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The lunate (os lunatum or semilunar) is one of the carpal bones and is a component of the proximal carpal row.
The lunate is crescent-shaped with a proximal convex articular facet and a distal concave articular facet. On the medial surface is a square-shaped facet and on the lateral surface is a semilunar facet. It is broader anteriorly than it is posteriorly.
articulates with the triangular fibrocartilage complex
palmar: radiolunotriquetral, radioscapholunate, ulnolunate ligaments
branches from the dorsal radiocarpal arch and dorsal intercarpal arch supply the lunate via the dorsal and palmar surfaces (80%) or palmar surface only (20%) 2
variation in articular facets (see: lunate morphology)
associated accessory ossicles
bipartite lunatum 6
frontal projection (neutral wrist position)
more than one-half should contact distal radial articular surface 3
should have a 'square shape' and the intercarpal joints should be uniformly 1-2 mm wide
forms part of the carpal arcs
has a cup-shaped appearance, with the base of the capitate sitting in the cup
Ossification typically begins at age four and is complete by age six or seven 2.
History and etymology
From the Latin "luna" meaning moon, referring to the crescent-moon shape of the lunate. It was first named the "lunatum" in 1653 by Lyser, and has also been termed the "lunare" or "semilunare".
scapholunate advanced collapse (SLAC wrist)
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