The gross and histologic anatomy of the scapholunate interosseous ligament*,**

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The scapholunate interosseous ligament, which connects the carpal scaphoid and lunate bones, was evaluated by gross dissection and serial histologic sections in transverse, sagittal, and coronal planes in 21 fresh and 16 fixed adult cadaver wrists. The scapholunate interosseous ligament is consistently divisible into three anatomic regions: dorsal, proximal, and palmar. The dorsal region is thick and composed of short, transversely oriented collagen fibers. The proximal region is principally composed of fibrocartilage, with a few superficial, longitudinally oriented collagen fibers. The proximal region may extend distally a few millimeters into the scapholunate joint space, thus resembling a knee meniscus. The radioscapholunate ligament separates the proximal and palmar regions of the scapholunate interosseous ligament, often extending distally to cover the dorsal surface of the palmar region of the scapholunate interosseous ligament. The palmar region is thin and composed of obliquely oriented collagen fascicles, just dorsal to and separate from the long radiolunate ligament.

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*

This work was presented in part at the 23rd annual meeting of the American Association for Hand Surgery, 1992, Vancouver, British Columbia, Canada, and at the 38th meeting of the Orthopaedic Research Society, 1992, San Francisco, CA, and the NATO Advanced Research Workshop on Advances in the Biomechanics of the Hand and Wrist, 1992, Brussels, Belgium.

**

No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article. This work was supported in part by grants from the American Association for Hand Surgery and the Orthopaedic Research and Education Foundation.

1

From the Department of Orthopedic Surgery and Anatomy, Mayo Clinic/Mayo Foundation, Rochester, MN.

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