Direct comparison of calculated hip joint contact forces with those measured using instrumented implants. An evaluation of a three-dimensional mathematical model of the lower limb
Direct comparison of calculated hip joint contact forces with those measured using instrumented implants. An evaluation of a three-dimensional mathematical model of the lower limb
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DOI：
10.1016/s0021-9290(03)00072-1
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发表时间：
2003-07-01
影响因子：
2.4
通讯作者：
Bergmann, G
中科院分区：
文献类型：
--
作者：
Stansfield, BW;Nicol, AC;Bergmann, G
髋关节接触力的特征对于定义髋关节假体的设计要求是至关重要的。使用器械髋关节假体进行了活体髋关节接触力的测量。然而，为了能够确定关节接触力的范围及其相对于解剖结构的方向，足以形成商定的数据库，有必要采用不同的方法而不使用植入的换能器。使用下肢的数学模型来检查软组织和关节中的力，为了解内部负荷条件提供了有价值的见解。几位作者提出了肌肉骨骼的数学模型。然而，在验证这些模型方面只有有限的尝试。可以使用带器械假体的在体测力结果来验证使用数学模型计算的结果。在这项研究中，两名受试者进行了器械髋关节假体的研究。髋关节处的力是使用腿部的三维模型计算的。对慢速、常速和快速(0.97~2.01m/S)步行、两条腿到一条腿再向后、坐到站的重量转移进行了研究。在“黄金标准”测量的髋关节接触力和计算力之间进行了直接比较。计算的力和实测力在模式和大小上都基本一致。然而，也有不同之处。讨论了这些结果差异的原因，并提出了可能的模型发展。(C)2003爱思唯尔科学有限公司。保留所有权利。
Characterisation of hip joint contact forces is essential for the definition of hip joint prosthesis design requirements. In vivo hip joint contact force measurements have been made using instrumented hip joint prostheses. However, to allow determination of the range of values of joint contact force and their directions relative to anatomical structures in a range of subject groups sufficient to form an agreed data base it is necessary to adopt a different approach without the use of an implanted transducer. The use of mathematical models of the lower limb to examine the forces in soft tissues and at the joints has provided valuable insight into internal loading conditions. Several authors have proposed mathematical musculo-skeletal models. However, there have been only limited attempts at validation of these models. It is possible to use the results of in vivo force measurements from instrumented prostheses to validate the results calculated using the mathematical models. In this study two subjects with instrumented hip joint prostheses were studied. Forces at the hip joints were calculated using a three-dimensional model of the leg. Walking at slow, normal and fast speeds (0.97-2.01 m/s), weight transfer from two to one leg and back again, and sit to stand were studied. Direct comparisons were made between the 'gold standard' measured hip joint contact forces and the calculated forces. There was general agreement between the calculated and measured forces in both pattern and magnitude. There were, however, discrepancies. Reasons for these differences in results are discussed and possible model developments suggested. (C) 2003 Elsevier Science Ltd. All rights reserved.