with a known large disc herniation, the appearance of sacral territory signs after a session, whatever the technique, must be taken seriously immediately and not put down to a commonplace post-treatment reaction.

How do you apply all this in practice?

This chapter condenses the article into an approach that holds up in a busy clinic day, without turning every episode of low back pain into a suspected neurosurgical emergency.

Screening takes ninety seconds

1. Frame it in one sentence: I ask these questions of every patient with back pain, it is rare, it is treated well if caught early.
2. Ask five things : the bladder (starting, sensation of fullness, emptying), the anorectum (sensation of needing to go, control), saddle sensation, genital sensation, motor function and sciatica on both sides.
3. Date every positive answer.
4. Record it, including the negative answers.

This screening is repeated at every session in an at-risk patient, because a herniation can complete itself between two appointments. It does not take the place of the examination, it is added to it.

What to say to the patient before they leave

This instruction works better written than spoken, and the written form also has documentary value. The literature written for physiotherapists insists on this triad: communication, documentation, safety net.16

What the physiotherapist brings after surgery

• Open the subjects the patient does not raise. Pain is the symptom for which these patients most ask for help, and it is rarely treated.11
• Screen for psychological distress. Nearly half of these patients have scores compatible with a risk of depression, correlated with bladder and anorectal disturbance more than with physical disability.37
• Do not conclude too early. Sphincter improvement continues to at least one year.39
• Direct them to what exists : urological assessment and urodynamic testing when the bladder is involved, specific anorectal management, of which transanal irrigation has been the subject of the only clinical trial in this population.40
• Be explicit about the uncertainty. Pelvic floor rehabilitation has not been evaluated in this indication: the patient has a right to know that.

And the question of professional risk

It is on everyone's mind and rarely documented. A scoping review counted, between 2009 and 2021 in the United Kingdom, fifteen claims involving physiotherapists, that is 0.7 % of all claims linked to this syndrome.48 The risk is therefore low in absolute terms. A qualitative study of forty physiotherapists and other people involved shows, on the other hand, that going through proceedings has a lasting effect on the wellbeing and practice of those who experience it, in a context perceived as a culture of blame that discourages sharing and collective learning.15

The practical conclusion is not to protect yourself by referring everyone, which would be unmanageable and pointless since more than 80 % of urgent MRI scans are already negative. It is to do the two things that genuinely protect both patient and practitioner: ask the complete set of questions, and write down what was asked and answered.

Frequently asked questions

Bibliography

Each reference carries its PubMed identifier and its DOI. The metadata were checked against two independent databases, PubMed and CrossRef.

1. Najjar E, Egu C, Akil H, Najjar S, AlAchkar M, Muscogliati R, et al. Reassessing the clock in cauda equina syndrome: a systematic review and meta-analysis of surgical timing and outcomes. Spine J. 2026;26(9):1653-1670. PMID 41991105 · doi:10.1016/j.spinee.2026.04.013
2. Woodfield J, Lammy S, Jamjoom AAB, Fadelalla MAG, Copley PC, Arora M, et al. Demographics of Cauda Equina Syndrome: A Population-Based Incidence Study. Neuroepidemiology. 2022;56(6):460-468. PMID 36315989 · doi:10.1159/000527727
3. Hoeritzauer I, Wood M, Copley PC, Demetriades AK, Woodfield J. What is the incidence of cauda equina syndrome? A systematic review. J Neurosurg Spine. 2020;32(6):832-841. PMID 32059184 · doi:10.3171/2019.12.SPINE19839
4. Najjar E, Trumble C, Nocun W, Muscogliati R, Nematiniaye Masooleh N, Dar A, et al. Sexual dysfunction after cauda equina syndrome: a systematic review of long-term outcomes. Eur Spine J. 2026. PMID 42472710 · doi:10.1007/s00586-026-10170-5
5. Kuris EO, McDonald CL, Palumbo MA, Daniels AH. Evaluation and Management of Cauda Equina Syndrome. Am J Med. 2021;134(12):1483-1489. PMID 34473966 · doi:10.1016/j.amjmed.2021.07.021
6. Vaishya S, Pojskic M, Bedi MS, Oertel J, Sippl C, Robertson S, et al. Cauda equina, conus medullaris and syndromes mimicking sciatic pain: WFNS spine committee recommendations. World Neurosurg X. 2024;22:100274. PMID 38496349 · doi:10.1016/j.wnsx.2024.100274
7. Najjar E, Khan S, Masarwa R, Grevitt MP. The Suspected Cauda Equina Syndrome Score (SuCESS) : development and validation of a clinical triage tool. Bone Joint J. 2026;108-B(3):416-424. PMID 41763246 · doi:10.1302/0301-620X.108B3.BJJ-2025-0986.R2
8. Najjar E, Muscogliati R, Trumble C, Nocun W, Masooleh NN, Lindridge E, et al. Reassessing bladder recovery in cauda equina syndrome: long-term outcomes after surgical decompression:a systematic review and meta-analysis. Spine J. 2026. PMID 42480656 · doi:10.1016/j.spinee.2026.07.005
9. Lavy C, Marks P, Dangas K, Todd N. Cauda equina syndrome-a practical guide to definition and classification. Int Orthop. 2022;46(2):165-169. PMID 34862914 · doi:10.1007/s00264-021-05273-1
10. Germon T, Ahuja S, Casey ATH, Todd NV, Rai A. British Association of Spine Surgeons standards of care for cauda equina syndrome. Spine J. 2015;15(3 Suppl):S2-S4. PMID 25708139 · doi:10.1016/j.spinee.2015.01.006
11. Hazelwood JE, Hoeritzauer I, Pronin S, Demetriades AK. An assessment of patient-reported long-term outcomes following surgery for cauda equina syndrome. Acta Neurochir (Wien). 2019;161(9):1887-1894. PMID 31263950 · doi:10.1007/s00701-019-03973-7
12. Korse NS, Pijpers JA, van Zwet E, Elzevier HW, Vleggeert-Lankamp CLA. Cauda Equina Syndrome: presentation, outcome, and predictors with focus on micturition, defecation, and sexual dysfunction. Eur Spine J. 2017;26(3):894-904. PMID 28102451 · doi:10.1007/s00586-017-4943-8
13. Mirza AB, Akhbari M, Lavrador JP, Maratos EC. Atypical Cauda Equina Syndrome with Lower Limb Clonus: A Literature Review and Case Report. World Neurosurg. 2020;134:507-509. PMID 31715419 · doi:10.1016/j.wneu.2019.10.198
14. Kimber D, Pigott T. Cauda equina screening in Physiotherapy: A qualitative study of physiotherapists in a community musculoskeletal service: Are we asking the right questions and are we asking the questions right? Musculoskelet Sci Pract. 2023;65:102773. PMID 37201228 · doi:10.1016/j.msksp.2023.102773
15. Yeowell G, Leech R, Greenhalgh S, Willis E, Selfe J. The lived experiences of UK physiotherapists involved in Cauda Equina Syndrome litigation. A qualitative study. PLoS One. 2023;18(9):e0290882. PMID 37708146 · doi:10.1371/journal.pone.0290882
16. Greenhalgh S, Finucane L, Mercer C, Selfe J. Assessment and management of cauda equina syndrome. Musculoskelet Sci Pract. 2018;37:69-74. PMID 29935940 · doi:10.1016/j.msksp.2018.06.002
17. Paling C, Hutting N, Devoto K, Galdeano J, Josling K, Goodway L. A service evaluation of the management of patients with suspected cauda equina syndrome from an outpatient physiotherapy service in the United Kingdom. Musculoskelet Sci Pract. 2022;62:102673. PMID 36335852 · doi:10.1016/j.msksp.2022.102673
18. Katzouraki G, Zubairi AJ, Hershkovich O, Grevitt MP. A prospective study of the role of bladder scanning and post-void residual volume measurement in improving diagnostic accuracy of cauda equina syndrome. Bone Joint J. 2020;102-B(6):677-682. PMID 32475252 · doi:10.1302/0301-620X.102B6.BJJ-2020-0195.R1
19. Gooding BW, Higgins MA, Calthorpe DA. Does rectal examination have any value in the clinical diagnosis of cauda equina syndrome? Br J Neurosurg. 2013;27(2):156-9. PMID 23113877 · doi:10.3109/02688697.2012.732715
20. Ahad A, Elsayed M, Tohid H. The accuracy of clinical symptoms in detecting cauda equina syndrome in patients undergoing acute MRI of the spine. Neuroradiol J. 2015;28(4):438-42. PMID 26306934 · doi:10.1177/1971400915598074
21. Hussain MM, Razak AA, Hassan SS, Choudhari KA, Spink GM. Time to implement a national referral pathway for suspected cauda equina syndrome: review and outcome of 250 referrals. Br J Neurosurg. 2018;32(3):264-268. PMID 29607679 · doi:10.1080/02688697.2018.1457771
22. Boktor J, Wong F, Joseph VM, Alshahwani A, Banerjee P, Morris K, et al. Predictive value of post-void residual volume as an adjunctive tool in the clinical evaluation of cauda equina syndrome. Bone Joint J. 2023;105-B(5):487-495. PMID 37121596 · doi:10.1302/0301-620X.105B5.BJJ-2022-0739.R2
23. Todd N, Dangas K, Lavy C. Post-void bladder ultrasound in suspected cauda equina syndrome-data from medicolegal cases and relevance to magnetic resonance imaging scanning. Int Orthop. 2022;46(6):1375-1380. PMID 35182176 · doi:10.1007/s00264-022-05341-0
24. Domen PM, Hofman PA, van Santbrink H, Weber WE. Predictive value of clinical characteristics in patients with suspected cauda equina syndrome. Eur J Neurol. 2009;16(3):416-9. PMID 19490073 · doi:10.1111/j.1468-1331.2008.02510.x
25. Hennessy O, Devitt AT, Synnott K, Timlin M. Assessment and early investigation of cauda equina syndrome- a systematic review of existing international guidelines and summary of the current evidence. Eur Spine J. 2025;34(4):1545-1551. PMID 40000448 · doi:10.1007/s00586-025-08732-0
26. Gibson LL, Harborow L, Nicholson T, Bell D, David AS. Is scan-negative cauda equina syndrome a functional neurological disorder? A pilot study. Eur J Neurol. 2020;27(7):1336-1342. PMID 32073712 · doi:10.1111/ene.14182
27. Gessara AM, Patel MI, Shah S, Shetaiwi A, Vatkar A, Grevitt M, et al. An evaluation of individuals who repeatedly present with suspected cauda equina syndrome. Eur Spine J. 2026;35(8):4858-4863. PMID 41436673 · doi:10.1007/s00586-025-09705-z
28. Finucane LM, Downie A, Mercer C, Greenhalgh SM, Boissonnault WG, Pool-Goudzwaard AL, et al. International Framework for Red Flags for Potential Serious Spinal Pathologies. J Orthop Sports Phys Ther. 2020;50(7):350-372. PMID 32438853 · doi:10.2519/jospt.2020.9971
29. Ahn UM, Ahn NU, Buchowski JM, Garrett ES, Sieber AN, Kostuik JP. Cauda equina syndrome secondary to lumbar disc herniation: a meta-analysis of surgical outcomes. Spine (Phila Pa 1976). 2000;25(12):1515-22. PMID 10851100 · doi:10.1097/00007632-200006150-00010
30. Gleave JR, Macfarlane R. Cauda equina syndrome: what is the relationship between timing of surgery and outcome? Br J Neurosurg. 2002;16(4):325-8. PMID 12389883 · doi:10.1080/0268869021000032887
31. Kumar V, Baburaj V, Rajnish RK, Dhatt SS. Outcomes of cauda equina syndrome due to lumbar disc herniation after surgical management and the factors affecting it: a systematic review and meta-analysis of 22 studies with 852 cases. Eur Spine J. 2022;31(2):353-363. PMID 34581849 · doi:10.1007/s00586-021-07001-0
32. Foruria X, Ruiz de Gopegui K, García-Sánchez I, Moreta J, Aguirre U, Martínez-de Los Mozos JL. Cauda equina syndrome secondary to lumbar disc herniation: Surgical delay and its relationship with prognosis. Rev Esp Cir Ortop Traumatol. 2016;60(3):153-9. PMID 26948511 · doi:10.1016/j.recot.2016.01.003
33. Karikaran A, Carroll AH, Benn L, Okorie N, Bellaire CP, Puvanesarajah V, et al. Cauda Equina Syndrome: A Review of Classification, Diagnosis, Treatment, and Best Practices. JBJS Rev. 2025;13(2). PMID 39937930 · doi:10.2106/JBJS.RVW.24.00156
34. Conte A, Jain R, Lingham A, Mueller M. Cauda Equina Syndrome-A 2025 Narrative Review. Br J Hosp Med (Lond). 2026;87(4):52970. PMID 42053010 · doi:10.31083/BJHM52970
35. Barker TP, Steele N, Swamy G, Cook A, Rai A, Crawford R, et al. Long-term core outcomes in cauda equina syndrome. Bone Joint J. 2021;103-B(9):1464-1471. PMID 34465159 · doi:10.1302/0301-620X.103B9.BJJ-2021-0094.R1
36. Seidel H, Bhattacharjee S, Pirkle S, Shi L, Strelzow J, Lee M, et al. Long-term rates of bladder dysfunction after decompression in patients with cauda equina syndrome. Spine J. 2021;21(5):803-809. PMID 33434651 · doi:10.1016/j.spinee.2021.01.002
37. Hazelwood JE, Hoeritzauer I, Carson A, Stone J, Demetriades AK. Long-term mental wellbeing and functioning after surgery for cauda equina syndrome. PLoS One. 2021;16(8):e0255530. PMID 34358259 · doi:10.1371/journal.pone.0255530
38. Roy H, Anil K, Read J, Drake MJ, Hoeritzauer I, Woodfield J, et al. From hospital discharge to long-term care: Unmet rehabilitation needs in cauda equina syndrome patients from a national UK cohort. World Neurosurg X. 2025;27:None. PMID 42422762 · doi:10.1016/j.wnsx.2025.100485
39. Kanematsu R, Hanakita J, Takahashi T, Minami M, Inoue T, Miyasaka K, et al. Improvement in Neurogenic Bowel and Bladder Dysfunction Following Posterior Decompression Surgery for Cauda Equina Syndrome: A Prospective Cohort Study. Neurospine. 2021;18(4):847-853. PMID 35000340 · doi:10.14245/ns.2142252.126
40. Ethans K, Smith K, Khandelwal A, Nankar M, Shea J, Casey A. Transanal irrigation bowel routine for people with Cauda Equina Syndrome. J Spinal Cord Med. 2024;47(2):263-269. PMID 35108169 · doi:10.1080/10790268.2021.2022371
41. Hao J, Jiang J, Han Q, Wang K, Sun Y, Wang H. Neurogenic bladder pathophysiology, assessment and management after lumbar diseases. EFORT Open Rev. 2025;10(3):156-165. PMID 40071973 · doi:10.1530/EOR-24-0087
42. Bodalia RT, Bogar WC, Rivera-Melo H. Cauda Equina Syndrome Following Lumbar Disc Herniation at L5-S1: A Case Report. J Chiropr Med. 2021;20(3):158-162. PMID 35463844 · doi:10.1016/j.jcm.2021.12.007
43. Lim SK, Lee CH, Oh MK, Chun SW. Neurophysiological Effects of Electrical Stimulation on a Patient with Neurogenic Bowel Dysfunction and Cauda Equina Syndrome after Spinal Anesthesia: A Case Report. Medicina (Kaunas). 2023;59(3). PMID 36984589 · doi:10.3390/medicina59030588
44. Sangondimath G, Mallepally AR, Mascharenhas A, Chhabra HS. Sexual and Bladder Dysfunction in Cauda Equina Syndrome: Correlation with Clinical and Urodynamic Studies. Asian Spine J. 2020;14(6):782-789. PMID 32429016 · doi:10.31616/asj.2019.0305
45. Ahern DP, Gibbons D, Johnson GP, Murphy TM, Schroeder GD, Vaccaro AR, et al. Management of Herniated Lumbar Disk Disease and Cauda Equina Syndrome in Pregnancy. Clin Spine Surg. 2019;32(10):412-416. PMID 31498273 · doi:10.1097/BSD.0000000000000886
46. Vakos A, Dean K, Reeder C, Louis-Jacques A. Management of cauda equina syndrome during pregnancy and postpartum. BMJ Case Rep. 2022;15(4). PMID 35487643 · doi:10.1136/bcr-2020-238793
47. Yang SD, Chen Q, Ding WY. Cauda Equina Syndrome Due to Vigorous Back Massage With Spinal Manipulation in a Patient With Pre-Existing Lumbar Disc Herniation: A Case Report and Literature Review. Am J Phys Med Rehabil. 2018;97(4):e23-e26. PMID 28796647 · doi:10.1097/PHM.0000000000000809
48. Leech RL, Selfe J, Ball S, Greenhalgh S, Hogan G, Holway J, et al. A scoping review: Investigating the extent and legal process of cauda equina syndrome claims for UK physiotherapists. Musculoskelet Sci Pract. 2021;56:102458. PMID 34547610 · doi:10.1016/j.msksp.2021.102458