Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Boston, MA, United States; Department of Orthopaedic Surgery, Harvard Medical School, Boston, MA, United States.
Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Boston, MA, United States.
Appl Ergon. 2023 Jan;106:103869. doi: 10.1016/j.apergo.2022.103869. Epub 2022 Aug 30.
Static biomechanical simulations are sometimes used to estimate in vivo kinetic demands because they can be solved efficiently, but this ignores any potential inertial effects. To date, comparisons between static and dynamic analyses of spinal demands have been limited to lumbar joint differences in young males performing sagittal lifts. Here we compare static and dynamic vertebral compressive and shear force estimates during axial, lateral, and sagittal lifting tasks across all thoracic and lumbar vertebrae in older men and women. Participant-specific thoracolumbar full-body musculoskeletal models estimated vertebral forces from recorded kinematics both with and without consideration of dynamic effects, at an identified frame of peak vertebral loading. Static analyses under-predicted dynamic compressive and resultant shear forces, by an average of about 16% for all three lifts across the thoracic and lumbar spine but were highly correlated with dynamic forces (average r > .95). The study outcomes have the potential to enable standard clinical and occupational estimates using static analyses.
静态生物力学模拟有时用于估计体内动力学需求，因为它们可以有效地解决，但这忽略了任何潜在的惯性效应。迄今为止，对脊柱需求的静态和动态分析之间的比较仅限于年轻男性在进行矢状提升时腰椎关节的差异。在这里，我们比较了在轴向、侧向和矢状提升任务中，所有胸椎和腰椎在老年男性和女性中的静态和动态椎体压缩和剪切力估计值。参与者特异性胸腰椎全身肌肉骨骼模型从记录的运动学中估计了椎体力，同时考虑和不考虑动态效应，在椎体加载的确定帧中。静态分析对所有三种提升在胸椎和腰椎上的动态压缩和结果剪切力的预测都偏低，平均约为 16%，但与动态力高度相关（平均 r>.95）。研究结果有可能使标准的临床和职业评估能够使用静态分析。
