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首页> 外文期刊>Journal of Biomechanics >Do kinematic models reduce the effects of soft tissue artefacts in skin marker-based motion analysis? An in vivo study of knee kinematics.
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Do kinematic models reduce the effects of soft tissue artefacts in skin marker-based motion analysis? An in vivo study of knee kinematics.

机译：运动学模型是否会减少基于皮肤标记物的运动分析中的软组织伪影的影响？膝关节运动学的体内研究。

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摘要

We investigated the effects of including kinematic constraints in the analysis of knee kinematics from skin markers and compared the result to simultaneously recorded trajectories of bone pin markers during gait of six healthy subjects. The constraint equations that were considered for the knee were spherical and revolute joints, which have been frequently used in musculoskeletal modelling. In the models, the joint centres and joint axes of rotations were optimised from the skin marker trajectories over the trial. It was found that the introduction of kinematic constraints did not reduce the error associated with soft tissue artefacts. The inclusion of a revolute joint constraint showed a statistically significant increase in the mean flexion/extension joint angle error and no statistically significant change for the two other mean joint angle errors. The inclusion of a spherical joint showed a statistically significant increase in the mean flexion/extension and abduction/adduction errors. In addition, when a spherical joint was included, a statistically significant increase in the sum of squared differences between measured marker trajectories and the trajectories of the pin markers in the models was seen. From this, it was concluded that both more advanced knee models as well as models of soft tissue artefacts should be developed before accurate knee kinematics can be calculated from skin markers.
机译：我们研究了从皮肤标志物分析膝盖运动学中包括运动学约束的影响，并将结果与​​同时记录的六名健康受试者步态中骨钉标志物的运动轨迹进行了比较。膝关节所考虑的约束方程是球形和旋转关节，在肌肉骨骼模型中经常使用。在模型中，在试验过程中，根据皮肤标记轨迹优化了关节中心和关节旋转轴。发现运动学约束的引入并没有减少与软组织假象相关的误差。包含旋转关节约束条件显示平均屈曲/伸展关节角度误差在统计学上有显着增加，而其他两个平均关节角度误差在统计学上没有显着变化。球形关节的内陷显示出平均屈曲/伸展度和外展/内收误差的统计学显着增加。另外，当包括球形接头时，模型中测得的标记轨迹和销钉标记轨迹之间的平方差之和的统计上显着增加。由此得出的结论是，应先开发更高级的膝关节模型和软组织伪影模型，然后才能从皮肤标记物计算出准确的膝关节运动学。

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