Studies on the alignment after high tibial osteotomy. Change in the knee joint space.:Change in the Knee Joint Space

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The alignment of the knee and the change in the joint space were evaluated in 26 knees after high tibial osteotomy for varus osteoarthrosis of the knee. Femoro-tibial angle (FTA), passing poit of Mikulicz line (ppM) and lateral opening angle (LOA) were measured for this evaluation. LOA is the angle which is made between the line connecting bilateral femoral condyles and the line connecting bilateral tibial plateaus in A-P view. LOA of postoperative standing view in all except 2 knees decreased as compared with that of preoperative standing view. All knees corrected under 166° (FTA) or over lateral 50% (ppM) decreased over 2° in LOA. LOA of postoperative standing view were almost equal to that of preoperative supine view. The change in LOA between preoperative standing view and postoperative standing view correlated the preoperative joint instability. This suggests that the correct angle in high tibial osteotomy had better be determined from the preoperative A-P view of supine position especially in the case with joint instability, and that best corrective alignment was about 166° (FTA) or lateral 50% (ppM).
西日本整形・災害外科学会の論文