RESUMEN
Objective To explore factors affecting posterior tibial slope changes after the medial openwedge high tibial osteotomy.Methods The open-wedge high tibial osteotomy was simulated and performed on the three-dimensional proximal tibia model reconstructed based on the computed tomography (CT) scanning,and the roles of hinge axis direction and correction of genu varum in postoperative posterior tibial slope changes were analyzed separately.Results Hinge axis pointing anterolaterally was significantly associated with the increase of postoperative posterior tibial slope with regard to the axis along the anterior-posterior direction.Meanwhile,the correction of the genu varum at a larger angle was also a crucial factor for the increase of postoperative posterior tibial slopes.Conclusion Postoperative posterior tibial slope changes after open-wedge high tibial osteotomy is closely associated with the hinge axis direction and correcting angle of the genu varum.