Level of subject-specific detail in musculoskeletal models affects hip moment arm length calculation during gait in pediatric subjects with increased femoral anteversion

摘要: Biomechanical parameters of gait such as muscle's moment arm length (MAL) and muscle-tendon are known to be sensitive anatomical variability. Nevertheless, most studies rely on rescaled generic models (RGMo) constructed from averaged data cadaveric measurements in a healthy adult population. As an alternative, deformable (DGMo) have been proposed. These integrate higher level subject-specific detail by applying characteristic deformations the musculoskeletal geometry. In contrast, based magnetic resonance (MR) images (MRMo) reflect involved subject's characteristics every model. This study investigated effect varying levels these three model types calculated hip MAL during pediatric population seven cerebral palsy subjects presenting aberrant femoral Our results show large percentage differences between RGMo MRMo. Furthermore, use DGMo did not uniformly reduce inter-model MAL. The magnitude stresses need take effects into account when selecting one wants musculoskeletal. variability muscles makes it very difficult priori estimate their importance for biomechanical analysis certain muscle given subject.