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. Author manuscript; available in PMC: 2012 Feb 24.
Published in final edited form as: J Biomech. 2010 Nov 18;44(4):669–675. doi: 10.1016/j.jbiomech.2010.11.004

Figure 2.

Figure 2

Schematic of the process followed to compute muscle volumes for each of the personalized patient-specific strength models. Strength ratios were calculated for each patient, relative to the non-impaired (NI) strength model, and used to scale the volume of 1) the three heads of the triceps (TRI1, TRI2 and TRI3), 2) the two wrist extensors (ECRB and ECRL), and 3) the two heads of the biceps (BIC1 and BIC2) and brachialis (BRA) muscles. Strength was computed as the sum of posture-specific muscle moments (M) generated by each muscle group, assuming full agonist muscle activation, and zero antagonist co-activation. Note the elbow flexors were scaled based on a combination of measured joint strength and imaged volume of the BR muscle.