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Surface Topographic Measurement Method for Assessing Lower Extremity Alignment: Examination on a novel clinical and research Tool  

Yim, Ji-Young (건양대학과 물리치료학과)
Yim, Hyun-Seung (건양대학과 물리치료학과)
Park, Dae-Sung (건양대학과 물리치료학과)
Lee, Na-Kyung (아주대학교의료원 정형외과학교실)
Lee, Na-Kyung (건양대학과 물리치료학과)
Publication Information
Journal of rehabilitation welfare engineering & assistive technology / v.10, no.1, 2016 , pp. 37-45 More about this Journal
Abstract
The purpose of this study was to assess the intra-rater, inter-rater and test-retest reliability and validity of frontal plane lower extremity alignment estimated from a rasterstereographic method using ABW-Mapper. Eighteen subjects participated in this study. The S angle (stereographic angle-frontal plane lower extremity alignment estimated from a rasterstereographic method) in standing was measured throughout the two sessions with one week interval by two different readers. In the first session, a reader measured S angle twice per subject with a short break in-between. The Q-angle (quadriceps angle) was measured using a standard goniometer from a photography taken through digital camera with the participant standing in the same position as in the S angle measurement. The HKA(hip-knee-ankle) angle was measured from a computer based digital radiograph with the computerized measurement software. Reliability was tested using intraclass correlation coefficients(ICC). Validity was tested using a Pearson's correlation coefficient. Excellent intra-rater(ICC=0.956~0.974), inter-rater(ICC=0.962), test-retest reliability (ICC=0.945) were demonstrated. There were strong negative correlations between S angle and Q-angle (r=-0.739), and between S angle and HKA angle (r=-0.702). Therefore, the S angle measured using a rasterstereographic mapper may be used to as a preliminary or supplementary tool to evaluate and study LE alignment in the frontal plane in relation to HKA angle or Q-angle.
Keywords
lower extremity alignment; measurement; rasterstereography; quadriceps angle; hip-knee-ankle angle;
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