Flexion Contracture in Knee Osteoarthritis Can Be Fully Eliminated by Hybrid Closed Wedge High Tibial Osteotomy Using a Reduction-Insertion-Compression Handle.

In conventional closed-wedge high tibial osteotomy (CWHTO) with preservation of the medial hinge, flexion contracture cannot be improved because of the two-dimensional correction. Conversely, in hybrid CWHTO, for which the name is derived from a hybrid of the lateral closing and medial opening, the medial cortex is intentionally disrupted. The medial hinge disruption enables three-dimensional correction, which helps eliminate flexion contracture by decreasing posterior tibial slope (PTS). The fine adjustment of the anterior closing distance and thigh-compression technique further facilitates PTS control. In this study, we describe the use of the Reduction-Insertion-Compression Handle (RICH), which maximizes the benefits of hybrid CWHTO. This device permits accurate osteotomy reduction, easy screw insertion, and assists with providing sufficient compressive force at the osteotomy site, as well as the elimination of the flexion contracture. This Technical Note presents the details of using the RICH and the associated advantages and disadvantages in hybrid CWHTO for medial compartmental knee arthritis.