Print Email Facebook Twitter Parameter Scaling Protocol for Upper-limb Musculoskeletal Models Title Parameter Scaling Protocol for Upper-limb Musculoskeletal Models Author Peñas de Santos, Pablo (TU Delft Mechanical, Maritime and Materials Engineering) Contributor van der Helm, Frans (mentor) Mirakhorlo, Mojtaba (graduation committee) Degree granting institution Delft University of Technology Date 2019-10-31 Abstract Generic musculoskeletal models are not reliable predicting inter-individual variations in muscle forces. Scaling the model parameters is necessary to represent the muscle characteristics of the subjects and thus to pinpoint the differences in force capacity. Optimal Fiber (OFL) and Tendon Slack Length (TSL) have been identified as the two most influential parameters in muscle force generation. The goal of the current study is adjusting a lower-limb scaling algorithm for OFL and TSL to the Delft Shoulder and Elbow Model (DSEM). Furthermore, we evaluate the effect on the preservation of model consistency and muscle force production. Firstly, we scaled the DSEM geometrically. That drove twenty-two muscles to work out of the physiological range in the F-L curve up to 41% of the shoulder ROM. Moreover, the consistency of the model dropped by 78%. We tested three approaches to scale OFL and TSL. The constrained method delivered the best results reducing these percentages to 8% and 2.9%, respectively. It also increased the muscle force production of the DSEM 1.2%BW compared to the geometrically scaled version. The adaptation of the constrained scaling algorithm to the DSEM provides consistency values in the same range observed in lower-limb models. Therefore, we state that it is necessary to scale OFL and TSL whenever the dimensions of the DSEM are modified to obtain reliable muscle force estimations. We recommend further validation of the procedure developed in this article, for example, against data from instrumented endoprosthesis. Subject Musculoskeletal ModelDelft Shoulder and Elbow Model,Optimal Fiber LengthTendon Slack LengthScalingUpper-limbMuscle-tendon parameters To reference this document use: http://resolver.tudelft.nl/uuid:c967e276-862e-4ea8-8078-a29b03293b4b Embargo date 2019-10-31 Part of collection Student theses Document type master thesis Rights © 2019 Pablo Peñas de Santos Files PDF MScThesis_PabloPenas.pdf 587.2 KB Close viewer /islandora/object/uuid:c967e276-862e-4ea8-8078-a29b03293b4b/datastream/OBJ/view