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Kinematic analysis of symmetric axial trunk rotation on dominant hip

Kinematic analysis of symmetric axial trunk rotation on dominant hip. Paul S. Sung, PhD, DHSc, PT; Yoon Hyuk Kim, PhD. Study Aim

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Kinematic analysis of symmetric axial trunk rotation on dominant hip

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  1. Kinematic analysis of symmetric axial trunk rotation on dominant hip Paul S. Sung, PhD, DHSc, PT; Yoon Hyuk Kim, PhD

  2. 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.

  3. Axial Rotation Test • Participant stands with legs extended with stick bar and performs axial rotation activities 5 times. • During testing, participant maintains standing stability while reflective markers collect kinematic data from x (frontal), y (sagittal), and z (transverse) spine axes.

  4. 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.

  5. 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.

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