[Entrapment syndrome of the superficial posterior sural aponeurosis].

The development of a large circumscribed area of myositis ossificans at the junction of the aponeurosis of the tendo Achilles and the calf muscles may cause compression of the lateral saphenous nerve beneath the tight aponeurotic arch. The condition is usually encountered in athletes. Plantar flexion of the ankle will produce pain and diminution of sensation in the area served by the nerve. Treatment is by section of the tight band.