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Journal of the Korean Academy of Rehabilitation Medicine 1996;20(3):16.
Instantaneous Axis of Rotation of the Lumbar Spines in the Lateral Bending
Byung Kyu Park, M.D., Hyun-Yoon Ko, M.D. , Ki Rim Kim, M.D.
Department of Rehabilitation Medicine, Pusan National University Hospital
요추 측면 굴곡 운동에 따른 순간회전축에 대한 연구
박병규, 고현윤, 김기림
부산대학교병원 재활의학과

The purpose of the study was to provide a guideline for the measurement of instantaneous axis of rotation (IAR) in the lateral bending and to compare the position and translation of IAR of normal persons and the patients with disc herniation. The X and Y axes were considered to be as the follows; X axis was a extension line passing bilateral the most upper margin of superior iliac crest, and Y axis was a perpendicular line to X axis passing L5 spinous process. 25 normal individuals and 24 patients with disc herniation were included in this study. There was no significant difference of the position and lateral translation of IAR of L2 vertebra body between in normal and patient groups. The results suggest that the support of the muscles and orientation of the facet joints of the lumbar spine would prevent a instability of the motion segments.

Key Words: Instantaneous axis of rotation, Lumbar spine, Coronal plane, Lateral bending


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