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Varus inclination of the distal femur and high tibial osteotomy

Department of Orthopaedic Surgery, Faculty of Medicine, Gunma University, 3-39-22 Showa, Maebashi 371-8511, Japan.

M. Kimura, MD, DMSc, Director

Gunma Sports Medicine Research Centre, Zensyukai Hospital, 1381 Ninomiya, Maebashi 379-2122 Japan.

Correspondence should be sent to Dr M. Terauchi.

We have analysed retrospectively the relationship between the axial parameters of alignment of the lower limb and the recurrence of varus deformity after high tibial osteotomy. We studied 29 patients (37 knees) with a mean age at surgery of 66 years. The mean follow-up was for 7.4 years (5 to 10.5). Recurrence of varus deformity was defined as an increase in the femorotibial angle of 3° or more, compared with that obtained six months after the operation. There were four patients (four knees) with recurrence of varus deformity. They had a greater varus inclination of the distal femur than those without varus recurrence.

An association between varus inclination of the distal femur and horizontal obliquity of the joint surface was observed. Excessive obliquity prevents the shift of weight-bearing to the lateral compartment, and may cause a recurrence of varus deformity after high tibial osteotomy.