Kim Young Eun, Choi Hae Won
Department of Mechanical Engineering, Dankook University, Yongin-si, Korea.
Proc Inst Mech Eng H. 2013 Feb;227(2):138-47. doi: 10.1177/0954411912463322.
Paraspinal muscle forces were derived computationally based on the hypothesis that the intervertebral disc has a transducer function and the muscle is activated according to a sensor-driving control mechanism. A three-dimensional finite element model of the musculoskeletal system, which consisted of a detailed whole lumbar spine, pelvis, simplified trunk model, and muscles, was developed and combined with an optimization technique to calculate muscle forces in isometric forward flexed and erect standing postures. Minimization of deviations in the nucleus pressure and averaged tensile stress in the annulus fibers at five discs was used for muscle force calculations. The results indicated that all the muscles were properly activated to maintain posture and stabilize the lumbar spine. The nucleus pressure difference was decreased during the iterative calculations and its resulting value at the L4/L5 level was consistent with in vivo measurements. Muscle activation produced vertebra motion, which resulted in a relatively uniform stress distribution in the intervertebral discs. This can minimize the risk of injury at a specific level and increase the ability of the spine to sustain a load.
椎旁肌力量是基于椎间盘具有换能器功能且肌肉根据传感器驱动控制机制被激活这一假设通过计算得出的。开发了一个肌肉骨骼系统的三维有限元模型，该模型由详细的整个腰椎、骨盆、简化的躯干模型和肌肉组成，并与一种优化技术相结合，以计算等长前屈和直立站立姿势下的肌肉力量。通过使五个椎间盘的髓核压力和纤维环平均拉伸应力的偏差最小化来进行肌肉力量计算。结果表明，所有肌肉都被适当地激活以维持姿势并稳定腰椎。在迭代计算过程中髓核压力差减小，其在L4/L5水平的结果值与体内测量结果一致。肌肉激活产生椎骨运动，这导致椎间盘内应力分布相对均匀。这可以将特定水平的受伤风险降至最低，并提高脊柱承受负荷的能力。
