PRIMARY TOTAL KNEE ARTHROPLASTY FOR SEVERE VALGUS DEFORMITY: A 2YEAR FOLLOW-UP STUDY AT HASAN SADIKIN HOSPITAL

Valgus deformity (VD) accounts for only 10% of total knee arthroplasties (TKAs), but is frequently considered the most challenging to manage. The aim of this study was to review outcome of primary total knee arthroplasty for severe valgus deformity at Hasan Sadikin Hospital, Bandung. METHODS: From January 2015 and December 2017 consecutive patients undergoing unconstrained primary total knee arthroplasty with severe VD, grade II and III were enrolled in a prospective observational cohort study. Preoperatively, at 6 weeks, and 2 years after surgery, patients completed the Knee Injury and Osteoarthritis Outcome Score (KOOS), the Oxford Knee Score (OKS), and the Knee Society Score (KSS, 2011, modified version). Femorotibial angle were measured on the frontal standing X-rays. RESULTS AND DISCUSSIONS: There were twenty-four patients (18 women, 6 men) with mean age of 66 years (55 - 80). The knee range of motion improved from a mean of 71 degrees preoperatively to a mean of 95 degrees. KOOS Quality of life had increased significantly 6 weeks – 2 years after surgery. KOOS pain mean score was 40.3 points before surgery and increased significantly to 86.6 at two year follow up. OKS mean score increased from 22.1 to 41.8 two years after surgery. KSS 2011 mean objective score increased from 22 to 96 and mean function score increased from 32 to 81 two years after surgery. The mean femorotibial angle were improved from valgus 32.72º±9.68º pre-operation to 4.89º±0.90º post-operation (P <0.001). CONCLUSION: Primary total knee arthroplasty can be effective and safe for severe valgus deformity and the clinical results up to two years after surgery are promising. As our results show, if proper ligament balancing techniques are used and proper ligament balance is attained, the knee may not require the use of a more constrained components.