1. Date of download: 11/8/2017
Copyright © ASME. All rights reserved.
From: Robust Identification of Three-Dimensional Thumb and Index Finger Kinematics With a Minimal Set of Markers
J Biomech Eng. 2013;135(9): doi: /
Figure Legend:
Solution modeling of the thumb and index finger digits. (a) Presumed solution model for each digit formed a 3-segment serial-link open chain from the hand segment treated as a grounded reference. Moving proximal-to-distal, the index finger joints were assumed to have 2, 1, and 1 degrees of freedom (DOFs). The corresponding thumb joints have 3, 2, and 1 DOFs. (b) Sagittal view for the index finger showing the joint positions (Oi, where i indicates proximal, middle, or distal) and aligned coordinate system axes (x∧, y∧,z∧) affixed to the corresponding segment. (Note: lateral axes (x∧) are not shown but assumed to point into the page). (c) Parameterized index finger model was used for optimization with unknown quantities parameterized to be a function of only three unknowns (axial rotation angles θL1, θL2, θP2). (Note: the figure of the hand is from pixelperfectdigital.com)