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Figure 2. Work can be represented by area below force-path curve.(a) Hysteresis or energy dissipated by finger (Ehys) is difference between (b) work done on finger during closing (Eclose) and(c) elastic energy returned by finger during reopening (Eelastic). Adapted from Smit and Plettenburg [8]. Smit G, Plettenburg DH, van der Helm FC. Design and evaluation of two different finger concepts for body-powered prosthetic hand. J Rehabil Res Dev. 2013; 50(9):1253–66. http://dx.doi.org/10.1682/JRRD.2012.12.0223 ResearcherID/ORCID: Gerwin Smit, MSc, PhD: B-9994-2012; Dick H. Plettenburg, MSc, PhD: C-1078-2012; Frans C. T. van der Helm, MSc, PhD: C-3321-2011