3D Analysis of the Proximal Interphalangeal Joint Kinematics during Flexion
Figure 2
(a) Starting and ending position of the PIP joint motion from extension (red) to flexion (green). The motion trajectory (blue curve) and average screw axis (blue line) are given. (b) Motion of the PIP joint from neutral position (red model) to full flexion (green model) described by a sequence of finite helical axes (from red to green). The axes are defined relative to the first FHA shown in red. The last FHA (full flexion) is denoted in green.
