In anterior cruciate ligament reconstruction (ACLR) and uninjured contralateral knees, the patella articulates higher on the femoral trochlea due primarily to a longer patellar tendon compared with ...

and/or the inferior patellar pole (Sinding-Larsen and Johansson disease). Osteochondrosis of the primary ossification center (Köhler's disease of the patella), however, is infrequently described ...