Predicted effects of metacarpal shortening on interosseous muscle function

The Journal of Hand Surgery
Matthew J MeunierR L Lieber

Abstract

Metacarpal fractures are common in hand surgery. Metacarpal shortening ranging from 2 mm to as much as 10 mm has been deemed acceptable in the literature. We examined the effect of metacarpal shortening on interosseous muscle architecture and predicted force production capacity based on the standard muscle length-tension curve (commonly known as the Blix curve). The dorsal interosseous muscles between the middle and ring finger metacarpals from 9 adult human cadaver hands were exposed and studied. The ring finger metacarpal was translated proximally in 2-mm increments in relation to a stationary middle finger metacarpal. Digital images were obtained and analyzed to define the length and orientation of individual muscle fibers with each incremental change in position. Interosseous muscle fiber length increased and pennation angle decreased uniformly with increasing proximal translation of the ring finger metacarpal. At 10 mm of shortening the fiber length had increased to 20.8 +/- 1.8 mm, or to approximately 125% of optimum fiber length, and the pennation angle had decreased to 6.7 degrees +/- 2.2 degrees or by approximately 50%. The interosseous muscles have been shown to have a high fiber-to-muscle length ratio. This ratio ind...Continue Reading

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Citations

May 27, 2009·Current Reviews in Musculoskeletal Medicine·Matthew E Oetgen, Seth D Dodds
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