Mild Spinal Stenosis (Back Impingement): Causes, Symptoms, and Treatment

Definition

Spinal stenosis = narrowing of the spinal canal or neural foramina, compressing neural elements. "Mild" implies radiographic narrowing with modest or intermittent symptoms.

Common Causes

• Degenerative: facet hypertrophy, ligamentum flavum thickening, disc bulge, osteophytes.
• Congenital: short pedicles, narrow canal (presents earlier).
• Spondylolisthesis: vertebral slippage narrows canal.
• Post-traumatic / post-surgical scarring.

Typical Symptoms (Neurogenic Claudication)

• Back/buttock/thigh pain worsened by standing/walking (extension).
• Relieved by sitting, forward flexion, lying supine (flexion opens canal).
• Numbness, tingling, heaviness in legs.
• Variable walking distance ("shopping cart sign" – leaning on cart relieves symptoms).

Conservative Management

• Physical therapy: core stabilization, flexion-based exercises, lumbar mobilization.
• Activity modification: avoid prolonged standing/extension.
• NSAIDs, topical diclofenac, gabapentinoids for neuropathic component.
• Epidural steroid injections (transforaminal/interlaminar) – temporary relief.
• Weight loss if obese.

Surgical Indications

• Progressive neurologic deficit.
• Intractable pain limiting function despite 3–6 months conservative care.
• Cauda equina syndrome (emergency).

Procedures: laminectomy, laminotomy, foraminotomy, ± fusion if instability.

Most mild stenosis is managed non-operatively; regular follow-up monitors progression.