Congenital Dislocation of the Knee Joint.
—Baldwin1 reports a case of congenital anterior dislocation of the tibia on the femur. The knee was in a position of extreme hyperextension, and no flexion was possible. The condition was recognized at birth, and the deformity corrected ten days later. Under anesthesia, the dislocation was reduced with little difficulty and the leg splinted. Fixation was discontinued at the end of six months. Now, at the end of eight and one-half years, there is normal function of the knee, and the patella is fully developed. The author notes from the literature that absence of the patella has been a frequent accompaniment of this condition. He believes that the development of a sesamoid bone depends on normal function of its tendon and that in his case the presence of the patella is a result of the early restoration of function.