[Accuracy of femur mechanical axis in computer-assisted total knee replacement]

The location of the center of the femoral head and the mechanical axis of femur were obtained by using optical tracking localizer in computer-assisted total knee replacement (TKR). The 3-D reconstruction model of femur was used firstly in the accuracy verification of mechanical axis of femur. The results showed that the accurate mechanical axis of femur can be defined by tracking the reference frame pinned at the distal femur. Compared to the intramedullary rods locating, this method introduces mechanical axis error less that 1 and the accuracy and repeatability of mechanical axis definition have been improved greatly.