Abstract
Precise biomechanical knowledge of individual components of the MCL is critical for proper MCL release during TKA. This study was to define the influences of the deep MCL and the POL on valgus and rotatory stability in TKA using six cadaveric knees with sequential sectioning sequence. A CT-free navigation system monitored motion after application of valgus loads and internal and external rotation torques at 0°, 20°, 30°, 60°, and 90°of knee flexion. Significant increases of rotatory instability were seen on release of the deep MCL. And, rotatory instability further increased after release of the POL. Surgical approach of retaining the deep MCL and POL has a possibility to improve the outcome after primary TKA.
