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Tarsal Tunnel Syndrome

Tarsal tunnel syndrome (TTS) is the foot’s version of carpal-tunnel: the posterior tibial nerve—plus its plantar branches—becomes compressed in the narrow fibro-osseous canal that runs behind the inside ankle bone. The result is burning, tingling, and numbness that can radiate into the arch and toes. Our board-certified podiatrists use targeted ultrasound, EMG/NCV testing, and a tiered treatment ladder—from orthotic off-loading to ultrasound-guided injections and minimally invasive release—to restore comfortable, well-sensate feet.

Pathophysiology & Risk Factors

Constrictive Anatomy Space-Occupying Lesions Systemic Contributors
Hypertrophic flexor-retinaculum after ankle sprain Ganglion cyst, varicose vein, lipoma, accessory muscle (­Abductor hallucis) Diabetes or hypothyroidism (nerve swelling)
Pes planus (flatfoot) → hind-foot valgus stretching nerve Posterior tibial tendon tenosynovitis Inflammatory arthritis causing synovial thickening
Scar tissue post-fracture or surgery Osteophyte from medial malleolus Edema in pregnancy

Hallmark Signs & Symptoms

  • Burning, tingling, or electric shocks along the sole, arch, or inside ankle
  • Numbness in the toes (often 1st-3rd) that worsens after standing
  • Positive Tinel’s sign—tapping behind the medial malleolus reproduces symptoms
  • Night-time discomfort or “hot foot” in bed; often relieved by massage or dangling foot over bed edge
  • Weakness or cramping of intrinsic foot muscles in advanced cases
  • Symptoms aggravated by prolonged standing, running, or pronated posture

Diagnostic Work-Up

  • Focused neurologic exam—Tinel, dorsiflex-eversion test, triple compression test.
  • Diagnostic ultrasound—identifies cysts, varicose veins, tendon sheath swelling.
  • EMG/NCV studies—confirm slowed tibial-nerve conduction across the tunnel.
  • Weight-bearing foot X-ray—checks for hind-foot valgus or bony spur.
  • MRI (if surgery likely)—maps soft-tissue masses and nerve course.

Evidence-Based Management

Conservative (≈ 70 % success) Minimally Invasive Surgical Decompression
Custom orthotics with medial heel skive to correct flatfoot valgus Ultrasound-guided corticosteroid + local anesthetic injection Open or endoscopic flexor-retinaculum release
Activity modification & weight control Hydro-dissection (saline + anesthetic) to separate nerve from fascia Excision of ganglion, varix, or osteophyte if mass effect present
NSAIDs / short oral steroid taper for acute flare Radiofrequency ablation of venous malformations (select cases) Calcaneal osteotomy + medial slide if flatfoot drives nerve tension
Night-time ankle brace to keep foot neutral — Neurolysis & vein ligation when multiple branch entrapment
Calf-stretch & tibialis-posterior-strength program — —

Systematic reviews show ~70 % symptom relief with orthotic valgus correction ± injection; success climbs to > 85 % after well-executed surgical release when conservative care fails.

Treatment Philosophy

  • Mechanics before scalpel We always address hind-foot valgus or cystic mass first; surgery only after clear mechanical or mass-effect failure of conservative care.
  • Imaging-guided accuracy All injections and hydro-dissections are performed under real-time ultrasound to bathe the exact nerve branch and avoid plantar-artery injury.
  • Branch-specific release We decompress the main tibial trunk and medial/lateral plantar branches to minimise recurrence.
  • Post-op protocol Early nerve-glide exercises and custom orthotics protect the release and speed desensitisation.

Frequently Asked Questions

Yes—burning arch pain is common to both. Key differences: TTS often includes numbness/tingling and worsens with standing still, whereas plantar fasciitis hurts most on first steps.

It can shrink local inflammation and relieve pain for months, sometimes indefinitely if orthotics also correct valgus. Recurrence signals scarred retinaculum or mass requiring release.

Most patients bear weight in a boot day 1, switch to athletic shoe at 2 weeks, start nerve-glides at 10 days, and resume low-impact sport by 6 weeks; full running ~10-12 weeks.

Put Out the Foot “Fire”

Persistent arch burning or numb toes aren’t just “tired feet.” Book an evaluation with North Texas Podiatry Associates for imaging-guided diagnosis and a personalized plan—from orthotics to precise nerve release—to restore calm, sensate steps.

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