Insufficiency avulsion fracture of the femoral attachment of the posterior cruciate ligament of the knee joint.

Multiple ligaments are involved in avulsion injuries of the knee joint, including both anterior and posterior cruciate ligaments; however, avulsion injury of the posterior cruciate ligament is less frequently encountered than the anterior counterpart. Furthermore, avulsion of the femoral side of the posterior cruciate ligament is far less common than the tibial one.Femoral attachment avulsion fracture of the posterior cruciate ligaments has been reported in literature in adolescents, rarely in adulthood, and never before in elderly patients, showing an inverse relationship with advancement in patient age. The case presented here shows femoral attachment avulsion fracture of the posterior cruciate ligament in an elderly patient with secondary osteoporosis.