Lunate morphology

Dr Henry Knipe and Dr Andrew Dixon et al.

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

Classification

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

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

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

Related pathology

Type I lunates are associated with a 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.

Anatomy: Upper limb
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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

  • 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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