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[Purpose] The purpose of this study was to verify the validity of two-dimensional motion analysis using three-dimensional motion analysis in the measurement of the pelvic obliquity angle and the hip abduction/ adduction angle during gait. [Subjects] Twenty-one healthy subjects gave their informed consent to participation in this study. [Methods] To examine the validity of the pelvic obliquity angle and the hip abduction/adduction angle at right heel contact and left toe-off, intraclass correlation coefficients were calculated and Bland-Altman analysis was performed. Furthermore, we confirmed the causes of differences between measurements using multiple regression analysis. [Results] With the exception of hip abduction/adduction using the patellar center as a landmark, the intraclass correlation coefficients ranged from 0.67 to 0.93. Also, for the pelvic obliquity angle at the right heel contact, a fixed bias arising from pelvic antero-posterior tilt was found. [Conclusion] We conclude that the relatively high validity of two-dimensional motion analysis was verified using three-dimensional motion analysis of gait in the frontal plane.

rigaku ryōhō kagaku/rigaku ryoho kagaku

Verification of the Validity of Two-dimensional Motion Analysis for the Measurement of the Pelvic Obliquity Angle and the Hip Abduction/Adduction Angle during Gait