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TECHNICAL PAPERS: Joint/Whole Body

A 3D Biomechanical Model of the Hand for Power Grip

[+] Author and Article Information
Joaquı́n L. Sancho-Bru, A. Pérez-González, M. Vergara

Departament de Tecnologia, Universitat Jaume I. Campus de Riu Sec. 12071 Castelló, Spain

D. J. Giurintano

Paul Brand Biomechanics Laboratory, National Hansen’s Disease Programs, 1770 Physicians Park Drive, Baton Rouge, LA

J Biomech Eng 125(1), 78-83 (Feb 14, 2003) (6 pages) doi:10.1115/1.1532791 History: Received October 01, 2001; Revised August 01, 2002; Online February 14, 2003
Copyright © 2003 by ASME
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References

Figures

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Parameters used to scale the model: HL (hand length) and HB (hand breadth)
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Sketch of the extensor mechanisms of the fingers (dorsal view): (a) index finger; (b) medial finger; (c) ring finger; (d) little finger
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Modeling MCP collateral ligament using a straight line joining the insertion points on both bones
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Experimental averaged total grip force measured by Lee and Rim 20 and estimated values by the model for the female and male subjects, and its mean
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Force distribution among fingers: (a) measured by Lee and Rim 20; (b) estimated by the model for the female subject
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Different views of the postures considered in the simulation of the cylinder grip for the male subject over cylinders of 38.1 mm (upper figures) and 25.4 mm (lower figures)
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Estimated muscle activities for the female subject grasping a cylinder of 38.1 mm while exerting the maximal grasping force, and 50% of the estimated maximal force
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Index and medial muscle force reductions when the handle diameter is varied from largest (the diameter providing the smallest maximal force) to smallest, expressed as percentage reduction from the muscle forces predicted for the largest diameter. The simulations have been performed over the female subject. The smallest maximal force previously estimated for the five diameters has been considered as the gripping force for each of the postures.

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