Carpal coalition

Carpal coalition refers to fusion of two or more carpal bones, and although the most commonly involved bones are the lunate and triquetrum, most combinations of adjacent bones can be found to be coalesced. 

The estimated prevalence is ~0.1% in Caucasian Americans and ~1.5% in African Americans, and it tends to affect women more commonly 1-2.

Non-syndromatic congenital carpal coalition is transmitted via a mendelian inheritance pattern. Acquired intercarpal fusion can either be a consequence of an inflammatory arthropathy (e.g. rheumatoid arthritis, psoriatic arthritis, reactive arthritis) or injury, or due to intentional surgical arthrodesis.

As with tarsal coalition, congenital carpal coalition can either be osseous (synostosis), cartilaginous (synchondrosis), or fibrous (syndesmosis).

The two most common types are:

There are several associated conditions, especially with multiple coalitions:

Anatomy: Upper limb
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Article information

rID: 10789
Section: Anatomy
Tag: carpus
Synonyms or Alternate Spellings:
  • Coalition of carpal bones

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Cases and figures

  • Case 1: luno-triquetral coalition
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  • Case 2: luno-triquetral coalition
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  • Case 3: luno-triquetral coalition
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  • Case 4: luno-triquetral coalition
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  • Case 5: capitato-trapezoid
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  • There is coalitio...
    Case 6: extensive
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  • Case 7
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