Nine healthy subjects sustained maximum grip of an instrumented handle while voluntarily moving the wrist joint within their available range of motion of the wrist in a continuous and random manner. Individual finger forces and wrist angular positions in flexion/extension and radial/ulnar deviation were recorded simultaneously. Wrist position had a significant effect on individual finger force and total force production. Peak finger forces were produced at 20° of wrist extension and 5° of ulnar deviation. At this position, a mean total grip force of 114.9 (±12.8) N was produced with force-sharing percentages of 32.2% (±3.8%), 32.6% (±4.3%), 23.5% (±4.5%), and 11.7% (±4.9%) among the index, middle, ring, and small finger, respectively. As the wrist was moved farther away from this position, the forces produced by individual fingers decreased incrementally; however, the decreases in individual finger forces were not proportional, leading to a dependence of finger force-sharing patterns on wrist position. Copyright © 2002 by the American Society for Surgery of the Hand.
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