Flexion Deformity

Bone Deformity

First, bone deformity may be a cause. Accurate examination of the location of the bone deformity is important for treatment. In the long-term, it can cause degenerative rupture of the cruciate ligaments of the knee or subluxation/dislocation of the knee joint if not properly located.

Joint Problem

Second, there may be a problem inside the knee joint. Discoid meniscus, avulsion fracture of anterior cruciate ligament and degenerative arthritis can also cause knee flexion.

muscle contracture

Finally, muscle contracture may be a cause. If the backside muscles of the knee are shortened, knee flexion can occur even if the bone and knee joint are normal.