The calcareous peritendinitis of the long peroneal tendon.

The calcareous peritendinitis of the long peroneal tendon is an occupational disease. It results from one sided overstraining with consecutive micro-or macroruptures in the tendon, lokalised degeneration, and deposition of calcium salts. The disease can be asymptomatic or produce only slight pain. In other cases with acute injury the calcified deposits cause acute discomfort. Three cases with varying course are reported and differential diagnosis and therapy are discussed.