Kinematics of the Normal Native Knee
‘Kinematics’ is a term often used in orthopaedics, unfortunately not always in the correct sense of the word. The term ‘kinematics’ is derived from mechanical engineering and refers to the relative motion of rigid bodies. In mechanical engineering the description has to be mathematically exact and correct. Tibiofemoral kinematics of the knee is hard to describe unequivocally and mathematically correct. The reason for this is twofold:
The native knee has a natural and intrinsic laxity, allowing it to follow several kinematic patterns.
The kinematic pattern of the native knee consists of rotation around different axes, in addition to translations.
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