What is a Lumbar Disc Herniation (Slipped Disc)?

Biomechanics of Lumbar Disc Rupture

Intervertebral discs act as shock absorbers between lumbar vertebrae. When mechanical stress exceeds the tensile strength of the outer annulus fibrosus, nucleus pulposus material herniates into the spinal canal, initiating neurogenic inflammation.

Typical Symptoms

• Sharp, shooting pain traveling through the buttock down to the calf or foot (sciatica)
• Sensory paresthesias, numbness, or tingling along affected dermatomes
• Motor weakness in ankle dorsiflexion (foot drop) in high-grade compression
• Exacerbation of pain during coughing, bending, or sitting

Frequently Asked Questions

Does a herniated lumbar disc always require surgery?

Over 90% of cases resolve favorably with conservative protocols, core stabilization, and targeted epidural steroid injections. Progressive motor deficit serves as an indication for microdiscectomy.