Abstract
Purpose of the study
Assessing medium term outcome of medial Uni compartmental replacement and whether there is a difference in outcome between mobile and fixed bearing variants of the same prosthesis.
Methods
Knee outcome was assessed in 150 patients (81 male, 69 females, mean age 67.0±10.4yrs) undergoing medial UKR knee (Uniglide, Corin Medical, UK) using either fixed or mobile bearing prosthesis between 2002-2007. All operations were performed by members of the Bristol knee group. All patients were scored using the American Knee Score (AKS), Oxford Knee Score (OKS), and WOMAC pre-operatively and at 2-year follow up. The mobile group (n=93) comprised 43 males and 50 females, aged 62.8±8.9yrs. The fixed bearing group (n=57) comprised 38 males and 19 females, aged 74±8.8yrs.
Results
Pre-operative measures of AKS, OKS, and WOMAC did not significantly differ between mobile and fixed bearing groups (p>0.05) with scores in the range of 111-113 out of 175, 19.6 out of 48, and 36.7-37.5 out 60, in the AKS, OKS, and WOMAC respectively. Two-year follow up scores for AKS, OKS, and WOMAC demonstrated a significant (p<0.0001) improvement in function with scores ranging from 167-171, 33.1-34.5, and 23.3-24.8 points respectively. No significant difference was observed at 2-year follow up between mobile or fixed bearing groups (p>0.05).
Discussion
Two-year follow up outcome scores demonstrated a significant improvement in patient function for both fixed and mobile bearing prostheses compared with pre-operative scores, with no differences in outcome observed between mobile or fixed bearing devices.
