The Canadian Spine Rules and the NEXUS Spine Rules provide important algorithms to determine if radiographs are needed.
Although the patellofemoral joint is not a true articulation, is serves a very important purpose. As the largest sesamoid bone in the body, it forms the least congruent joint in the body.
The posterior cruciate (PCL) is composed of two bands that blend together. It attaches to the posterior intercondylar area and passes anterosuperiorly to insert into the lateral surface of the medial femoral condyle. The PCL is responsible for posterior translation of the tibia on the femur in open kinetic chain and anterior translation of the femur on the tibia in closed kinetic chain.