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Related Experiment Videos

The interosseous membrane affects load distribution in the forearm

D P Birkbeck1, J M Failla, S J Hoshaw

  • 1Department of Orthopaedic Surgery, Henry Ford Hospital, Detroit, MI, USA.

The Journal of Hand Surgery
|February 21, 1998
PubMed
Summary

The interosseous membrane transfers significant load from the wrist to the proximal forearm. Dividing this membrane eliminated load transfer between the radius and ulna bones.

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Area of Science:

  • Orthopedics
  • Biomechanics
  • Anatomy

Background:

  • The forearm's interosseous membrane is crucial for skeletal integrity and load distribution.
  • Understanding its precise role in load sharing is vital for diagnosing and treating forearm injuries.

Purpose of the Study:

  • To quantify the load-sharing function of the interosseous membrane.
  • To determine how the interosseous membrane facilitates force transfer between the radius and ulna.

Main Methods:

  • Simultaneous measurement of loads in the distal and proximal radius and ulna.
  • Measurements were taken with an intact interosseous membrane and after its transection under axial wrist loading.
  • Forearm positions, including supination, were analyzed.

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Main Results:

  • With an intact membrane, force transferred from the distal radius to the proximal ulna.
  • In supination, the distal radius bore 68% of the load, and the distal ulna bore 32%.
  • Transecting the membrane resulted in equal load distribution between proximal and distal segments of each bone, eliminating interosseous load transfer.

Conclusions:

  • The interosseous membrane is essential for transferring axial loads from the wrist to the proximal forearm.
  • Fibers from the proximal radius to the distal ulna facilitate this load transfer, exerting a proximal pull on the ulnar shaft.