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Foot and Ankle Nerve Entrapments

Overview

Nerves around the foot and ankle can be compressed, stretched or scarred after injury, surgery or repetitive pressure. Symptoms may include burning, tingling, electric pain, numbness or weakness. Similar symptoms can come from the lower back, a more widespread nerve condition, circulation problems or a sensitised pain system. Diagnosis requires the symptom pattern, examination and likely cause to fit; a named nerve on a scan report is not enough.

Examples

  • Tarsal tunnel syndrome: irritation of the tibial nerve or its branches behind the inner ankle.
  • Superficial peroneal nerve entrapment: pain or tingling over the outer lower leg and top of the foot, sometimes where the nerve passes through a tight tissue layer or after ankle trauma.
  • Deep peroneal nerve entrapment: pain or numbness in the space between the first and second toes, or beneath tight footwear at the front of the ankle.
  • Sural nerve irritation: burning or sensitivity behind the outer ankle and along the outer foot, often after injury or surgery.
  • Baxter nerve or other heel-branch entrapment: one possible cause of persistent medial plantar heel pain.
  • Interdigital nerve irritation: Morton’s neuroma in the forefoot.

Assessment

Assessment maps the exact area of altered feeling, provoking positions, muscle power, reflexes, foot alignment, scars, swelling and nearby tendon or joint problems. The back and nerves higher in the leg may also need examination. Diabetes, thyroid disease, vitamin deficiency, alcohol, chemotherapy and other causes of nerve damage are considered.

Ultrasound can identify a localised lesion, cyst, scar or compression that occurs during movement. MRI may show a mass or a nearby problem. Nerve-conduction studies can support some diagnoses but may be normal in a localised sensory-nerve entrapment and cannot replace matching the results with symptoms and examination. A targeted local anaesthetic injection is occasionally useful.

Non-surgical treatment

  • Remove external pressure from shoes, braces or repetitive positions.
  • Modify aggravating activity and manage swelling.
  • Physiotherapy for nerve mobility, desensitisation, strength and contributing movement or loading patterns.
  • An insole when foot alignment or local pressure contributes.
  • Medicine for neuropathic pain may be considered with the treating doctor when suitable, after discussing side effects and interactions.
  • A targeted injection may be used selectively when the anatomy and diagnosis are clear. It should not be repeated simply because symptoms are difficult to explain.
  • Treat an underlying cyst, arthritis, diabetes or more widespread nerve condition where possible.

When may surgery be considered?

Surgical release of the nerve may be considered when there is a well-localised entrapment, a correctable structural cause, progressive muscle weakness or persistent substantial symptoms despite appropriate non-surgical care. Results are less predictable when symptoms are widespread, longstanding or caused by a more widespread nerve condition, spinal disease or a sensitised pain system.

Surgery releases tight tissue or scar and protects the nerve from an identified source of pressure. A cyst, bone prominence or associated tendon problem may also be treated. A damaged sensory nerve or painful neuroma may occasionally require removal, repair or relocation, which can leave numbness.

Recovery

The wound and nerve are protected while swelling settles, followed by gradual movement, desensitisation and strength work. Nerve recovery is slow and improvement may continue for many months. Longstanding numbness or weakness may not fully reverse even after adequate decompression.

Temporary tingling or altered sensation can occur as the nerve recovers. Persistent severe pain requires reassessment rather than repeated escalation of activity.

Risks and limitations

  • Wound problems, infection, bleeding or blood clots.
  • Persistent or worsened neuropathic pain.
  • Numbness, weakness or painful neuroma.
  • Scar tethering or recurrent compression.
  • Complex regional pain syndrome.
  • No improvement when the symptoms arise from another site or a more widespread nerve condition.
  • Need for further investigation or surgery.

Seek prompt review

New or progressive weakness, foot drop, numbness around the groin, loss of bladder or bowel control, rapidly spreading numbness, a cold or discoloured foot, severe swelling or symptoms after a major injury require urgent assessment.

Frequently asked questions

No. A widespread nerve condition, a nerve problem arising from the lower back, circulation problems, inflammation and a sensitised pain system can produce similar symptoms.

No. They are useful for some conditions but can be normal in small or intermittent sensory nerve problems.

Nerve recovery is slow and depends on duration and severity of compression. Improvement may continue for many months, and complete recovery is not guaranteed.

Yes. Nerve surgery carries a risk of persistent or increased neuropathic pain, scar sensitivity and neuroma, so diagnosis and selection are important.

No. Morton’s neuroma affects an interdigital nerve in the forefoot; tarsal tunnel syndrome involves the tibial nerve or branches near the inner ankle.

General information

This page provides general information only. It cannot diagnose your condition or replace advice from a clinician who has assessed you. Your treatment and recovery plan may differ from the examples described here. Follow the instructions from your treating team. In an emergency, call 000 or attend the nearest emergency department.

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