Lunate morphology

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:
  • Lunate types
  • Lunate morphological types

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Cases and figures

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