Nicolescu Julia, Gaudette Logan, Vogel Olivia, Davis Irene S, Tenforde Adam S, Troy Karen L
Dept. of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA.
Dept. of Physical Medicine and Rehabilitation, Harvard Medical School, Spaulding Rehabilitation Hospital, Charlestown, MA.
bioRxiv. 2024 May 15:2024.05.13.593935. doi: 10.1101/2024.05.13.593935.
Multisegmented foot models (MSFMs) capture kinematic and kinetic data of specific regions of the foot instead of representing the foot as a single, rigid segment. Models differ by the number of segments and segment definitions, so there is no consensus for best practice. It is unknown whether MSFMs yield the same joint kinematic and kinetic data and what level of detail is necessary to accurately measure such values. We compared the angle, moment, and power measurements at the tibiotalar, midtarsal, and metatarsophalangeal joints of four MSFMs using motion capture data of young adult runners during stance phase of barefoot walking and jogging. Of these models, three were validated: Oxford Foot Model, Milwaukee Foot Model, and Ghent Foot Model. One model was developed based upon literature review of existing models: the "Vogel" model. We performed statistical parametric mapping comparing joint measurements from each model to the corresponding results from the Oxford Model, the most heavily studied MSFM. We found that the Oxford Foot Model, Milwaukee Foot Model, Vogel Foot Model, and Ghent Foot Model do not provide the same results. The changes in model segment definitions impact the degrees of freedom in ways that alter the measured kinematic function of the foot, which in turn impacts the kinetic results. We also found that dynamic function of the midfoot/arch may be better captured by MSFMs with a separate midfoot segment. The results of this study capture the variability in performance of MSFMs and indicate a need to standardize the design of MSFMs.
多节段足部模型（MSFMs）可获取足部特定区域的运动学和动力学数据，而不是将足部表示为一个单一的刚性节段。不同模型的节段数量和节段定义各不相同，因此对于最佳实践尚无共识。目前尚不清楚多节段足部模型是否能产生相同的关节运动学和动力学数据，以及准确测量这些值需要何种详细程度。我们使用年轻成年跑步者在赤足行走和慢跑站立阶段的运动捕捉数据，比较了四种多节段足部模型在胫距关节、中跗关节和跖趾关节处的角度、力矩和功率测量值。在这些模型中，有三种经过了验证：牛津足部模型、密尔沃基足部模型和根特足部模型。一种模型是基于对现有模型的文献综述开发的：“沃格尔”模型。我们进行了统计参数映射，将每个模型的关节测量值与研究最多的多节段足部模型——牛津模型的相应结果进行比较。我们发现牛津足部模型、密尔沃基足部模型、沃格尔足部模型和根特足部模型并未提供相同的结果。模型节段定义的变化以改变足部测量运动学功能的方式影响自由度，进而影响动力学结果。我们还发现，具有单独中足节段的多节段足部模型可能能更好地捕捉中足/足弓的动态功能。本研究结果揭示了多节段足部模型性能的变异性，并表明需要对多节段足部模型的设计进行标准化。
