Bone position estimation from skin marker co-ordinates using global optimisation with joint constraints
Bone position estimation from skin marker co-ordinates using global optimisation with joint constraints
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DOI：
10.1016/s0021-9290(98)00158-4
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发表时间：
1999-02-01
影响因子：
2.4
通讯作者：
O'Connor, JJ
中科院分区：
文献类型：
--
作者：
Lu, TW;O'Connor, JJ
由于步态或运动分析的可靠性，特别是在评估额面和横面成分方面，步态或运动分析在诊断运动性病理患者以及随后的治疗计划和评估中的广泛应用一直受到限制。这是因为肌肉骨骼系统的空间重建以及通过基于皮肤标记的多链接模型对其运动学和动力学的计算受标记皮肤运动伪影的影响。传统的方法分别处理每个身体部分，没有施加关节约束，导致关节明显脱位，主要是因为皮肤运动伪影。提出了一种从标记点坐标确定多连杆肌肉骨骼模型位置和方向的优化方法。它基于测量的标记位置和模型确定的标记位置之间的加权距离平方和的最小化。该模型施加了运动类型约束。数值实验表明，该方法能够消除关节位错，并给出更准确的模型位置和方向估计。建议通过关节约束和全局误差补偿方案，在全局范围内减少测量误差对肌肉骨骼系统重建和随后的力学分析的影响。提出的方法使关节的轴向旋转和ab/内收误差最小化，并可将步态分析的适用性扩展到临床问题。(C)1999爱思唯尔科学有限公司。保留所有权利。
Widespread use of gait or motion analysis in the diagnosis of patients with locomotor pathology and the subsequent planning and assessment of treatment has been limited because of its reliability, particularly in evaluating frontal and transverse plane components. This is because spatial reconstruction of the musculoskeletal system and calculation of its kinematics and kinetics via a skin marker-based multi-link model are subject to marker skin movement artefacts. Traditional methods treat each body segment separately without imposing joint constraints, resulting in apparent dislocations at joints predominantly because of skin movement artefacts. An optimisation method for the determination of the positions and orientations of multi-link musculoskeletal models from marker co-ordinates is presented. It is based on the minimisation of the weighted sum of squared distances between measured and model-determined marker positions. The model imposes joint constraints. Numerical experiments were performed to show that the new method is capable of eliminating joint dislocations and giving more accurate model position and orientation estimations. It is suggested that, with joint constraints and a global error compensation scheme, the effects of measurement errors on the reconstruction of the musculoskeletal system and subsequent mechanical analyses can be reduced globally. The proposed method minimises errors in axial rotation and ab/adduction at the joints and may extend the applicability of gait analysis to clinical problems. (C) 1999 Elsevier Science Ltd. All rights reserved.