Clinical outcome of 100 total knee replacements using Persona posterior stabilized knee implant- A prospective observational study

Abstract

Background: Total knee arthroplasty is a well accepted treatment for managing end-stage symptomatic osteoarthritis of knee. Many designs of prostheses have evolved over a period of time with almost similar clinical outcomes. The aim of this study was to evaluate the functional outcome of total knee arthroplasty using persona posteriorly stabilized knee implant (Zimmer, Warsaw, Indiana) and to investigate the effect of pre operative range of motion of involved knee on final range of motion and to observe the trends in the post op range of motion of the knee after total knee Arthroplasty. Methods: This was a prospective, observational study involving 100 total knee replacements in 60 patients using Persona Posterior Stabilised Knee Implant system. All patients were assessed clinically and radiologically with respect to the improvement of function and range of motion of knee joint, grading of pain, daily routine activity modification and generalized wellbeing after surgery and Knee society score was calculated. Results: During the study period, 3 patients died on follow up (due to multiple comorbidities) and one patient underwent revision surgery for late infection, all of them had underwent unilateral knee replacement. Knee Society Score, and knee range of motion of 96 knees in 56 patients was assessed preoperatively and postoperatively at 3 months, 6 months, 1 year, 2 years and 3 years. There was a significant improvement in mean KSS, FS and Pain score post operatively upto 1 yr with no significant improvement thereafter. Range of motion reduced significantly 3 months post op with a significant improvement thereafter at 6 months and 1 year. Furthermore patients with less pre op ROM gained significantly more ROM than the patients with better pre op ROM. Conclusion: Persona posteriorly stabilized knee show good functional outcome at 3 years follow up period and post operative range of motion of the knee, functional score and knee society score show improving trend with significant improvement upto 1 yr.