Greaves Carolyn Y, Gadala Mohamed S, Oxland Thomas R
Division of Orthopaedic Engineering Research, Departments of Mechanical Engineering and Orthopaedics, University of British Columbia, #566-828 West 10th Ave, Vancouver, BC, Canada.
Ann Biomed Eng. 2008 Mar;36(3):396-405. doi: 10.1007/s10439-008-9440-0. Epub 2008 Jan 29.
The spinal cord may be injured through various spinal column injury patterns (e.g., burst fracture, fracture dislocation); however, the relationship between column injury pattern and cord damage is not well understood. A three-dimensional finite element model of a human cervical spine and spinal cord segment was developed, verified using published experimental data, and used to investigate differences in cord strain distributions during various column injury patterns. For a transverse contusion injury, as would occur in a burst fracture, a 33% canal occlusion resulted in two peaks of strain between the indentor and opposing vertebral body and intermediate peak strain values. For a distraction injury, relevant to column distortion injuries, a 2.6 mm axial displacement to the cord resulted in more uniform strains throughout the cord and low peak strain values. For a dislocation injury, as would occur in a fracture dislocation, an anterior displacement of C5 corresponding to 30% of the sagittal dimension of the vertebral body resulted in high peak strain values adjacent to the shearing vertebrae and increased strains in the lateral columns compared to contusion. This model includes more anatomical details compared to previous studies and provides a baseline for mechanical comparisons in spinal cord injury.
脊髓可能会因各种脊柱损伤模式(如爆裂骨折、骨折脱位)而受损;然而,脊柱损伤模式与脊髓损伤之间的关系尚未得到充分理解。建立了一个人类颈椎和脊髓节段的三维有限元模型,使用已发表的实验数据进行验证,并用于研究各种脊柱损伤模式下脊髓应变分布的差异。对于横向挫伤损伤,如爆裂骨折中会发生的情况,33%的椎管闭塞导致在压头与相对椎体之间出现两个应变峰值以及中间峰值应变值。对于与脊柱扭曲损伤相关的牵张损伤,脊髓轴向位移2.6毫米会导致整个脊髓的应变更加均匀且峰值应变值较低。对于骨折脱位中会出现的脱位损伤,C5向前位移相当于椎体矢状径的30%,导致与剪切椎体相邻处出现高的峰值应变值,并且与挫伤相比,侧柱中的应变增加。与先前的研究相比,该模型包含更多的解剖细节,并为脊髓损伤的力学比较提供了一个基线。
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