IS iASSIST SUPERIOR TO CONVENTIONAL METHOD IN TOTAL KNEE REPLACEMENT FOR FUNCTIONAL OUTCOMES?PROSPECTIVE OBSERVATIONAL STUDY IN INDIAN POPULATION FOR OXFORD KNEE SCORE, SF 12 AND KNEE SOCIETY SCORE.

Abstract

Background: The iASSIST (Zimmer) system is an accelerometer base navigation tool use for total knee arthroplasty (TKA) which guides surgeon to take bone cuts during surgery. The purpose of this study was to compare the functional outcome between accelerometer base iASSIST system and the conventional system. Method: A prospective study between two groups of 28 patients (14 iASSIST and 14 conventional) of primary osteoarthritis of the knee who underwent TKA using Zimmer iASSIST ™ or conventional method from January 2018 to December 2019. A single surgeon performs whole operations with the same instrumentation and same surgical approach. Pre-operative and postoperative management protocol are same for both groups. Preoperative oxford knee score, SF12 and Knee society score was taken 1 week prior to surgery and postoperative scores was taken 3 weeks after surgery. Results: There was no difference between the two groups for age, height and weight (p > 0.05). No significant difference was observed in SF 12(Physical and mental score),OKS and knee score preoperatively and postoperatively . Significant difference was observed in knee society functional score preoperatively and postoperatively between 2 groups but no significant difference was observed in difference of score. Significant correlation observed in preoperative short form(SF)12 physical component score (PCS) and preoperative oxford knee score. Conclusion: Our study concludes that despite being a useful guidance tool during TKA, iASSIST does not show any difference in functional and satisfaction outcomes when compared with the conventional method.