Carpal boss

The carpal boss is an unmovable hypertrophied bony protuberance at the base of the second or third metacarpals on the dorsal surface, near the capitate and trapezium. 


The condition may represent either or a combination of:

Pain may be the result of a ganglion, inflamed bursa or extensor tendon slipping over the bony prominence.

Radiographic features

The radiographic appearance of a carpal boss is characteristic, however optimal visualisation of the boss may be difficult to obtain due to superimposed bony structures. 

CT may show degenerative disease at a pseudo-arthrosis, and MRI will show oedema related to abnormal motion.

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Article information

rID: 27636
Tag: cases, cases
Synonyms or Alternate Spellings:
  • Carpometacarpal bossing
  • Carpe bossu
  • Carpal bossing

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Cases and figures

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    Case 1: ultrasound
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