Institut de recherche Robert-Sauvé en santé et en sécurité du travail (IRSST), Montreal, Quebec, Canada; Center for Interdisciplinary Research in Rehabilitation of Greater Montreal (CRIR), Montreal, Quebec, Canada.
Institut de recherche Robert-Sauvé en santé et en sécurité du travail (IRSST), Montreal, Quebec, Canada; Center for Interdisciplinary Research in Rehabilitation of Greater Montreal (CRIR), Montreal, Quebec, Canada; Division of Applied Mechanics, Department of Mechanical Engineering, Polytechnique Montréal, Canada.
J Biomech. 2024 Jan;162:111867. doi: 10.1016/j.jbiomech.2023.111867. Epub 2023 Nov 15.
Recent developments in musculoskeletal (MS) modeling have been geared towards model customization. Personalization of the spine profile could affect estimates of spinal loading and stability, particularly in the upright standing posture where large inter-subject variations in the lumbar lordosis have been reported. This study investigates the biomechanical consequences of changes in the spinal profile. In 31 participants (healthy and with back pain), (1) the spine external profile was measured, (2) submaximal contractions were recorded in a dynamometer to calibrate the EMG-driven MS model and finally (3) static lifting in the upright standing challenging spine stability while altering load position and magnitude were considered. EMG signals of 12 trunk muscles and angular kinematics of 17 segments were recorded. For each participant, the MS model was constructed using either a generic or a personalized spinal profile and 17 biomechanical outcomes were computed, including individual muscle forces, ratios of muscle group forces, spinal loading and stability parameters. According to the ANOVA results and corresponding effect sizes, personalizing the spine profile induced medium and large effects on about half MS model outcomes related to the trunk muscle forces and negligible to small effects on spinal loading and stability as more aggregate outcomes. These effects are explained by personalized spine profiles that were a little more in extension as well as more pronounced spine curvatures (lordosis and kyphosis). These findings suggest that spine profile personalization should be considered in MS spine modeling as it may impact muscle force prediction and spinal loading.
最近在肌肉骨骼（MS）建模方面的发展侧重于模型定制。脊柱轮廓的个性化可能会影响脊柱负荷和稳定性的估计，特别是在直立站立姿势下，已经报道了腰椎前凸的大个体间变化。本研究调查了脊柱轮廓变化的生物力学后果。在 31 名参与者（健康和背痛）中，（1）测量了脊柱外部轮廓，（2）在测力计中记录了次最大收缩以校准肌电图驱动的 MS 模型，最后（3）考虑了在直立站立时静态举重，改变了负荷位置和幅度，这对脊柱稳定性构成了挑战。记录了 12 个躯干肌肉的肌电图信号和 17 个节段的角度运动学。对于每个参与者，使用通用或个性化的脊柱轮廓构建了 MS 模型，并计算了 17 个生物力学结果，包括个体肌肉力量、肌肉群力量比、脊柱负荷和稳定性参数。根据 ANOVA 结果和相应的效应量，个性化脊柱轮廓对大约一半与躯干肌肉力量相关的 MS 模型结果产生了中等和较大的影响，对脊柱负荷和稳定性的影响可忽略不计到较小。这些效应是由个性化脊柱轮廓引起的，这些轮廓稍微更伸展，脊柱曲率（前凸和后凸）更明显。这些发现表明，在 MS 脊柱建模中应考虑脊柱轮廓个性化，因为它可能会影响肌肉力量预测和脊柱负荷。
