This article and any supplementary material should be cited as follows: Sung PS, Kim YH. Kinematic analysis of symmetric axial trunk rotation on dominant hip. J Rehabil Res Dev. 2011;48(8):102936. DOI: /JRRD Kinematic analysis of symmetric axial trunk rotation on dominant hip Paul S. Sung, PhD, DHSc, PT; Yoon Hyuk Kim, PhD This article and any supplementary material should be cited as follows: Sung PS, Kim YH. Kinematic analysis of symmetric axial trunk rotation on dominant hip. J Rehabil Res Dev. 2011;48(8):102936. DOI: /JRRD Study Aim Use three-dimensional motion analysis to measure movements of bilateral hips and lumbar spine in nondisabled participants performing axial rotation activities while standing. Relevance Axial rotation of trunk is significant risk factor for low back pain. No biomechanical investigation has explained how twisting is accomplished with simultaneous asymmetric handling between hip joints and lumbar spine. This article and any supplementary material should be cited as follows: Sung PS, Kim YH. Kinematic analysis of symmetric axial trunk rotation on dominant hip. J Rehabil Res Dev. 2011;48(8):102936. DOI: /JRRD Axial Rotation Test (a)Participant stands with legs extended with stick bar and performs axial rotation activities 5 times. (b)During testing, participant maintains standing stability while reflective markers collect kinematic data from x (frontal), y (sagittal), and z (transverse) spine axes. This article and any supplementary material should be cited as follows: Sung PS, Kim YH. Kinematic analysis of symmetric axial trunk rotation on dominant hip. J Rehabil Res Dev. 2011;48(8):102936. DOI: /JRRD Results Spinal range of motion (ROM) significantly differed for dominance, region, and hip motion. Rotational displacement of transverse and sagittal axes significantly differed and increased when participants tried to rotate, especially on dominant hip. Decreased axial trunk ROM on dominant hip was related to stiffened passive structures of hip joint. This article and any supplementary material should be cited as follows: Sung PS, Kim YH. Kinematic analysis of symmetric axial trunk rotation on dominant hip. J Rehabil Res Dev. 2011;48(8):102936. DOI: /JRRD Conclusions Hip joint and lumbar spine functions might be altered three-dimensionally based on side of dominance. Study is relevant to clinicians who evaluate hip and lumbar spine and assess rehabilitation progress, because lack of dominant hip-joint motion in transverse and sagittal axes might relate to flexibility of whole spinal region.