Lunate morphology

Dr Andrew Dixon et al.

Several classification systems exist for the lunate morphology 1, 2.

Classification

The lunate classification proposed by Veigas et al is arguably the most relevant 3

  • type I lunates: single distal articular facet for the capitate
  • type II lunates: additional distal articular facet medially for the hamate

There is roughly an even prevalence of the two morphology types.

Type I lunates are associated with higher prevalence of dorsal intercalated segment instability (DISI) deformity in the setting of scaphoid fracture non-union (~75% vs. 20%).

Type II lunates are associated with hamatolunate impingement syndrome leading to a higher prevalence of hamatolunate degenerative arthritis 4.

 


Upper limb anatomy
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Article Information

rID: 9811
Tag: variant
Synonyms or Alternate Spellings:

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    Type I lunate mor...
    Case 1: type I lunate morphology
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    Case 1: type II lunate morphology
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    Case 2: type II lunate with impingement
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