Lunate morphology

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


The lunate classification proposed by Viegas 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.

Anatomy: Upper limb
Share article

Article information

rID: 9811
Tag: variant
Synonyms or Alternate Spellings:
  • Lunate types
  • Lunate morphological types

Support Radiopaedia and see fewer ads

Cases and figures

  • Drag
    Case 1: type I lunate morphology
    Drag here to reorder.
  • Drag
    Case 1: type II lunate morphology
    Drag here to reorder.
  • Drag
    Case 2: type II lunate with impingement
    Drag here to reorder.
  • Updating… Please wait.

    Alert accept

    Error Unable to process the form. Check for errors and try again.

    Alert accept Thank you for updating your details.