Development of an in-vivo method to estimate the personalized 3D mass moment of inertia of the scoliotic trunk

开发体内方法来估计脊柱侧凸躯干的个性化 3D 质量惯性矩

• 批准号: 6160-2006
• 负责人: Allard, Paul
• 金额: $ 1.31万
• 依托单位: Université de Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2006
• 资助国家: 加拿大
• 起止时间: 2006-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=333949
• 关键词: Development; vivo; method; estimate; personalized

The general objectives of this proposal are to 1) develop a clinical method for estimating the in vivo personalized three-dimensional (3D) moment of inertia of the scoliotic trunk using an inverse dynamic approach and to 2) validate it. In adolescent idiopathic scoliosis (AIS), changes in the spine and rib cage develop progressively leading to a serious trunk deformity. Since spinal deformity often progresses, the moment of inertia is constantly changing at each clinical visit. This has a repercussion on the mobility of the trunk and its rigidity. Presently there is no clinical method for estimating the in vivo personalized moment of inertia of the ever changing scoliotic trunk though different methods have been proposed to estimate the body segment inertial properties. Anthropometric tables derived from cadavers do not truly represent the adolescent female population or scoliotic girls and can not be adapted for changing trunk shape. The first specific objective is to adapt our 3D inverse dynamic pendulum model to estimate the moment of inertia of the whole body when the subject willingly oscillates about the ankles. Normally, the muscle moment is the unknown value in an inverse dynamic calculation but can be eliminated using substitution leaving only the moment of inertia as the unknown. The parallel axis theorem can then be used to estimate the moment of inertia of the scoliotic trunk since that of the whole body and that of the un-deformed body segments are known. The second specific objective is to apply a similar approach using the angular momentum equation. The third specific objective is to compare our results with other accepted methods such video-based systems, our universe pendulum method or that of an oscillating table, etc. This work addresses for the first time the personalized in vivo mass moment of inertia of the scoliotic spine. Because scoliosis is a 3D deformation of the spine leading to changes in the trunk and that body morphology strongly affects standing stability and trunk mobility. It is reasonable to advance that modifications in the moment of inertia may be link to standing imbalance in scoliotic patient.

本提案的总体目标是：1）开发一种使用逆动力学方法估计脊柱侧凸躯干的体内个性化三维（3D）惯性矩的临床方法，并2）验证该方法。在青少年特发性脊柱侧凸（AIS）中，脊柱和肋骨的变化逐渐发展，导致严重的躯干畸形。由于脊柱畸形经常进展，惯性矩在每次临床访视时不断变化。这对躯干的灵活性和刚性产生了影响。目前还没有临床方法来估计不断变化的脊柱侧凸躯干的体内个性化惯性矩，尽管已经提出了不同的方法来估计身体节段惯性特性。来自尸体的人体测量表并不能真正代表青春期女性或脊柱侧凸女孩，也不能适应躯干形状的变化。第一个具体的目标是适应我们的3D逆动态摆模型估计的惯性矩的整个身体时，受试者愿意振荡的脚踝。通常，肌肉力矩是逆动力学计算中的未知值，但可以使用替代来消除，仅留下惯性力矩作为未知值。平行轴定理可以用来估计脊柱侧凸躯干的惯性矩，因为整个身体的惯性矩和未变形的身体节段的惯性矩是已知的。第二个具体目标是使用角动量方程应用类似的方法。第三个具体的目标是比较我们的结果与其他公认的方法，如基于视频的系统，我们的宇宙摆法或振荡表，等这项工作首次解决了个性化的脊柱侧凸脊柱的体内质量惯性矩。因为脊柱侧凸是脊柱的3D变形，导致躯干的变化，身体形态强烈影响站立稳定性和躯干活动性。有理由认为，转动惯量的改变可能与脊柱侧凸患者的站立不平衡有关。