Department of Kinesiology, University of Waterloo, Waterloo, Canada.
Department of Kinesiology, University of Waterloo, Waterloo, Canada.
Hum Mov Sci. 2021 Aug;78:102824. doi: 10.1016/j.humov.2021.102824. Epub 2021 May 29.
The relationship between externally measured and internal spine axial twist motion (rotation about a vertical axis) is not well understood. Ultrasound is a validated technique for measurement of vertebral axial twist motion and has the potential for measuring segmental vertebral axial twist in vivo. The objective of this study was to evaluate lumbar segmental axial twist in relation to external thoracopelvic twist from optical motion capture using an ultrasound imaging technique. Sixteen participants were tested in a custom-built axial twist jig, which isolated motion to the lumbar spine. Participants were moved from neutral to 75% of maximum axial twist range of motion in an upright kneeling posture. Thoracopelvic motion was recorded with a motion capture system and L1 to S1 vertebral axial twist was recorded using ultrasound. From motion capture, maximum thoracopelvic axial twist motion was 41.1 degrees. From ultrasound, the majority of axial twist motion occurred at the L2-L3 (46.8% of lumbar axial twist motion) and L5-S1 (33.5%) intervertebral joints. Linear regression linking axial twist at each vertebral level to thoracopelvic axial twist ranged from 0.43 to 0.79. These findings demonstrate a mathematical relationship between internal and external axial twist motion and the distribution of motion across the lumbar spine suggests that classic use of L4-L5 to represent lumbar spine motion may not be appropriate for axial twist modelling approaches.
外部测量和内部脊柱轴向扭转运动（绕垂直轴的旋转）之间的关系尚未得到很好的理解。超声是测量椎体轴向扭转运动的一种经过验证的技术，具有测量体内节段性椎体轴向扭转的潜力。本研究的目的是使用超声成像技术评估腰椎节段轴向扭转与胸腰旋转之间的关系。16 名参与者在定制的轴向扭转夹具中进行测试，该夹具将运动限制在腰椎上。参与者从中立位到直立跪姿的最大轴向扭转运动范围的 75%进行移动。使用运动捕捉系统记录胸腰运动，使用超声记录 L1 至 S1 椎体轴向扭转。从运动捕捉中，最大胸腰轴向扭转运动为 41.1 度。从超声检查中，轴向扭转运动主要发生在 L2-L3（腰椎轴向扭转运动的 46.8%）和 L5-S1（33.5%）椎间关节。将每个椎体水平的轴向扭转与胸腰轴向扭转相关联的线性回归范围从 0.43 到 0.79。这些发现表明内部和外部轴向扭转运动之间存在数学关系，并且运动在整个腰椎的分布表明，经典地使用 L4-L5 来代表腰椎运动可能不适合轴向扭转建模方法。
