We evaluated the effect of ventralization of the tibial tuberosity in 34 patients (42 joints) who underwent hight tibial osteotomy (interlocking wedge osteotomy). An effective ventralization of the tibial tuberosity was not obtained in the majority of patients due to posterior displacement of the proximal fragment and the increase in the ratio of tibial posterior displacement was correlated with postoperative decrease in tibial posterior declining angle. It was considered that the decrease in the angle resulted in correction of flexion contracture at the time of surgery.
In high tibial osteotomy, the decrease of tibial posterior declining angle results in decrease of the effective ventralization. If ventralization of distal fragment is not performed in the case combined patello-femoral arthrosis, pressure of the joint may increase and develop patello-femoral arthrosis.
