Factors affecting knee flexion in primary total knee arthroplasty

Nilay Chhasatia, M Ravikumar, D Dhanalakshmi

Astrocyte 2016 3(3):139-141

Background: The two main measures of a successful primary total knee arthroplasty (TKA) are relief from pain and increase in the range of motion. Because the lifestyle in the Indian subcontinent requires bending of knee beyond 90° during the course of numerous daily chores, the range of knee flexion achieved following surgery is an important clinical outcome measure. This outcome can, however, be influenced by several variables. Objective: This study tried to analyze the possible difference in the postoperative knee flexion among patients undergoing primary TKA and establish the interrelationship among different covariates. Materials and Methods: Thirty-three patients of primary TKA were recruited in the study. Newly operated cases were followed up till 6 months postoperatively. Knee flexion as a part of knee society scoring was carried out as a part of the follow-up. The results obtained were suitably analyzed using the standard statistical tools. Results: Knee flexion in patellar resurfaced post-TKA group (114.17 ± 9.42; P = 0.01) was significantly higher than that in patellar nonresurfaced post-TKA group. Patients who were used to employing some kind of support while negotiating stairs had significantly worse pain scores (41.11 vs. 48.33; P = 0.007] and reduced knee flexion (105.56 vs. 119.17; P = 0.001) compared to those who did not use any support. Compared to males, females were more likely to use support while negotiating stairs (Wald chi square = 4.151, P = 0.04 OR = 8.0). Among all post-TKA patients, males were found to have a greater degree of knee flexion than females (120 vs. 105.37; P = 0.002). No significant difference in knee flexion was observed among age groups and type of arthritis or side of the operated knee. Conclusions: Patellar resurfacing and male sex was associated with a greater degree of post-TKA knee flexion in the study participants.

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