Anatomical and principal axes are not aligned in the torso: Considerations for users of geometric modelling methods

JOURNAL OF BIOMECHANICS

卷:114

Article

Choppin, Simon¹  Clarkson, Sean¹  Bullas, Alice¹  Thelwell, Michael¹  Heller, Ben¹  Wheat, Jon¹ 

[1] Sheffield Hallam Univ, Sport & Phys Act Res Ctr, Sheffield, S Yorkshire, England

关键词: 3D Imaging;    Body Segment Inertial Parameters;    Inverse Dynamics;    Geometric Modelling;    Principal Axes;   

DOI  :  10.1016/j.jbiomech.2020.110151

来源: Elsevier

【 摘 要 】

The accuracy and accessibility of methods to calculate body segment inertial parameters are a key concern for many researchers. It has recently been demonstrated that the magnitude and orientation of principal moments of inertia are crucial for accurate dynamic models. This is important to consider given that the orientation of principal axes is fixed for the majority of geometric and regression body models. This paper quantifies the effect of subject specific geometry on the magnitude and orientation of second moments of volume in the trunk segment. The torsos of 40 male participants were scanned using a 3D imaging system and the magnitude and orientation of principal moments of volume were calculated from the resulting geometry. Principal axes are not aligned with the segment co-ordinate system in the torso segment, with mean Euler angles of 11.7, 1.9 and 10.3 in the ZXY convention. Researchers using anatomical modelling techniques should try and account for subject specific geometry and the mis-alignment of principal axes. This will help to reduce errors in simulation by mitigating the effect of errors in magnitude of principal moments. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

Free