Figure 1. Description of type of support-surface rotation and limb positions used. (a) Pitch plane surface rotations in toes-up and toes-down directions corresponding to rotations in sagittal plane (y-z).Mechanical axis of force platform denoted in (b). (b) Standing orientation on support surface. White support surface is level-mounted scale used to monitor weight distribution during testing protocol. Three coordinate directions (x-y-z) corresponding to (mediolateral-anteroposterior-superoinferior), with arrows corresponding to "positive" direction. (c)–(e) Standing position on platform and three limb-position scenarios. (c) Intact limb (gray) on force platform (also marked as gray), (d) both limbs on force platform, and (e) prosthetic limb (black) on force platform.
Rusaw D, Hagberg K, Nolan L, Ramstrand N. Bilateral electromyogram response latency following platform perturbation in unilateral transtibial prosthesis users: Influence of weight distribution and limb position. J Rehabil Res Dev. 2013;50(4):531–44.http://dx.doi.org/10.1682/JRRD.2012.01.0017