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首页> 美国卫生研究院文献>other >Direct measurement of intervertebral disc maximum shear strain in six degrees of freedom: Motions that place disc tissue at risk of injury
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Direct measurement of intervertebral disc maximum shear strain in six degrees of freedom: Motions that place disc tissue at risk of injury

机译：直接测量六个自由度的椎间盘最大剪切应变：使椎间盘组织受伤的运动

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Human intervertebral disc specimens were tested to determine the regions of largest maximum shear strain experienced by disc tissues in each of three principal displacements and three rotations, and to identify the physiological rotations and displacements that may place the disc at greatest risk for large tissue strains and injury. Tearing of disc annulus may be initiated by large interlamellar shear strains. Nine human lumbar discs were tagged with radiographic markers on the endplates, disc periphery and with a grid of wires in the mid-transverse plane and subjected to each of the six principal displacements and rotations. Stereo-radiographs were taken in each position and digitized for reconstruction of the 3-D position of each marker. Maximum tissue shear strains were calculated from relative marker displacements and normalized by the input displacement or rotation. Lateral shear, compression, and lateral bending were the motions that produced the mean (95% confidence interval) largest regional maximum shear strains (MSS) of 9.6 (0.7) %/mm, 9.0 (0.5) %/mm, and 5.8 (1.6) %/° respectively, and which occurred in the posterior, posterolateral and lateral peripheral regions of the disc. After taking into account the reported maximum physiological range of motion for each degree of freedom, motions producing the highest physiological MSS were lateral bending (57.8 (16.2)%) and flexion (38.3 (3.3)%), followed by lateral shear (14.4 (1.1)%) and compression (12.6 (0.7)%).
机译：对人的椎间盘标本进行了测试，以确定在三个主要位移和三个旋转中每个椎间盘组织经历的最大最大剪切应变区域，并确定可能使椎间盘承受较大组织应变和最大风险的生理旋转和位移。受伤。椎间盘瓣环撕裂可能是由较大的层间剪切应变引起的。九个人的腰椎间盘在端板，椎间盘的周围以及中横断面的金属丝网上用射线照相标记标记，并经受六个主要位移和旋转中的每一个。在每个位置都拍摄了立体射线照相，并将其数字化以重建每个标记的3-D位置。从相对标记位移计算最大组织剪切应变，并通过输入位移或旋转将其标准化。横向剪切，压缩和横向弯曲是产生最大区域最大剪切应变（MSS）的平均值（95％置信区间）的运动，分别为9.6（0.7）％/ mm，9.0（0.5）％/ mm和5.8（1.6） ）％/°，分别发生在椎间盘的后，后外侧和外侧外围区域。考虑到所报告的每个自由度的最大生理运动范围后，产生最高生理MSS的运动为横向弯曲（57.8（16.2）％）和屈曲（38.3（3.3）％），然后是横向剪切力（14.4（ 1.1）％）和压缩率（12.6（0.7）％）。

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