Evaluation of Accuracy of Preoperative Planning of the Femurofibular Angle in Open-Wedge High Tibial Osteotomy for Mild Medial Knee Osteoarthritis

Figure 5

A 56-year-old female patient with medial compartment osteoarthritis of the left knee underwent OWHTO. (a) The primary mechanical axis and targeted corrective mechanical axis (55%) and (57.5%) from the medial border of the tibial plateau surface on the full-length anteroposterior radiograph of the lower limb were marked. (b) The preoperative simulation of OWHTO according to the mechanical axis and the FFA was 87°. (c) The simulation of OWHTO according to the mechanical axis and the FFA was 90°. (d) Arthroscopy showed an intact meniscus and cartilage in the lateral compartment and degeneration in the medial compartment. (e) Intraoperative osteotomy was carried out until the FFA was in the range of preoperative planning of 87–90° (88.5° in this case). (f) After fixing the plate in position, the FFA was measured again, and it was 88.5°. (g) The FFA was 88.5° and the mechanical WBL was 57.2% at 18-month follow-up, which is consistent with the values of preoperative planning and intraoperative setting.

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