![]() ![]() The ability to differentiate between subjects ranged from 0.62 for measurement of passive extension to 0.89 for measurements of active flexion (ICC values). The highest levels of agreement were found for measurement of passive flexion with the patient in sitting position and for measurement of passive extension (mean difference 2.7° limits of agreement -6.7 to 12.1 and mean difference 2.2° limits of agreement -6.2 to 10.6 degrees, respectively). The lowest level of agreement was that for measurement of passive flexion with the patient in supine position (mean difference 1.4° limits of agreement 16.2° to 19° for the difference between the two observers. The intraclass correlation coefficient (ICC) was calculated as a measure of reliability, based on two-way random effects analysis of variance. Main outcome measure: RoM measurement using a long-arm (50 cm) goniometerĪgreement was calculated as the mean difference between observers ± 95% CI of this mean difference. Participants: Two experienced physical therapists assessed 30 patients, three days after total knee arthroplasty. Setting: University hospital departments of orthopaedics and physical therapy The objective of the present study was to assess interobserver reproducibility (in terms of reliability and agreement) of active and passive measurements of knee RoM using a long arm goniometer, performed by trained physical therapists in a clinical setting in total knee arthroplasty patients, within the first four days after surgery. ![]()
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