Stabilizing components of the proximal radial head

Analysis to determine the anatomical structures that supply the transverse stability to the proximal radius

The interosseous membrane (IM) is a structure complex that is comprised of a distal, central and proximal band. Together these structures contribute to the overall forearm stability. To date, the literature has focused on the axial stability rather than the transverse stability the IM supplies to the forearm. The authors set out to determine what structures were integral for providing stability when a transverse load is applied directly to the radius, such as during biceps activation. Following investigation it was shown that with pure transverse displacement the annular ligament, central and proximal band of the IM provided equal stabilizing forces whereas during rotation the central band provided the majority of the stabilizing force.

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