Fig. 1A–B.

The theoretical effect of ligament releases on femoral component rotation is shown. (A) For medial ligament release, when the tensor is inserted in the knee, the femur will exorotate as a result of the enlarged medial ligament. Consequently, the femur component of the prosthesis will be placed in endorotation with respect to the femur because the posterior cut is parallel to the tibia cut. (B) For a lateral ligament release, when the tensor is inserted in the knee, the femur will endorotate as a result of the enlarged lateral ligament. Consequently, the femur component of the prosthesis will be placed in exorotation with respect to the femur as the posterior cut is parallel to the tibia cut.