Experimental studies of the kinematics of the stable and unstable human knee joint

In an experimental study the three dimensional kinematic behaviour of fourty knee joint specimen was investigated. We found a continous passive tibial rotation during flexion, so the terminus "screw home mechanism" should no longer be used. There was also an automatic adduction and medialisation movement of the tibia. We calculated the roll-gliding ratio separately for the medial and the lateral side. Only the lateral femoral condyle displayed increasing gliding with pure rolling near extension and pure gliding near flexion. We found little differences concerning qualitative characteristics but not in the amount of passive motions.