EFFECT OF COMPONENT ROTATIONAL ALIGNMENT ON FEMORO-TIBIAL ROTATIONAL ALIGNMENT IN TOTAL KNEE ARTHROPLASTY

Rotational Alignemnt is goof dor functional outcome and long term success of Total Knee Arthroplasty. Malalignment causes- 1)Patellofemoral complications such s Subluxation, Dislocation, Wear and tear. 2)Abnormal internal and external alignment can cause instability, implant loosening and unexplained painful total knee arthroplasty.. Achieving correct femoro-tibial rotation is difficult with both conventional and navigation systems. Alignment errors after TKA has led to rigorous evaluation of surgical techniques. Alignment in trnasverse plane is problematic due to- 1)Errors of component malalignemnt relative to bone anatomical landmark 2)Mismatch between femoral and tibial components relative position. Both resulting in small rotational errors.

This prospective study evaluates whether component malalignement and mismatch affects the axial rotation motion during passive knee flexion after total knee arthroplasty

This is a prospective study is on the patients that are admitted in Acharya Vinoba Bhave Rural Hospital, Sawanghi(Meghe) that are willing to undergo Total Knee Arthroplasty between June 2025 and December 2027.

Consecutive sampling method will be used. A total sample size of 45 knees will be taken into account using formula developed by William G. Cochran

Postoperative assessment of rotational alignment will be evaluated using CT scan. Femoral component alignment relative to Surgical Transepicondylar axis. Tibial component alignment relative to Akagi’s line.

Postoperative femorotibial rotation on passive flexion of knee will be assessed using Xray Radiography

Functional outcome scores using KSS score, WOMAC score will be done to assess pain and limitations following TKA

Bases on the results of CT scan the participants will be categorised into nominal group(Femoral component rotation <3, Tibial component rotation <10, Femorotibial rotation <5) and Outlier group(Femoral component rotation >3, Tibial component rotation >10, Femorotibial rotation >5)

Statistical Analysis will be done using

Descriptive statistics

Test for normalcy using Shapiro Wilk Test, Histogram, Q-Q plots

Inferential statistics using Independent t-test/Mann Whitney U test, One way ANOVA, Chi-Square test, Pearson/Spearman correlation coefficient

A p-value <0.005 will be considered significant

This study seeks to improve functional outcomes, patient satisfaction, implant longevity in total knee arthroplasty by addressing one of its most common yet underevaluated causes of failure; rotational malalignment