Lunate morphology

Last revised by Dr Mohamed Saber on 02 Mar 2021

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.

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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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  • Case 3: type 2
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  • Case 4: type II with hamatolunate impingement syndrome
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