Jain A R Tony B, Alphin M S, Sri Krishnan G
Malla Reddy College of Engineering and Technology, Secunderabad, India.
SSN College of Engineering, Chennai, India.
J Orthop. 2020 Aug 27;22:390-396. doi: 10.1016/j.jor.2020.08.021. eCollection 2020 Nov-Dec.
The motorcycle is often used in recurring travel between locations, dense traffic, poor conditioned roads and thus the repetitive loading on the musculoskeletal system of the rider leads to risk factors associated with musculoskeletal disorders. This study was aimed to examine the biomechanical response of the L-4 lumbar spine while riding the motorcycle on the speed hump at 20 km/h.
Three-dimensional (3D) model of the L-4 lumbar spine was reconstructed based on the CT scan data obtained from the subjects. Material properties of the L-4 lumbar spine were assumed to be isotropic and homogenous. Mesh convergence and sensitivity analyses were performed and validated before simulation. Static and dynamic analyses were accomplished using quasi-static and steady-state dynamic analyses.
Static analysis results show that the highest stress concentrations were found around the pedicle and spinal canal. It is an expected commonplace for injuries because of loading. The dynamic simulation results showed the major resonance of the L-4 lumbar spine model is about 8-40 Hz. The stress, displacement, velocity, and acceleration value declines beyond 40 Hz as the frequency increases.
The simulation specifies the symmetric and unsymmetrical distributions of vibration magnitude regions of the lumbar spine. This study provides the modelling of the lumbar spine (L-4) and validated the effect of overloading failure as well as identified the biomechanical behaviour.
摩托车常用于往返于不同地点、交通密集、路况不佳的道路，因此骑手肌肉骨骼系统反复承受的负荷会导致与肌肉骨骼疾病相关的风险因素。本研究旨在研究以20公里/小时的速度在减速带上骑乘摩托车时L4腰椎的生物力学反应。
基于从受试者获得的CT扫描数据重建L4腰椎的三维（3D）模型。假设L4腰椎的材料属性为各向同性且均匀。在模拟之前进行并验证了网格收敛和敏感性分析。使用准静态和稳态动态分析完成了静态和动态分析。
静态分析结果表明，椎弓根和椎管周围出现最高应力集中。由于负荷导致受伤是意料之中的常见情况。动态模拟结果表明，L4腰椎模型的主要共振频率约为8 - 40赫兹。随着频率增加，应力、位移、速度和加速度值在超过40赫兹时下降。
模拟确定了腰椎振动幅度区域的对称和不对称分布。本研究提供了腰椎（L4）的建模，验证了过载失效的影响并确定了生物力学行为。
