Fig. 3From: Estimation of the proper gap ratio using preoperative radiography for posterior tibial slope maintenance in biplanar open wedge high tibial osteotomyGap measured on computed tomography (CT). a The anterior gap is measured at the most medial part of the tibial tubercle and b the posterior gap is measured at the most medial and posterior height of the osteotomy site using the CT sagittal viewBack to article page