Date of download: 10/14/2017 Copyright © ASME. All rights reserved. From: The Envelope of Physiological Motion of the First Carpometacarpal Joint J Biomech Eng. 2015;137(10):101002-101002-8. doi:10.1115/1.4031117 Figure Legend: Surface renderings (a) and density-based renderings (b) from CT images acquired at the targeted thumb positions of neutral (N), flexion (F), adduction (Ad), extension (E), and abduction (Ab). The horizontal and vertical polycarbonate plates used to standardize and stabilize the hand during imaging are also shown. The larger cylinder supported the extended fingers. The thumb spica splint used to standardize the neutral thumb position is not visible due to its low density.