Figure 4

70-year-old woman in the OWHTO group. A. Prior to OWHTO, a medial compartmental grade 2 OA was diagnosed. The FTA was 182° and the KSS was 60. B. Two weeks after OWHTO, the FTA was corrected to 170°. C. Two years and 6 months after OWHTO, the FTA was maintained at 170° and there was no correction loss. This patient could subsequently sit with full flexion and the KSS improved to the excellent range.