Effects on Lateral Knee Joint Opening Angle in High Tibial Osteotomy

概要

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High tibial osteotomy (HTO) is one of the common surgical procedures used to correct axial malalignment and pathomechanics of the knee. But it is not easy to decide the correct angle of osteotomy. We have noticed that lateral joint opening angle (LJOA) in standing position changes after HTO. LJOA is the angle made between the line connecting bilateral condyles and that connecting bilateral tibial plateaus in antero-posterior roentgenogram. The purpose of this study is to determine the factors which effect the change of LJOA. The results indicate that LJOA of preoperative standing position is 3.6 degrees larger than that of the postoperative standing position. The size of change of LJOA in standing position has relation to the size of preoperative LJOA in standing position. And LJOA of postoperative standing position is almost equal to that of preoperative supine position. This suggests that the correct angle in HTO had better been determined in the preoperative X-ray film of supine position, especially in the case which has large LJOA in preoperative standing position.
西日本整形・災害外科学会の論文