Total knee arthroplasty following high tibial osteotomy - a radiological evaluation

The purpose of this study was to evaluate the results of total knee arthroplasty (TKA) following a closed wedge high tibial osteotomy (HTO). A total of 16 TKAs were performed in 16 pacients who had previously undergone a closed wedge (HTO) as a treatement for knee osteoarthritis. The radiographic results were evaluated with respect to the femurotibial angle (FTA), joint line height (JLH), tibial bone resection and Insall-Salvati ratio. The FTA improved in average, from 6.5 degree of varus preoperatively at 5.7 degree of valgus postoperatively. The JLH averaged 14.34 mm preop and 13.81 mm at the last follow-up. The amount of tibial bone resection averaged 5.98 mm, face to 7.5 mm for knees without HTO. The Insall-Salvati ratio was 1.127 preop and 1.172 postop. A meticulous surgical technique may lead to satisfactory results in TKA after HTO, considering the correction of the deformity, the re-estabilish of JLH and the amount of the tibial bone resection.