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. Author manuscript; available in PMC: 2021 Jul 17.
Published in final edited form as: J Biomech. 2020 Jun 13;108:109890. doi: 10.1016/j.jbiomech.2020.109890

Fig. 1.

Fig. 1.

Experimental setup in gait laboratory and OpenSim model. (a) Participants walked on a dual belt instrumented treadmill while being imaged simultaneously using high-speed dual fluoroscopy (i.e. X-rays) and an optical motion capture system that measured the position of retroreflective markers adhered to the skin. (b) An OpenSim musculoskeletal model contained model markers (pink) that tracked experimental positions of skin markers (blue). Simulations used the marker positions, ground reaction forces (GRF), and model parameters as input to calculate joint moments, muscle activations, muscle forces and joint reaction forces.