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- Title
Rotational knee laxity: reliability of a simple measurement device in vivo.
- Authors
Tsai AG; Musahl V; Steckel H; Bell KM; Zantop T; Irrgang JJ; Fu FH; Tsai, Andrew G; Musahl, Volker; Steckel, Hanno; Bell, Kevin M; Zantop, Thore; Irrgang, James J; Fu, Freddie H
- Abstract
<bold>Background: </bold>Double bundle ACL reconstruction has been demonstrated to decrease rotational knee laxity. However, there is no simple, commercially-available device to measure knee rotation. The investigators developed a simple, non-invasive device to measure knee rotation. In conjunction with a rigid boot to rotate the tibia and a force/moment sensor to allow precise determination of torque about the knee, a magnetic tracking system measures the axial rotation of the tibia with respect to the femur. This device has been shown to have acceptable levels of test re-test reliability to measure knee rotation in cadaveric knees.<bold>Methods: </bold>The objective of this study was to determine reliability of the device in measuring knee rotation of human subjects. Specifically, the intra-tester reliability within a single testing session, test-retest reliability between two testing sessions, and inter-tester reliability were assessed for 11 male subjects with normal knees.<bold>Results: </bold>The 95% confidence interval for rotation was less than 5 degrees for intra-tester, test-retest, and inter-tester reliability, and the standard error of measurement for the differences between left and right knees was found to be less than 3 degrees .<bold>Conclusion: </bold>It was found that the knee rotation measurements obtained with this device have acceptable limits of reliability for clinical use and interpretation.
- Publication
BMC Musculoskeletal Disorders, 2008, Vol 9, p35
- ISSN
1471-2474
- Publication type
journal article
- DOI
10.1186/1471-2474-9-35