Efficient Computation of Cartilage Contact Pressures within Dynamic Simulations of Movement.
Efficient Computation of Cartilage Contact Pressures within Dynamic Simulations of Movement.
复制标题
运动动态模拟中软骨接触压力的高效计算。
DOI：
10.1080/21681163.2016.1172346
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Thelen,DarrylG
中科院分区：
文献类型：
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作者：
Smith,ColinR;Choi,KwangWon;Negrut,Dan;Thelen,DarrylG
这项研究的目的是评估先进的碰撞检测算法在动态肌肉骨骼运动模拟中模拟软骨接触压力模式的使用。我们创建了一个膝关节模型，其中包括胫股关节和髌股关节的关节软骨接触。然后在动态步态模拟的背景下预测膝关节力学。在模拟的每个时间步，光线投射与层次定向边界框(OBB)结合使用，以快速识别关节软骨表面之间的重叠区域。然后使用弹性基础模型计算局部软骨接触压力。当使用具有10个三角形/mm2的高分辨率网格密度时，在GPU上并行实施的碰撞检测可提供高达10倍的速度提升。然而，压力量级在相当低的网格密度(2.6个三角形/mm2)下收敛，其中CPU和GPU实现的碰撞检测表现出同等的性能。模拟的胫股接触位置与之前的实验测量结果相似，而压力大小与有限元模型预测的结果相似。我们得出结论，光线投射和分层OBB用于碰撞检测是模拟人体运动中关节接触力学的一种可行的方法。
The objective of this study was to assess the use of an advanced collision detection algorithm to simulate cartilage contact pressure patterns within dynamic musculoskeletal simulations of movement. We created a knee model that included articular cartilage contact for the tibiofemoral and patellofemoral joints. Knee mechanics were then predicted within the context of a dynamic gait simulation. At each time step of a simulation, ray casting was used in conjunction with hierarchical oriented bounding boxes (OBB) to rapidly identify regions of overlap between articulating cartilage surfaces. Local cartilage contact pressure was then computed using an elastic foundation model. Collision detection implemented in parallel on a GPU provided up to a 10× speed increase when using high-resolution mesh densities that had >10 triangles/mm2. However, pressure magnitudes converged at considerably lower mesh densities (2.6 triangles/mm2) where CPU and GPU implementations of collision detection exhibited equivalent performance. Simulated tibiofemoral contact locations were comparable to prior experimental measurements, while pressure magnitudes were similar to those predicted by finite element models. We conclude the use of ray casting with hierarchical OBB for collision detection is a viable method for simulating joint contact mechanics in human movement.