Results with eight and a half years average follow-up on two hundred and eight e-Motion FP® knee prostheses, fitted using computer navigation for knee osteoarthritis in patients with over ten degrees genu varum

Purpose The aim of this study was to analyse the clinical and radiographic results of 208 e-Motion (R) posterior cruciate-retaining, mobile bearing prostheses (BBraun-Aesculap, Tuttlingen, Germany) fitted using computer navigation, for knee osteoarthritis with a genu varum greater than 10 degrees. Methods One hundred ninety-two patients were operated on with 208 e-Motion (R) prostheses fitted, between January 2006 and December 2011, using the OrthoPilot (R) computer navigation system. Average pre-operative IKS score was 70 +/- 27 points (6-143) with a function score of 38 +/- 20.5 (0-90) and a knee score of 32.5 +/- 13 (0-63). Average flexion was 116.5 degrees +/- 13 degrees (65-140 degrees). Average pre-operative HKA angle was 166 degrees +/- 3 degrees (154-169 degrees). Results 2Results are available for 134 patients, with a total of 150 knees operated on (38 lost to follow-up and 20 deceased). Average follow-up was 104.5 months (60-116 months). On last follow-up, the average IKS was 180 +/- 22 points (95-200) with 86.5 +/- 16 points (25-100) for the function score and 93.5 +/- 8 points (55-100) for the knee score. Knee flexion was 116 degrees +/- 10.5 degrees (80-135 degrees) and average HKA angle was 179 degrees +/- 2 degrees (175-184 degrees). The pre-operative objective was achieved in 90.5% of knees. Conclusion The e-Motion (R) mobile bearing posterior cruciate-retaining prosthesis, fitted using computer navigation, offers excellent results after an average of 8.5 years follow-up. These results are at least equivalent, even superior, to those of the posterior-stabilised prostheses usually used for this type of deformity.