Effect of the amount of correction on posterior tibial slope and patellar height in open-wedge high tibial osteotomy

Objectives: To evaluate the effect of amount correction on postoperative changes in PTS (posterior tibial slope), PH (patellar height), and clinical outcomes following biplanar OWHTO (open-wedge high osteotomy). Method: This study included 79 knees (32 left 47 right) patients (mean age 60.28 ± 4.2 years, 24 males, 55 females) with varus malalignment symptomatic isolated medial joint osteoarthritis who underwent OWHTO. According to angles, all were divided into three groups: LCA (large angle) group (>14°), MCA (medium (10°–14°), SCA (small (<10°). All clinically assessed according Lysholm score, HSS (hospital for special surgery knee score), KSS (knee society score) prior after surgery. For radiographic analysis, we measured PTS, [ISI (Insall-Salvati index), BPI (Blackburne-Peel index)]. The pre-post difference ISI, was calculated by subtracting post-OWHTO value pre-OWHTO groups, respectively. preoperative, postoperative, values analyzed angle. mean follow-up period 28.5 months (SD, 4.9; range 18–52 months). Results: Radiologically, increased decreased whole ( p < .05). relationship between slope increase is significant .001). Furthermore, pairwise respectively In terms PH, yielded ISI that significantly different from baseline group. addition, = .031). Clinically, improvements observed scores HSS, Seventy-four (93.67%) reported satisfaction However, no correlation found score. No severe adverse complications observed. Conclusions: angle a factor affecting With angle, likelihood increasing decreasing increases. Special attention should be paid keep unchanged cases where large corrections are required. Otherwise, closing wedge osteotomy or other intraoperative effective measures supposed adopted.