What Is a Slip Disc?

A "slip disc" — the common term for disc herniation or disc prolapse — occurs when the soft inner material of an intervertebral disc (the nucleus pulposus) pushes through the tough outer ring (annulus fibrosus) and compresses nearby nerve roots. The disc does not literally slip out of place; it bulges or herniates in a specific direction, most commonly posterolaterally (towards the nerve roots).

Disc herniation most commonly occurs in the lumbar spine (L4–L5 and L5–S1 are the most affected levels) and the cervical spine (C5–C6 and C6–C7). Thoracic disc herniation is rare.

Symptoms of a Slip Disc

Lumbar (Lower Back) Disc Herniation

Lower back pain, often with a sudden onset
Sciatica — radiating pain from the buttock down the back of the leg, following the sciatic nerve
Numbness or tingling in the leg, foot, or toes
Muscle weakness in the leg (reduced ability to raise the toes, flex the ankle)
Pain worsened by sitting, coughing, sneezing, and flexion

Cervical (Neck) Disc Herniation

Neck pain with radiation into the arm and hand
Tingling or numbness in specific fingers (pattern depends on level)
Weakness in the arm or hand muscles
Pain worsened by neck movement and prolonged sitting

Does a Slip Disc Require Surgery?

This is the most common question we hear at Realign Rehab Clinic, and the answer for the vast majority of patients is no. Landmark research (the SPORT trial and others) shows that 90% of patients with disc herniation and radiculopathy recover with conservative management — primarily physiotherapy — within 3 months. Surgery produces similar long-term outcomes to conservative care but carries surgical risks.

Surgery is indicated when: there is progressive neurological deficit (worsening weakness), cauda equina syndrome (bowel/bladder involvement), or when conservative management has genuinely failed after 6–12 weeks.

Physiotherapy Treatment for Slip Disc

Directional Preference Assessment (McKenzie Method)

Most patients with disc herniation have a directional preference — specific movements that centralise (reduce) their pain. For most lumbar herniations, extension movements (lying prone, gentle backward bending) reduce sciatica and centralise the pain. Identifying and prescribing these movements is a highly effective treatment approach developed by Robin McKenzie and validated by extensive research.

Neural Mobilisation (Nerve Flossing)

Gentle mobilisation of the sciatic or brachial plexus nerves reduces adhesions around compressed nerve roots and improves nerve mobility. Performed as both clinic treatment and home exercises. Highly effective for reducing radiating pain.

Core Stabilisation

Strengthening the deep spinal stabilisers (multifidus and transverse abdominis) reduces load on the herniated disc and protects against recurrence. We use biofeedback techniques to ensure correct activation of these deep muscles rather than the superficial muscles that most patients recruit instead.

Traction

Mechanical lumbar traction reduces intradiscal pressure, creating a negative pressure that helps retract the herniated nucleus material. Effective for acute presentations with significant radiculopathy.

Manual Therapy

Mobilisation of adjacent spinal levels (above and below the herniation) restores movement and reduces compensatory muscle spasm. Direct manipulation at the herniated level is avoided in acute presentations.

Red Flags Requiring Emergency Attention

Go to hospital immediately if you develop: sudden loss of bowel or bladder control with back pain, saddle anaesthesia (numbness in the groin/perineal area), or rapidly progressive bilateral leg weakness. These indicate cauda equina syndrome — a neurosurgical emergency.