carpal boss


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carpal boss

A bony growth on the dorsal surface of the third metacarpocarpal joint.
See also: boss
References in periodicals archive ?
Though an acute os styloideum appeared on the routine wrist imaging series seen in Figure A, radiographic imaging of the carpal boss is difficult due to superimposition of structures on a standard wrist series.
When present, this ossicle is suggested to be completely isolated in 2% of cases, but more commonly fused to the proximal third metacarpal (94%), the capitate (3.5%) or trapezoid (0.5%).20 The relationship to the carpal boss was not drawn until 1955 by Bassoe and Bassoe who suggested that the os styloideum represented the symptomatic carpal boss.
(2,6) The age range of carpal boss does not coincide with degenerative changes revealing bossing in individuals as young as eleven years old, and a mean age of 32.