University of Pennsylvania Medical Center Radiology Interactive. These figures illustrate the top of the right tibial plateau as we look down on it during knee motion. During the last 20 degrees of knee extension, anterior tibial glide persists on the tibia's medial condyle because its articular surface is longer in that dimension than the lateral condyle's. When the knee begins to flex from a position of full extension, posterior tibial glide begins first on the longer medial condyle. Between 0 deg. extension and 20 deg. of flexion, posterior glide on the medial side produces relative tibial internal rotation, a reversal of the screw-home mechanism.
Forces produce movements, including arthrokinematic movements.