What is cauda equina syndrome?
Short answer
Cauda equina syndrome (CES) is compression of the bundle of nerve roots at the base of the spinal cord, most often caused by a large central lumbar disc prolapse. It is a surgical emergency: without prompt decompression, the resulting damage to bladder, bowel, sexual function and lower-limb mobility can be permanent.
CES is rare but well known to GPs, A&E clinicians, physiotherapists and spinal surgeons. National guidance — including the GIRFT national pathway and SBNS/BASS standards — sets out clear expectations for recognition, urgent MRI and emergency decompression.
The red-flag symptoms every clinician must look for
A patient with back pain who reports any of the following should be treated as suspected cauda equina syndrome until an MRI excludes it:
- Bilateral sciatica (leg pain or weakness on both sides)
- Saddle anaesthesia or altered sensation in the perineum, genitals or inner thighs
- Urinary retention, incontinence or loss of bladder sensation
- Faecal incontinence or loss of anal tone
- Sexual dysfunction of new onset
- Progressive lower-limb neurological deficit
Examination must include perianal sensation, anal tone (digital rectal examination) and, where appropriate, a post-void bladder scan. Failure to examine for these signs — or to document that they were checked — is a common feature of successful claims.
Why time matters: CES-I, CES-R and outcomes
Cauda equina syndrome is usually classified as incomplete (CES-I) — altered urinary sensation but no retention — or with retention (CES-R). Outcomes for bladder, bowel and sexual function are significantly better when decompression takes place before retention is established. This is why guidance treats suspected CES as a same-day emergency, not a next-day problem.
How cauda equina negligence claims arise
GP failure to recognise red flags
A patient attends with back pain and one or more red-flag symptoms — saddle numbness, urinary changes, bilateral leg symptoms — but is reassured, prescribed analgesia or physiotherapy and sent home rather than referred urgently for MRI.
A&E failure to examine for red flags
A patient presents to A&E with back pain and leg symptoms. Perianal sensation, anal tone and post-void bladder scan are not assessed or documented. The patient is discharged with simple analgesia and red-flag advice that does not capture the symptoms already present.
Delay in MRI imaging
CES is suspected but MRI is not arranged urgently — the patient is placed on a routine list, sent home to return the next day, or transferred between hospitals without imaging. Hours of delay can be the difference between CES-Incomplete and CES with Retention.
Delay in surgical decompression after diagnosis
MRI confirms cauda equina compression but transfer to a spinal centre, theatre booking or consultant decision-making is delayed. Outcomes deteriorate sharply once urinary retention is established.
Failure to safety-net
A patient with back pain is discharged without clear, documented advice on which symptoms require an immediate return to A&E. The patient develops red flags at home and does not recognise the urgency.
Misinterpreted imaging
An MRI is performed but the cauda equina compression is missed or under-reported by the reporting radiologist, and the patient is reassured.
What you need to prove
- Duty of care — owed by every clinician who assessed or treated you.
- Breach of duty — the assessment, referral, imaging or surgery fell below the standard of a reasonably competent clinician in that setting, judged against the Bolam test and national CES pathways.
- Causation — earlier recognition, imaging or surgery would, on the balance of probabilities, have led to a materially better outcome (typically: bladder, bowel, sexual or mobility function preserved that is now permanently impaired).
- Damage — permanent physical and psychological harm and the financial losses that flow from it.
What harm follows missed or delayed cauda equina treatment?
- Permanent bladder dysfunction — retention, incontinence, reliance on intermittent self-catheterisation
- Permanent bowel dysfunction — incontinence, need for manual evacuation or irrigation
- Sexual dysfunction and loss of genital sensation
- Lower-limb weakness, foot drop and chronic neuropathic pain
- Loss of employment and career, especially in physical or driving roles
- Significant psychological injury — depression, PTSD, relationship breakdown
How much compensation can you claim?
General damages are assessed against the Judicial College Guidelines and comparable case law. As a rough indication for the bladder, bowel and sexual dysfunction component alone:
- Significant permanent damage with marked impact on daily life: roughly £75,000 – £170,000
- The most severe cases (complete loss of function, severe pain, mobility loss): £170,000 – £224,000+
On top of general damages, special damages frequently include past and future care, catheters and continence products, equipment, home and vehicle adaptations, lost earnings and pension, and the cost of fertility or psychological treatment. Total awards in serious cauda equina negligence cases regularly exceed £500,000 and can reach into the millions where future care needs are substantial.
What is the time limit?
Three years from the date of the negligent act or the date of knowledge — when you first knew (or could reasonably have known) that the failure of care caused your injury. Children have until their 21st birthday. Where the injured person lacks mental capacity, no time limit runs while incapacity continues.
How is a cauda equina claim funded?
Almost all cauda equina negligence claims are funded on a Conditional Fee Agreement — no win no fee. You pay nothing upfront and nothing if the claim fails. The success fee is capped at 25% of past losses and general damages; future losses are fully protected, which matters because future care is often the largest head of loss in these cases.
Frequently asked questions
How quickly should cauda equina syndrome be operated on?
Current UK guidance is that suspected cauda equina syndrome is a surgical emergency. Patients with red-flag symptoms should have an urgent MRI scan and, where CES is confirmed, decompression surgery as soon as reasonably possible — ideally before progression from incomplete CES (CES-I) to retention (CES-R), because outcomes after retention are significantly worse.
What are the red-flag symptoms of cauda equina syndrome?
Bilateral sciatica, saddle anaesthesia or altered sensation around the genitals, perineum or inner thighs, urinary retention or incontinence, faecal incontinence or loss of anal tone, and sexual dysfunction. Any of these in a patient with back pain should trigger immediate emergency referral and MRI.
Can I claim if my GP or A&E sent me home with back pain?
Yes, if you reported red-flag symptoms — or symptoms that should have prompted further questioning about red flags — and you were not referred for emergency assessment, that may be a breach of duty. If earlier surgery would have prevented the permanent damage you now have, the claim can succeed.
How much compensation can I claim for cauda equina syndrome?
Compensation depends on severity. Judicial College Guidelines for the most serious cauda equina cases — significant bladder, bowel and sexual dysfunction with mobility impairment — range from roughly £56,000 to over £224,000 in general damages, plus past and future losses for care, equipment, lost earnings and home adaptations. Total awards in severe cases regularly exceed £500,000.
What is the time limit for a cauda equina negligence claim?
Three years from the date of the negligent act or from the date you first knew (or ought to have known) that the care caused your injury. Children have until their 21st birthday. The court has a discretion to extend in limited circumstances.
Related guides
- Medical negligence claims — complete guide
- GP negligence claims
- A&E negligence claims
- Misdiagnosis and delayed-diagnosis claims
- Sepsis negligence claims
- How to prove medical negligence
- How much compensation can you claim?
Sources & further reading
Primary statute, case law and regulator guidance referenced in this article.
- Getting It Right First Time (GIRFT) — Suspected Cauda Equina Syndrome National Pathway — NHS England / GIRFT
- Society of British Neurological Surgeons & British Association of Spine Surgeons — Standards of Care for Cauda Equina Syndrome — SBNS / BASS
- NICE CKS — Sciatica (lumbar radiculopathy): assessment, including red flags — NICE
- Bolam v Friern Hospital Management Committee [1957] 1 WLR 582 — Case law
- Bolitho v City and Hackney Health Authority [1997] UKHL 46 — Case law
- Judicial College Guidelines for the Assessment of General Damages — Judicial College
- Limitation Act 1980 — UK Legislation