Objective: High tibial osteotomy could change the anatomy of the knee and there may be technical difficulties while performing the surgery and thus dissatisfaction with the clinical results. The purpose of this study is to compare the clinical and radiological results between primary TKA and TKA after HTO.

Material and Method: Between 2001 and 2019 we evaluated 26 patients who were performed total knee arthroplasty with a history of previous high tibial ostetomy. This group was compared with 26 patients with similar age, body mass index (BMI), follow-up time and prosthesis design from remain primary total knee arthroplasty (p-TKA). All patients were evaluated clinically according to range of motion (ROM), Knee Society Score (KSS), Knee Society Score-Function (KSSF), The Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), preoperatively and postoperatively. Radiologic assesments were evaluated pre- and postoperatively by antero-posterior and lateral X-ray view, and orthoroentgenogram. Femorotibial angle (FTA), tibial slop and Insall-Salvati ratio were compared in both groups.

Results: In HTO group all 26 patients were female (100%) while in p-TKA group there were 19 female (73.1%)and 7 male (26.9%) patients. The mean age was similar (HTO = 65,7; p-TKA=65,2). Total follow-up time was 52 months in HTO group; 55 months in p-TKA group. The mean time interval between HTO and TKA was 125 ± 22 (45-192) months. There were no significant difference between the groups regarding preoperative demographic or clinical data.

Conclusion: The main finding of this study was that, both primary TKA and TKA after HTO had similar clinical and radiological results.