​Nerve Compression & Entrapment

The foot and ankle are supplied by several peripheral nerves whose branches run close to the skin surface, through confined anatomical spaces, or beneath tight fascial bands — making them susceptible to compression, entrapment, and traction injury. Nerve entrapment produces a characteristic symptom complex: burning, tingling, shooting pain, or numbness in the nerve's distribution — symptoms that are distinct from the muscular aching of tendinitis or the bony pain of fracture, and that can be reproduced by firm pressure over the compressed nerve segment.

The superficial peroneal nerve runs down the lateral leg, pierces the fascia in the lower third of the leg, and branches to supply sensation to the dorsum of the foot and toes — most of the top of the foot. Entrapment at the fascial exit point produces burning or tingling across the dorsum with activity, and is particularly associated with ankle inversion injuries that stretch the nerve. Tight footwear, fascial bands, and ganglionic cysts at this level can also produce compression.

The deep peroneal nerve runs beneath the extensor retinaculum at the anterior ankle and supplies sensation to the first web space — the skin between the first and second toes. Compression here — anterior tarsal tunnel syndrome — produces burning and numbness specifically in the first web space, often aggravated by tight footwear across the dorsum. Dorsal bone spurs at the tarsometatarsal joints or extensor tendon ganglia at this level are common structural causes.

The sural nerve runs behind the lateral malleolus and along the lateral foot to supply sensation to the outer ankle, lateral heel, and fifth toe. Entrapment at the lateral ankle — often following ankle sprain with perineural scarring — or compression from tight footwear at the lateral heel produces burning and numbness along the outer foot. The sural nerve is also vulnerable to injury during ankle surgery.

Distinguishing focal nerve entrapment from peripheral neuropathy is an important clinical task. Peripheral neuropathy tends to produce bilateral, symmetric, stocking-distribution symptoms that worsen distally. Nerve entrapment is typically unilateral, follows a specific nerve's distribution, and can be reproduced by pressure or Tinel's sign at the compression point. The distinction determines the management approach — nerve entrapment has specific mechanical and surgical solutions that are not relevant to peripheral neuropathy.

Dr. Gunter evaluates nerve symptoms in the foot with attention to the specific distribution, the presence of Tinel's sign, the clinical history of prior injury or footwear pressure, and electrodiagnostic or imaging studies when the diagnosis is uncertain.