School of Mechanical Engineering, Shandong University of Technology, Zibo, PR China.
School of Mechanical Engineering, Shandong University of Technology, Zibo, PR China.
World Neurosurg. 2024 May;185:e431-e441. doi: 10.1016/j.wneu.2024.02.045. Epub 2024 Feb 13.
To investigate the influence of sacroiliac interosseous ligament tension and laxity on the biomechanics of the lumbar spine.
A static analysis of a three-dimensional finite element model of the Lumbar-Pelvic is conducted to verify the model's effectiveness. Adjusting the sacroiliac ligament's elasticity modulus under a 10Nm lumbar flexion/extension moment, it simulates ligament tension/laxity to calculate vertebrae displacements, intervertebral disc stress and deformation, nucleus pulposus pressure, facet joint force, and ligament stress.
With the elastic modulus of the sacroiliac ligament changing by +50%, -50%, and -90%, the angular displacement of vertebra 3 in forward flexion changes by +1.64%, -4.84%, and -42.3%, and the line displacements change by +5.7%, -16.4%, and -144.9%, respectively; and the angular displacements in backward extension change by +0.2%, -0.6%, -5.9% and the line displacements change by +5.5%, -14.3%, and -125.8%. However, the angular displacement and center distance between adjacent vertebrae do not change, leading to no change in the maximum stress of the intervertebral disc and the maximum pressure in the nucleus pulposus. Flexion and extension directly affect the deformation and stress magnitude and distribution in the lumbar spine.
While sacroiliac interosseous ligament laxity and tension have little effect on disc deformation and stress, and nucleus pulposus pressure, they reduce the stability of the lumbar-sacral vertebrae. In a forward flexion state, the lumbar ligaments bear a large load and are prone to laxity, thereby increasing the risk of lumbar injury.
研究骶髂骨间韧带张弛度对腰椎生物力学的影响。
对腰椎骨盆的三维有限元模型进行静态分析，以验证模型的有效性。在 10Nm 腰椎屈伸力矩下调整骶髂韧带的弹性模量，模拟韧带紧张/松弛，计算椎体位移、椎间盘应力和变形、髓核压力、小关节力和韧带应力。
骶髂骨间韧带弹性模量分别增加 50%、减少 50%和减少 90%时，第 3 节椎体前屈角位移分别增加 1.64%、减少 4.84%和减少 42.3%，线位移分别增加 5.7%、减少 16.4%和减少 144.9%；后伸角位移分别增加 0.2%、减少 0.6%和减少 5.9%，线位移分别增加 5.5%、减少 14.3%和减少 125.8%。但是，相邻椎体的角位移和中心距离不变，导致椎间盘最大应力和髓核最大压力不变。屈伸直接影响腰椎的变形和应力大小及分布。
骶髂骨间韧带松弛和紧张对椎间盘变形和应力以及髓核压力影响不大，但会降低腰椎-骶骨椎体的稳定性。在前屈状态下，腰椎韧带承受较大的负荷，容易松弛，增加了腰椎损伤的风险。
