[Exercise-induced partial damage of the n. peroneus profundus].

Over a period of two years a 26-year-old man active in sports developed progressively more marked pain in the area of the left lateral tibial edge and signs of foot flexor paresis after physical exertion. These symptoms lasted for several hours. Finally there also developed sensory dysfunction in the area of the deep peroneal nerve. Electrophysiological tests revealed normal peroneal nerve conduction velocity but denervation signs in the anterior tibial muscle. In view of the diagnosis of an exercise-induced incomplete chronic anterior tibial syndrome a fasciotomy was performed revealing connective-tissue thickening of the fascial compartment which was clearly compressed. The sensory disorder in the left foot regressed within a few weeks and the patient has been symptom-free since.