Factors Influencing Range of Motion after Total Knee Arthroplasty


H Farahini 1 , M Moghtadaei 2 , * , A Bagheri 1 , E Akbarian 3

1 Department of Orthopedics Surgery, Rasule-Akram General Hospital, Tehran University of Medical Sciences, Iran

2 Assistant Professor of Orthopedic Surgery, Fellowship of Knee Surgery, Rasule-Akram General Hospital, [email protected], Iran

3 Department of Public Health, Karolinska Institute, Sweden

How to Cite: Farahini H, Moghtadaei M, Bagheri A, Akbarian E. Factors Influencing Range of Motion after Total Knee Arthroplasty, Iran Red Crescent Med J. Online ahead of Print ; 14(7):417-421.


Iranian Red Crescent Medical Journal: 14 (7); 417-421
Article Type: Research Article
Received: October 12, 2011
Accepted: December 25, 2011




Background: The range of motion after a total knee arthroplasty is an important clinical outcome affecting the life of the patient. The aim of this study was to determine the most important factors influencing the postoperative knee flexion in Tehran, Iran.


Methods: Between July 2007 and January 2009, on 95 cases of total knee joint replacement (89 patients), who were followed for 1 year postoperatively, the risk factors were assessed. Patient demographics (sex, age, body mass index, previous surgery, preoperative Knee Society System score, and preoperative range of motion) as well as radiographic measurement for preoperative tibiofemoral angle were statistically analyzed and the probable predictors entered into a linear regression model.


Results: Univariate analysis showed that age, preoperative flexion angle, preoperative flexion arc and preoperative tibiofemoral angle had significant correlation with the postoperative flexion angle. The linear regression model on the other hand revealed that preoperative flexion angle and preoperative tibiofemoral angle were the true predictors of the postoperative flexion angle with coefficients of 0.64 and -0.21, respectively.


Conclusion: Better range of motion before the surgery with a lower tibiofemoral varus/valgus angle were more likely to result in a better range of motion after the surgery, suggesting that an appropriate timing for the surgery when the knee joint is still in a better function can lead to a better outcome.


Arthroplasty Motion Flexion Knee

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