Vol 65, No 3 (2006)
Original article
Published online: 2006-06-08
The morphology and function of the quadrate ligament
Folia Morphol 2006;65(3):225-227.
Abstract
There is a paucity of information in the literature regarding the quadrate ligament
and the information that does exist is extremely conflicting. We dissected 30 cadavers
(60 sides) to determine the morphology and function of this enigmatic
ligament. A quadrate ligament (thickening of the elbow joint capsule) was found
in all specimens. In all specimens this band was distinct from the circumferential
fibres of the annular ligament. The length, width, and thickness of the quadrate
ligament were found to be 11 mm, 8 mm, and 1 mm respectively. This ligament
not only aided in securing the neck of the radius to the ulna but also resisted
excessive supination and, to a lesser degree, pronation of the forearm. Following
transection of the quadrate ligament, the head of the radius was secured to the
ulna considerably less firmly and supination and pronation increased by 10 to 20
degrees and 5 to 8 degrees respectively. The quadrate ligament contributes to
proximal radioulnar stability, limits the "spin" of this joint, and should be considered
in manipulation, surgery, or imaging of the proximal forearm.
Keywords: anatomyelbowforearmstabilityradiusulnar
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