Short term outcome comparative study of total knee arthroplasty, rotating platform (mobile bearing) versus fixed bearing (congruent) knee designs

Abstract

Background: Various long term studies have been done independently on both Rotating platform and fixed bearing prosthesis, but only few studies, are available comparing the two prosthesis, hence this study has been done to compare Rotating platform (mobile bearing) versus Fixed bearing in patients undergoing total knee arthroplasties, with regard to clinical and radiographic outcomes. Method: This randomized prospective study aims to compare the effectiveness and efficiency of a standard Rotating platform(mobile bearing) versus Fixed bearing prosthesis in primary TKA, and to evaluate clinical and radiological outcome, in consecutive primary osteoarthritis patients getting admitted for primary TKR at our hospital. We included 32 patients (16 in each group) who were randomly selected, operated and both the groups were followed in prospective manner for 1 year and data collected was assessed by statistical methods. Results: The mean knee society knee scores in fixed bearing and mobile bearing total knee replacement, at the end of 1 year were 91.75 and 92.12 respectively and the mean knee society function scores in fixed bearing and mobile bearing total knee replacement, at the end of 1 year were 79.06 and 79.37 respectively in our study P VALUE (ns<0.05). Discussion: We conclude that there was no significant statistical difference in clinical, functional and radiological out come in both fixed bearing and mobile bearing prosthetic designs. Our study has shown that using a fixed-bearing or a mobile-bearing design, when all the other variables are controlled, did not seem to influence the outcome in short-term follow up.

Keywords

• Total knee arthroplasty
• rotating plate
• fixed bearing
• clinical outcome