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ORIGINAL ARTICLE
Year : 2014  |  Volume : 7  |  Issue : 1  |  Page : 78-83

Does pre-operative flexion factor influence the post operative range of motion in total knee arthroplasty


Department of Orthopaedics, Sri Ramachandra Medical College (SRMC), Porur, Chennai, Tamilnadu, India

Correspondence Address:
Ganesh Babu Natarajan
B2 Private Clinic, Department of Orthopaedics, Sri Ramachandra University, Porur, Chennai - 600 116, Tamilnadu
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0975-7341.134025

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Background: Range of motion and flexion are important outcome measures following total knee arthroplasty. Many of the activities of daily living require knee flexion in the range of 45 to 105°. Several factors affect postoperative range of motion (ROM), including pre-operative and post operative factors, among which pre-operative ROM is the most important factor. Aim: To analyze the patient's pre-operative flexion factor responsible for the outcome of range of motion in post operative Total Knee Replacement (TKR). Materials and Methods: We studied 80 patients having Total Knee Replacement (TKR) by a single surgeon in SRMC, Chennai, between 2005 and 2010 with a minimum follow up of upto 1 year. Results: The mean pre-operative flexion was 85° and post operative mean flexion was 115°. Obesity is associated with poor flexion after TKR. Knees with Rheumatoid arthritis started with a lesser flexion (80°) than those with Osteoarthritis (90°) and the change in flexion score has shown a significant difference of 40 and 20°, respectively. Average post operative range of motion for patient with pre-operative ROM <90° was 110° flexion, whereas in patients with pre-operative ROM >90° flexion, the average post operative ROM was 120° flexion. This shows, the gain in flexion is more in patients with <90° than those with >90° pre-operative flexion. Conclusion: Yes, the pre-operative flexion significantly influenced the post operative flexion and it is a good parameter for predicting the post operative outcome.


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