Fig. 2

Coactivation Index (CI) during maximal voluntary isometric contraction of the wrist flexors of the non-affected hand (a) and affected hand (b) before and after 6 months of prosthesis use. CI during wrist extension of the non-affected hand (c) and affected hand (d) are also shown in this figure. Although no significant interactions were found in the current investigation, the affected hand exhibited a 70% reduction in the coactivation index after using the wrist-driven 3D printed hand prosthesis compared to a 30% reduction for the non-affected hand