Abstract
Several factors can be involved in evaluating a motion analysis system. The purposes of this study were to evaluate: 1) the accuracy, repeatability, and linearity of the Skeletal Analysis System (Metrecom System) and 2) the reliability of bony landmark identification with a method using the Metrecom Skeletal Analysis System (Metrecom Method) to obtain coordinates for human skeletal landmarks. A calibration control object with 20 known three-dimensional coordinates in a rectangular field was used as the gold standard for evaluating the Metrecom System for measuring X, Y, and Z spatial coordinates. The Metrecom Method was then evaluated using a test-retest approach for 10 bony landmarks on each of 10 normal subjects examined by two different examiners. Relative to the Metrecom System, the results demonstrated that the hysteresis was minimal (1.8 mm), and linearity was excellent. The differences between the true and measured distances for the 20 known points were not statistically significant (p >/= .05). The variability for any point within the field of measurement was homogeneous (p </= .05). The accuracy (average difference between known and measured points) of the Metrecom System was found to be 2.7 mm. Repeatability in terms of the stability of the Metrecom System as indicated by deviations along the X, Y, and Z axes was .22, .57, and .31 mm, respectively. The results involving the Metrecom Method showed that the intraexaminer and interexaminer differences were not statistically significant (p >/= .05). The mean intrarater reliability (ICC) for identification of coordinates for 10 bony landmarks was .95 for one examiner and .96 for the other examiner. The mean interrater ICC was .87, with all coefficients being above .80. In conclusion, use of the Metrecom System is affected by controllable human factors, in which case valid and reliable measurements for skeletal landmarks can be obtained. J Orthop Sports Phys Ther 1992;16(4):182-188.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Orthopaedic & Sports Physical Therapy
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
