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A three-dimensional finite element model of maximal grip loading in the human wrist

Author(s): M. K. Gislason, D. H. Nash, A. Nicol, A. Kanellopoulos, M. Bransby-Zachary, T. Hems, B. Condon, B. Stansfield

Abstract:
The aim of this work was to create an anatomically accurate three-dimensional finite element model of the wrist, applying subject-specific loading and quantifying the internal load transfer through the joint during maximal grip. For three subjects, representing the anatomical variation at the wrist, loading on each digit was measured during a maximal grip strength test with simultaneous motion capture. The internal metacarpophalangeal joint load was calculated using a biomechanical model. High-resolution magnetic resonance scans were acquired to quantify bone geometry. Finite element analysis was performed, with ligaments and tendons added, to calculate the internal load distribution. It was found that for the maximal grip the thumb carried the highest load, an average of 72.2 +/- 20.1 N in the neutral position. Results from the finite element model suggested that the highest regions of stress were located at the radial aspect of the carpus. Most of the load was transmitted through the radius, 87.5 per cent, as opposed to 12.5 per cent through the ulna with the wrist in a neutral position. A fully three-dimensional finite element analysis of the wrist using subject-specific anatomy and loading conditions was performed. The study emphasizes the importance of modelling a large ensemble of subjects in order to capture the spectrum of the load transfer through the wrist due to anatomical variation.

Full version: Available here

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ISBN: 0954-4119
Publication Year: 2009
Periodical: Proceedings of the Institution of Mechanical Engineers Part H-Journal of Engineering in Medicine
Periodical Number: H7
Volume: 223
Pages: 849-861
Author Address: Gislason, MK Univ Strathclyde, Bioengn Unit, Wolfson Bldg,106 Rottenrow, Glasgow G4 0NW, Lanark, Scotland Univ Strathclyde, Bioengn Unit, Glasgow G4 0NW, Lanark, Scotland So Gen Hosp, Glasgow G51 4TF, Lanark, Scotland Royal Victoria Infirm, Glasgow, Lanark, Scotland Glasgow Caledonian Univ, Glasgow G4 0BA, Lanark, Scotland