Arcuate ligament of the wrist: normal MR appearance and its relationship to palmar midcarpal instability: a cadaveric study |
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Authors: | Weiling Chang Anthony J Peduto Rodrigo O C Aguiar Debra J Trudell Donald L Resnick |
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Institution: | (1) Department of Radiology, Veterans Administration Medical Center, San Diego, CA, USA;(2) Department of Radiology, Sharp-Grossmont Hospital, 5555 Grossmont Center Drive, La Mesa, CA 91942, USA;(3) Department of Radiology, Westmead Hospital and Western Clinical School of Sydney University, Sydney, Australia;(4) Universidade Federal do Rio de Janeiro, Cidade Universitaria, Rio de Janerio, Brazil |
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Abstract: | Objective To describe the magnetic resonance (MR) imaging and gross anatomic appearance of the scaphocapitate (SC) ligament and triquetrohamocapitate
(THC) ligament, which are the radial and ulnar limbs of the composite arcuate ligament, a critical volar midcarpal stabilizing
ligament.
Design T1 spin-echo and 3D gradient-echo MR imaging in the standard, coronal oblique, and axial oblique planes were performed both
before and following midcarpal arthrography in seven cadaveric wrists. The seven specimens were then sectioned in selected
planes to optimally visualize the SC and THC ligaments. These specimens were analyzed and correlated with their corresponding
MR images.
Results The SC and THC ligaments can be visualized in MR images as structures of low signal intensity that form an inverted “V” joining
the proximal and distal carpal rows. The entire ligamentous complex is best visualized with coronal and axial oblique MR imaging
but can also be seen in standard imaging planes.
Conclusion SC and THC ligaments together form the arcuate ligament of the wrist. Their function is crucial to the normal functioning
of the wrist. Palmar midcarpal instability (PMCI) is a resulting condition when abnormalities of these ligaments occur. Dedicated
MR imaging in the coronal and axial imaging planes can be performed in patients suspected of having PCMI. |
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Keywords: | Wrist Cadaver Arcuate ligament MR imaging |
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