Abstract
We report a case of pseudoachondroplasia with moderate tibia vara which was treated by oblique proximal tibial osteotomy described by Wagner. She was diagnosed with pseudoachondroplasia at the age of 5. During regular follow-up, for a few years, the varus deformity of the knee progressed gradually, so that the femora-tibial angle (FTA) at the age of 9 was 206°, and she started to complain of bilateral gonalgia.
Oblique osteotomy was performed at the level of the proximal tibial metaphysics distal to the tibial tubercle. Considering recurrence of the varus deformity during the growing stage, the FTA was overcorrected to 168° on the right side and 167° on the left side postoperatively compared with 206° on the right and 210° on the left preoperatively.
The obliquity of the osteotomy line allowed it to be placed within the proximal tibial metaphysics without damaging the proximal tibial physics or tibial tubercle, and the osteotomy also allowed rigid internal fixation with AO compression plate permitting weight bearing in the early postoperative period.
For such reasons, osteotomy is considered to be a suitable technique for the varus deformity of the proximal tibia in growing patients.
