4.1 Article

The effect of individual isometric muscle loading on the alignment of the base of the thumb metacarpal: a cadaveric study

Journal

JOURNAL OF HAND SURGERY-EUROPEAN VOLUME
Volume 41, Issue 4, Pages 374-379

Publisher

SAGE PUBLICATIONS LTD
DOI: 10.1177/1753193415597114

Keywords

Thumb carpometacarpal joint; muscles; neuromuscular balance; osteoarthritis; joint stability

Funding

  1. Karolinska Institutet
  2. Hirsch fund

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Stability of the thumb carpometacarpal joint relies upon equilibrium between its ligaments, muscular support and joint congruity. We wanted to identify the muscles important in preventing or increasing dorsoradial subluxation of this joint. In ten cadaveric hands, a Fastrak((R)) motion tracking device was used to assess the effects of individual isometric muscle loading on the base of the thumb metacarpal relative to the radius and to the base of the middle finger metacarpal. We found that the first dorsal interosseous muscle caused the least dorsoradial translation and highest distal migration of the base of the first metacarpal, whereas abductor pollicis longus was the primary destabilizer, increasing dorsoradial misalignment. The findings show different impacts of these muscles on joint alignment and stability, which suggests that treatment should be targeted to enhance the action of the primary stabilizing muscle, the first dorsal interosseous muscle.

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