Expertise · Diagnosis & Treatment
Disc Herniation
A disc herniation occurs when the soft core of an intervertebral disc breaks through the outer ring and presses on a nerve – often accompanied by severe pain radiating into the leg. Many herniations improve even without surgery. In the presence of neurological deficits, cauda equina syndrome or pain resistant to treatment, however, prompt surgery is clearly superior.
What is a disc herniation?
The intervertebral discs act as shock absorbers between the vertebral bodies. Each consists of a gel-like core (nucleus pulposus) and a fibrous outer ring (annulus fibrosus). If the outer ring tears – through years of wear or a sudden mechanical force – the core can extrude and compress an adjacent nerve.
The lower levels of the lumbar spine are most commonly affected, particularly L4/L5 and L5/S1. The nerves supplying the leg, foot and toes run from there – which explains the typical radiating pain.
This page covers lumbar disc herniation (lower back). Neck complaints radiating into the arm and hand are described on the Cervical spine page.
Symptoms
Symptoms depend on which nerve is affected and the degree of compression:
- Pain radiating into the leg – often burning or electric, usually one-sided (sciatica, medical term: lumbar radiculopathy)
- Numbness or tingling in the leg, foot or toes
- Muscle weakness – e.g. weakness lifting the foot (foot drop) or standing on tiptoe
- Back pain – often dominant at the outset, shifting into the leg as nerve compression increases
- Worsening on sitting, coughing or straining – increased pressure within the disc space and on the nerve root aggravates symptoms
Causes and risk factors
A disc herniation usually does not result from a single event but from years of wear – an acute event is often just the final trigger:
- Age-related loss of water content in the disc – reduces its shock-absorbing function
- Heavy lifting with a twisted back – a common trigger of acute herniation
- Prolonged sitting increases pressure on the lumbar spine
- Overweight places additional load on the lower discs
- Smoking impairs disc nutrition
- Genetic predisposition – familial clustering is documented
Diagnosis
The basis is the clinical examination: reflexes, strength testing, sensation, stretch signs (straight leg raise/Lasègue test for L4/L5/S1; femoral stretch test for high lumbar herniations at L3/L4 with pain radiating into the front of the thigh). During the first four weeks, imaging is only necessary in the presence of warning signs or if there is no improvement.
- MRI (magnetic resonance imaging) – gold standard; shows the location and extent of the herniation and the affected nerves without radiation exposure
- CT – if MRI is not available or to assess bone
- Neurography / EMG – supplementary when involvement of several nerve roots is unclear
Early imaging in the absence of warning signs usually does not change the treatment strategy in the first few weeks – and can cause unnecessary concern due to incidental findings.
Treatment
Conservative therapy – usually the right path
Around 70% of all disc herniations heal without surgery. The extruded material is broken down by the body over weeks to months (resorption). Conservative measures help bridge symptoms during this phase:
- Physiotherapy and movement – bed rest is counterproductive; moderate, pain-adapted activity speeds up healing
- Anti-inflammatory medication (NSAIDs) – effective in the short term, reduce pain and inflammation
- Periradicular therapy (selective nerve root injection) – cortisone applied directly to the affected nerve root; effective for persistent symptoms
- Oral cortisone – short-term for severe pain
Manual therapy, osteopathy and acupuncture are frequently requested; the scientific evidence is limited, but individual patients report benefit.
When is surgery indicated?
Surgery is clearly indicated in the case of:
- Cauda equina syndrome – immediate surgery required
- Relevant or progressive muscle weakness (e.g. foot drop)
- No improvement after 6 weeks of conservative treatment
- Unbearable pain despite optimal conservative therapy
Surgical procedures
Endoscopic discectomy
Minimally invasive procedure performed through a skin incision a few millimetres in size. A thin endoscope is guided directly to the herniation, gently relieving the trapped nerve. The procedure is possible under local anaesthesia without general anaesthesia – particularly advantageous for older patients or those with an elevated anaesthetic risk.
Microsurgical discectomy
A well-established standard procedure performed under general anaesthesia. The herniated material is removed through a small incision under the operating microscope. Very high success rate, well studied, suitable for all constellations including complex findings. Depending on the findings, a choice is made between sequestrectomy (removal of only the free fragment) and extended discectomy (additional removal of disc material) – an individual decision weighing recurrence risk against preservation of disc height.
After surgery
- Mobilisation on the day of surgery – getting up and taking first steps on the day of the operation; hospital stay typically 1–3 days
- Driving usually possible after 1–2 weeks (depending on side, vehicle type and symptoms)
- Office work typically after 2–3 weeks; physical or heavy work after 6–12 weeks
- Sport resumed gradually from 4–6 weeks – initially swimming, Nordic walking; full training later depending on the sport
- Recurrence risk approximately 5–15% depending on defect size, remaining disc material and individual factors – a further herniation is possible but not the rule
My approach
The most common source of error in disc herniation is a surgical indication set too early or too liberally – but also delaying too long in the presence of clear signs. My standard is a sober assessment: where does the patient stand in the natural course? What has already been exhausted? Is there a clear indication?
Where a surgical indication exists, I perform endoscopic discectomy under local anaesthesia whenever possible – this shortens the hospital stay, minimises anaesthetic risk and allows rapid rehabilitation. For more complex findings or concurrent instability, the microsurgical technique is used, with stabilisation where appropriate.
More on endoscopic and minimally invasive procedures →What does the research say?
SPORT trial: surgery vs conservative therapy (JAMA 2006)
The SPORT trial is the largest randomised study on disc herniation. At 3 months, surgically treated patients showed markedly greater pain relief and functional improvement than those treated conservatively. In milder cases, long-term outcomes converged – underscoring the importance of a precise surgical indication. Weinstein JN et al., JAMA 2006, PMID 17119141 →
Early surgery for motor deficits – timing is crucial (Spine 2019)
Petr et al. (Innsbruck) prospectively examined the effect of surgical timing on motor recovery in patients with acute motor loss due to lumbar disc herniation. Patients operated on within a few days showed a significantly higher recovery rate than those in whom surgery was delayed. The study underscores: with motor deficits, every day counts. Petr O et al., Spine 2019, PMID 28658038 →
Microdiscectomy for persistent radiculopathy – effective even after months (NEJM 2020)
Bailey et al. compared microdiscectomy with conservative treatment in a randomised trial of patients with 4–12 months of radicular pain. Surgery was clearly superior to conservative therapy for pain reduction at 6 months (pain score 2.8 vs 5.2). The study dispels the myth that surgery after three months comes "too late". Bailey CS et al., NEJM 2020, PMID 32187469 →
Early surgery vs prolonged conservative care for sciatica (NEJM 2007)
Peul et al. compared early surgery with one year of conservative treatment in patients with 6–12 weeks of sciatic pain. Patients operated on early achieved relief significantly faster. The 1-year outcome was comparable – but the waiting period means unnecessarily prolonged pain for many patients. Peul WC et al., NEJM 2007, PMID 17538084 →
Endoscopic vs microsurgical discectomy (Spine 2008)
Ruetten et al. compared full-endoscopic with microsurgical discectomy in a prospective randomised study. Both procedures achieved equivalent clinical outcomes – the endoscopic group benefited from fewer wound complications, a shorter hospital stay and a faster return to daily activities. Ruetten S et al., Spine 2008, PMID 18427313 →
Questions about your situation?
Describe your symptoms to me. I take the time to review your findings, carry out an examination and provide a clear, written assessment.