Medically reviewed by Dr. Tom Biernacki, DPM
Board-certified podiatric surgeon | Balance Foot & Ankle, Howell & Bloomfield Township, MI
Last reviewed: May 2026
| Cause | Mechanism | Who It Affects | Treatment Priority |
|---|---|---|---|
| Lateral ankle sprain | Nerve stretching + perineural scar formation | Athletes; anyone with ankle sprain history | Early intervention; scar mobilization |
| Achilles / ankle surgery | Nerve caught in suture or scar | Post-surgical patients | Hydrodissection; neurolysis |
| 5th metatarsal or fibular fracture | Direct nerve trauma or callus compression | Fracture patients; post-trauma | Decompression if callus compressing |
| Tight boot / ski boot | External compression posterior to lateral malleolus | Skiers; hikers; athletes in stiff boots | Footwear change; padding; injection |
| Peroneal tendon pathology | Tendon sheath swelling compresses adjacent nerve | Peroneal tendinopathy patients | Treat tendon; decompress nerve |
| Ganglion cyst | Cyst mass directly compresses nerve | Any; often incidental on imaging | Aspiration; excision |
| Treatment | Success Rate | Timeline | Best Candidate |
|---|---|---|---|
| Conservative (footwear mod + NSAIDs + PT) | 40–55% | 4–8 weeks | Early; mild entrapment |
| Ultrasound-guided cortisone injection | 55–70% | Days to weeks | Moderate entrapment; any duration |
| Ultrasound-guided hydrodissection | 60–75% in emerging series | 1–3 weeks | Post-surgical or post-sprain fibrosis |
| Surgical neurolysis | 70–80% | 6–8 weeks recovery | Refractory; >6 months failed conservative |
| Neurectomy + muscle burial | 75–85% pain relief; with numbness | 6–12 weeks recovery | Severely damaged nerve; recurrent neuroma |
Medically Reviewed | Dr. Tom Biernacki, DPM | Board-Certified Podiatrist | Balance Foot & Ankle, Michigan | 5,000+ patients/year
Sural Nerve Anatomy
The sural nerve is a purely sensory nerve formed by branches of the tibial and common peroneal nerves in the calf. It runs along the lateral leg, passes posterior to the lateral malleolus, and supplies sensation to the outer ankle, heel, and lateral foot (including the fifth toe). It has no motor function.
Causes of Entrapment
The sural nerve is vulnerable at the posterior lateral malleolus and along the lateral foot. Common causes: ankle surgery (especially lateral ankle stabilization or peroneal tendon surgery), ankle sprains with scar tissue formation, tight footwear rubbing over the nerve, calcaneal fractures, and lipomas or ganglion cysts.
Symptoms
Burning pain, tingling, or numbness along the lateral ankle, outer heel, and dorsal-lateral foot. A positive Tinel’s sign behind the lateral malleolus is diagnostic. Pain may worsen with eversion or inversion of the ankle, tight shoe lacing, or prolonged pressure on the lateral foot.
Diagnosis
Clinical examination with Tinel’s sign localization. Selective nerve block with local anesthetic that temporarily abolishes symptoms confirms the diagnosis. MRI or ultrasound identifies compressive lesions. Nerve conduction studies confirm nerve dysfunction severity.
Treatment
Conservative: Footwear modification (avoid lateral ankle pressure), padding, NSAIDs, desensitization, and diagnostic-therapeutic nerve blocks. Surgical: Sural neurolysis (releasing scar tissue around the nerve) or neurectomy (for irreversible damage with persistent pain). Post-neurectomy, the lateral foot becomes permanently numb but pain resolves.
FAQs
Can a sural nerve injury heal on its own? Minor injuries from ankle sprains often resolve in 6–12 weeks. Post-surgical entrapment in dense scar tissue is less likely to resolve without intervention.
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PubMed: Sural Nerve Entrapment
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Dr. Tom Biernacki, DPM is a board-certified foot & ankle surgeon (ABFAS & ABPM) at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has made him one of the most-followed foot & ankle educators on YouTube.