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J Hand Surg Eur Vol. 2016 May;41(4):374-9. doi: 10.1177/1753193415597114. Epub 2015 Aug 6.

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

Author information

1
Karolinska Institutet Södersjukhuset, Institutionen för klinisk forskning och utbildning, Stockholm, Sweden Department of Hand and Plastic Surgery, Stavanger University Hospital, Stavanger, Norway nathalie.mobargha@ki.se.
2
Clinica Activamutua, Tarragona, Spain.
3
Department of Anatomy, Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain Institut Kaplan, Barcelona, Spain.
4
Clinic for Plastic Surgery and Hand Surgery, Technical University of Munich, Munich, Germany.
5
Karolinska Institutet Södersjukhuset, Institutionen för klinisk forskning och utbildning, Stockholm, Sweden Hand & Foot Surgery Center, Stockholm, Sweden.

Abstract

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® 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.

KEYWORDS:

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

PMID:
26253421
DOI:
10.1177/1753193415597114
[Indexed for MEDLINE]

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