Get 20M+ Full-Text Papers For Less Than $1.50/day. Subscribe now for You or Your Team.

Learn More →

Pathoanatomy and treatment modifications of metacarpophalangeal joint locking of the thumb

Pathoanatomy and treatment modifications of metacarpophalangeal joint locking of the thumb Ten patients with metacarpophalangeal joint locking of the thumb were studied. Three of them underwent surgical release. During surgery, it was found that the radial sesamoid was seated in a cartilage defect on the volar aspect of the metacarpal head. It appeared that the defect was created by the proximal edge of sesamoid. When the abductor pollicis brevis and flexor pollicis brevis muscles were partially detached from their insertion at the base of the proximal phalanx, the locking could be successfully released. We hypothesize the mechanism of the metacarpophalangeal joint locking of the thumb in our cases was a hyperextension injury that displaced the radial sesamoid distally and radially. In turn, the sesamoid’s pointed proximal edge wore a groove in the cartilage on the metacarpal head, and under abductor pollicis brevis and flexor pollicis brevis tension, the radial sesamoid was locked into the cartilage defect; thereby causing locking of the joint. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Hand Surgery (European Volume): Journal of the British Society for Surgery of the Hand & Official Journal of the Federation of European Societies for Surgery of the Hand SAGE

Loading next page...
 
/lp/sage/pathoanatomy-and-treatment-modifications-of-metacarpophalangeal-joint-Kkt3N733Fn

References (6)

Publisher
SAGE
Copyright
© The Author(s) 2013
ISSN
1753-1934
eISSN
2043-6289
DOI
10.1177/1753193413517621
pmid
24369362
Publisher site
See Article on Publisher Site

Abstract

Ten patients with metacarpophalangeal joint locking of the thumb were studied. Three of them underwent surgical release. During surgery, it was found that the radial sesamoid was seated in a cartilage defect on the volar aspect of the metacarpal head. It appeared that the defect was created by the proximal edge of sesamoid. When the abductor pollicis brevis and flexor pollicis brevis muscles were partially detached from their insertion at the base of the proximal phalanx, the locking could be successfully released. We hypothesize the mechanism of the metacarpophalangeal joint locking of the thumb in our cases was a hyperextension injury that displaced the radial sesamoid distally and radially. In turn, the sesamoid’s pointed proximal edge wore a groove in the cartilage on the metacarpal head, and under abductor pollicis brevis and flexor pollicis brevis tension, the radial sesamoid was locked into the cartilage defect; thereby causing locking of the joint.

Journal

Journal of Hand Surgery (European Volume): Journal of the British Society for Surgery of the Hand & Official Journal of the Federation of European Societies for Surgery of the HandSAGE

Published: Jan 1, 2015

There are no references for this article.