The carpal boss (carpe bossu) is a bony protuberance at the carpometacarpal joints of the index and middle fingers. It is most commonly caused by an osteophyte at the base of the metacarpal bones originating from the carpometacarpal joint, or less commonly, by a supernumerary bone (e.g, an os styloideum), as seen in the image above. A carpal boss may be accompanied by a small ganglion cyst.
Monday, June 6, 2011
Carpal Boss
The carpal boss (carpe bossu) is a bony protuberance at the carpometacarpal joints of the index and middle fingers. It is most commonly caused by an osteophyte at the base of the metacarpal bones originating from the carpometacarpal joint, or less commonly, by a supernumerary bone (e.g, an os styloideum), as seen in the image above. A carpal boss may be accompanied by a small ganglion cyst.
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