Functional outcome of mobile bearing total knee arthroplasty a minimum of 5 years follow up study

AIMS: To evaluate clinical, functional and radiological outcome following mobile bearing TKR performed in Department of Orthopaedics Christian Medical College, Vellore, for a follow up period of 5 years or more. OBJECTIVES: To assess post op infection, To calculate duration of stay in hospital, To assess BMI, To assess need for Blood transfusion, To assess range of movement, To assess posterior condyle offset, To assess joint line, To assess alignment, To assess pain, To assess functional outcome with knee society score. METHODS: Retrospective observational study. Patients who had undergone mobile bearing TKR between 2001 and August 2009 were recruited into the study after informed consent. They were informed by telephone and post, to come for follow up in Ortho OPD. Their current clinical and functional scoring was calculated using the Knee Society Score. Plain Radiograph of knees, AP & lateral views were taken at the follow up visit and radiological assessment of the joint was done .Their pre op American Knee society score was obtained from the Inpatient chart of their admission for the operation. Other variables like Age of the patient, sex, occupation, duration of hospitalisation were also analysed during the follow up visit. RESULTS AND CONCLUSION: Age increase showed a decrease in Knee Society Score and Functional Score, but no statistical significance was found. BMI was associated with decreased Knee Society Score and Functional score, but it was not statistically significant. BMI and mobility had shown poorly significant negative correlation. There was considerable improvement in the American Knee Society Score and functional score post operatively. No correlation between posterior condyle offset and knee range of movement or knee society score was found. There was significant elevation of the joint line post operatively. Very few patients developed erythema, redness and resolved after treatment with intra venous antibiotics