Overview
Degenerative disc disease (DDD) is not a disease in the traditional sense but a progressive structural deterioration of the intervertebral disc resulting from the cumulative effects of aging, mechanical loading, and biological changes in disc matrix composition. While disc degeneration is a near-universal finding with advancing age, it becomes clinically significant when it produces persistent pain, segmental instability, or neural compression that impairs function.
Pathophysiology
The intervertebral disc undergoes progressive desiccation as its proteoglycan content diminishes with age, reducing the nucleus pulposus from a highly hydrated gel to a fibrocartilaginous structure with diminished shock-absorbing capacity. Loss of disc height results in increased mechanical load transfer to the facet joints and posterolateral elements, accelerating facet arthrosis and ligamentum flavum hypertrophy. Annular fissures develop, providing both a pain generator (via nociceptive innervation of the outer annulus) and a pathway for nuclear herniation. End-plate changes (Modic changes) reflect the vascular and marrow response to adjacent disc pathology.
Symptoms
- Axial low back or neck pain — often described as deep, aching, and mechanical in character
- Pain exacerbated by prolonged sitting, forward flexion, or axial loading
- Improvement with position changes, recumbency, or walking
- Referred pain to the buttocks or thighs (without true radiculopathy) in lumbar DDD
- Headaches and interscapular pain with cervical disc degeneration
- Radicular symptoms if associated disc herniation or foraminal stenosis is present
Diagnosis
Standing radiographs document disc height loss, osteophyte formation, and segmental alignment. MRI characterizes disc signal intensity, annular integrity, end-plate morphology, and neural element status. Provocative discography — though rarely used today — may help confirm a specific painful segment when multilevel degeneration is present and surgical planning requires precise localization.
Non-Surgical Treatment
A structured and graduated rehabilitation program remains the foundation of management: core stabilization, postural correction, aerobic conditioning, and patient education regarding activity modification. NSAIDs, muscle relaxants, and neuromodulatory agents address the pain component. Facet joint injections and medial branch blocks can identify facetogenic pain generators and facilitate targeted radiofrequency ablation for longer-lasting relief.
Surgical Indications & Procedures
Surgical intervention is appropriate when disabling axial pain persists despite comprehensive conservative care and a clear pain generator can be identified. Dr. Kwan offers the full spectrum of motion-preserving and fusion-based procedures:
- Total disc replacement (arthroplasty): Preserves segmental motion at the operated level; preferred in young active patients with single-level disease and preserved disc height
- ACDF (anterior cervical discectomy and fusion): Gold standard for cervical disc disease with radiculopathy or myelopathy
- Lumbar interbody fusion (TLIF, LLIF, ALIF): Restores disc height, decompresses neural elements, and eliminates painful motion at the degenerative segment
Consult Dr. Kevin Kwan
The management of degenerative disc disease requires careful individualization. Dr. Kwan evaluates each patient comprehensively and prioritizes motion-preserving strategies when appropriate, reserving fusion for cases where instability, deformity, or multi-segment disease makes it the superior choice.