Validation and calibration processes of a musculoskeletal model of the hand and forearm
Résumé
Musculoskeletal disorders linked to professional manual tasks can now be considered asa public health issue because of their associated costs. In order to prevent these work-related disorders, knowledge of internal biomechanical parameters of the hand andforearm such as muscle forces and joint loads is essential. To this aim, a biomechanicalmodel of the hand and forearm representing the whole complexity of thismusculoskeletal system (21 segments, 21 joints and 46 musculotendon units) has beendeveloped. In order to confirm results obtained by the musculoskeletal model of thehand and forearm, a validation process is performed based on EMG signals and externalforces (from a manual dynamometer). Two validation parameters have been defined tocompare real measures and estimations from the model: muscle activation and theresulting external force. These parameters are compared for different industrial manualtasks (grasping, pinching, holding...). Although amplitude differences are observed, firstresults show qualitative correspondences between experimental and simulation data. Inorder to refine the musculoskeletal model of the hand and forearm, a calibration processbased on the coupled measure of EMG and manual dynamometer is proposed. Bothprocesses are discussed and results provided by the musculoskeletal model are detailed.This work is a preliminary step to improve the robustness of musculoskeletal modellingfor biomechanical and ergonomic analyses.
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