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Based upon the findings of dissections of 15 forearms and clinical observations in
patients with disturbed architecture of the distal radioulnar joint, the pronator
quadratus was found to be composed of two heads. A superficial head originated from
the ulna and passed transversely to its insertion into the radius. It averaged 5.1
cm. in length, 4.5 cm. in width, 0.2 cm. in thickness, with a cross-sectional area
of 0.95 cm.2 and a contractile volume of 2.6 cm.3. The deep head ran obliquely from a more proximal origin on the ulna to a distal
insertion on the radius, with an average length of 4.0 cm., average width of 3.2 cm.,
and a thickness of 0.4 cm. Its average cross-sectional area was 1.64 cm.2 and its contractile volume 2.5 cm.3. A group of fibers occasionally was noted deep to both heads, running at right angles
to them and paralleling the direction of the fibers of the interosseous membrane.
The superficial head initiates pronation while the deep head coapts the joint surfaces
and stabilizes the joint.
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Article info
Publication history
Received in revised form:
July 9,
1976
Received:
February 3,
1976
Identification
Copyright
© 1976 American Society for Surgery of the Hand. Published by Elsevier Inc. All rights reserved.
