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Rotational knee laxity: Reliability of a simple measurement device in vivo

BACKGROUND: 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...

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Detalles Bibliográficos
Autores principales: Tsai, Andrew G, Musahl, Volker, Steckel, Hanno, Bell, Kevin M, Zantop, Thore, Irrgang, James J, Fu, Freddie H
Formato: Texto
Lenguaje:English
Publicado: BioMed Central 2008
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2315651/
https://www.ncbi.nlm.nih.gov/pubmed/18366671
http://dx.doi.org/10.1186/1471-2474-9-35
Descripción
Sumario:BACKGROUND: 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. METHODS: 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. RESULTS: The 95% confidence interval for rotation was less than 5° 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°. CONCLUSION: It was found that the knee rotation measurements obtained with this device have acceptable limits of reliability for clinical use and interpretation.