Roentgen stereophotogrammetric methods for the evaluation of the three dimensional kinematic behaviour and cruciate ligament length patterns of the human knee joint

Using high-accuracy roentgen stereophotogrammetry, some aspects of the three dimensional kinematics of two amputated knee joints have been studied. Instant axes of rotation, as well as cruciate ligament length patterns, were evaluated as function of the flexion-extension angle. As demonstrated by the results, this method of investigation proved to be most effective, in its accuracy as well as in its flexibility aspects.