Abstract
The design of the Ortholoc Total Knee System has changed 4 times since 1984. In this study, biomechanical studies which supported the design change are summarized. In 1989, the Ortholoc 3 was developed. The most important part of the design of this femoral component was the recessed patellar groove. In 1990, a biomechanical study was performed to get a large flexion angle for Japanese patients and the posterior flange of the femoral component was shortened. Other designs and operative techniques are established.
However, antomical variation of the lower extremity has not been considered in the biomechanical studies. Clinically, a preoperative evaluation of each patient is important to minimize failures.
