![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhc_zla2VwzVJp0PC-oKaTuDXOjeBjFkbxGQBeB23_J3hKGnan0dq6MXjKRoxdUCecVYh87sZDxdp66q8FbdiD68HJUlVTtT4-5IOqtNAbLvtAyFQY0ZaLcz3_xwCNiSeyv67niWT80vgH5/s400/lunatesidebyside.jpg)
*Most severe of carpal instabilities
*Most commonly associated with a trans-scaphoid fracture
*Involves all the intercarpal joints and disruption of most of the major carpal ligaments
*Produces volar dislocation and forward rotation of lunate
Concave distal surface of lunate comes to face anteriorly
*Capitate drops into space vacated by lunate
*Capitate and all other carpal bones lie posterior to lunate on lateral radiograph
*Triangular appearance of lunate on frontal projection