Research Article
Passive Mechanical Properties of Human Medial Gastrocnemius and Soleus Musculotendinous Unit
Figure 1
(a) Illustration of the experimental set-up and example ultrasound images during the measurement. The foot is firmly strapped to the footplate of the dynamometer during passive rotation. The ultrasound transducer (US) tracks displacement of the muscle-tendon junction (MTJ) while the motion capture system tracks the location of the reflective markers placed on the US transducer, calcaneus, and the scaffold of the dynamometer. (b) Twenty-seven reflective markers are placed bilaterally on the subject’s body landmarks based on a conventional full-body marker set during a static standing reference trial. Marker data is then used to alter the anthropometry of the generic musculoskeletal model to match the subject as closely as possible in OpenSim by the Scale Tool [25]. Musculotendon paths (in red) of medial gastrocnemius and soleus (right limb) are illustrated in a set of straight lines connecting each pair of adjacent points.
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