There are 3 arches of the foot that provide both mobility and stability to ambulate. There are at least 3 tests that can be used to assess varying types of mobility (or lack of mobility) of the ankle and foot: navicular drop, Coleman block, and windlass test.
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.