Neglected congenital permanent dislocation of the patella: a case report.

A 50-year-old man with asymptomatic bilateral congenital permanent dislocation of the patella had never been treated until two years following a fall on his left knee, on which occasion he had torn the lateral meniscus. In this unusual case, surgical treatment was performed to restore the power of the active extension in the left knee by removal of the torn meniscus. The results at 28 months following up were satisfactory for normal occupational activities.