Mayfield classification of carpal instability (perilunate instability)

Last revised by Henry Knipe on 29 Aug 2024

Mayfield classification of carpal instability, also known as perilunate instability classification (carpal dislocations), describes carpal ligament injuries as related to perilunate injuries.

The Mayfield classification is commonly used (c. 2012) for staging perilunate injuries 4. The Mayo classification is also used to more broadly classify carpal instability 5.

Mayfield et al. divided perilunate instability into four stages 1-2:

This classification was described by Mayfield et al. in 1980 1.

Cases and figures

  • Figure 1: Progressive perilunate instability
  • Case 1 : perilunate dislocation
  • Case 1 : perilunate dislocation
  • Case 2 : scapholunate dissociation
  • Case 2 : scapholunate dissociation
  • Case 3 : lunate dislocation
  • Case 4 : scapholunate dislocation
  • Case 5 : stage IV
  • Case 6: Midcarpal (lunotriquetral) dislocation
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