What Is Degenerative Disc Disease?
Degenerative disc disease (DDD) describes the age-related changes that occur in the intervertebral discs — the soft cushions between vertebral bodies. Despite the term 'disease', DDD is a normal biological process that begins as early as the second decade of life and affects virtually everyone to varying degrees by the sixth decade.
Structural Changes in DDD
| Change | Clinical Consequence |
|---|---|
| Loss of disc water content | Reduced shock absorption, increased rigidity |
| Disc height reduction | Foraminal narrowing, nerve root compromise potential |
| Annular tears | Pain from disc innervation, nucleus pulposus extrusion |
| Osteophyte formation | Spinal canal or foraminal narrowing |
| Facet joint arthritis | Secondary facet pain, further instability |
| Segmental instability | Abnormal motion causing pain and muscle guarding |
Why DDD Causes Pain
Disc degeneration itself is often painless. Pain arises from:
- Disc innervation — the outer annulus fibrosus is innervated; tears produce localised deep aching
- Inflammatory mediators — nucleus pulposus contains inflammatory chemicals (PLA2, TNF-α) that irritate adjacent nerve roots
- Segmental instability — degenerated discs allow abnormal intersegmental motion, causing microtrauma
- Facet joint loading — disc height loss shifts load to the posterior facet joints, causing osteoarthritic pain
- Neural compression — osteophytes or disc bulges compress nerve roots, causing radiculopathy
Physiotherapy Protocol for DDD
Phase 1: Acute Pain Management (Weeks 1 to 2)
Goals: Reduce pain, restore functional movement
- Thermal modalities: heat or ice for pain relief (patient preference)
- IFT or TENS electrotherapy for pain modulation
- Gentle neural mobilisation — sciatic nerve glides, femoral nerve glides
- Positional relief teaching — identifying pain-relieving postures
- Activity modification — avoid heavy lifting and prolonged sitting
Phase 2: Stabilisation (Weeks 3 to 6)
Goals: Restore core control, reduce painful intersegmental movement
Core Stabilisation Programme:
- Transversus abdominis activation (abdominal draw-in): 10 × 10-second holds
- Multifidus activation: prone lying with simultaneous arm and leg lift
- Bridge exercise: 3 × 15 repetitions
- Dead bug: 3 × 10 per side
- Modified plank: progressed from knees to full position
Phase 3: Progressive Loading (Weeks 7 to 12)
Goals: Increase functional capacity, load tolerance, and return to activity
- Progressive resistance training: squats, deadlifts (low load, perfect form)
- Cardiovascular training: cycling, swimming, walking programme
- Sport-specific training as relevant
- Postural retraining for occupational activities
Manual Therapy Interventions
- Spinal joint mobilisation at adjacent healthy segments
- Soft tissue massage for paraspinal muscles
- Dry needling for multifidus and erector spinae trigger points
- Traction (intermittent) for foraminal stenosis symptoms
Lifestyle Modifications for DDD
| Modification | Rationale |
|---|---|
| Ergonomic workstation | Reduces prolonged loaded lumbar flexion |
| Weight management | Reduces axial disc load |
| Smoking cessation | Nicotine impairs disc nutrition via vertebral end plate |
| Regular movement breaks | Prevents sustained load causing disc pressurisation |
| Swimming or cycling | Maintains fitness without high axial disc loads |
When to Consider Surgery
Surgical referral is appropriate when:
- Conservative management (including structured physiotherapy) has been maintained consistently for 6 to 12 months without adequate improvement
- Neurological deficits are progressive
- Quality of life is severely and objectively impaired
Surgical options include disc arthroplasty (artificial disc replacement) and spinal fusion. Both have modest long-term outcomes compared to conservative management.
For related conditions, see spinal stenosis exercises and L4-L5 disc prolapse.
References
- Luoma K et al. Low back pain in relation to lumbar disc degeneration. Spine. 2000.
- Richardson C et al. Therapeutic Exercise for Lumbopelvic Stabilization. Churchill Livingstone. 2004.
- Brox JI et al. Randomised clinical trial of lumbar instrumented fusion and cognitive intervention and exercises in patients with chronic low back pain and disc degeneration. Spine. 2006.