Mayfield classification of carpal instability (perilunate instability)

Last revised by Andrew Murphy on 1 Aug 2020

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

Instability has been divided into four stages 1-2:

History and etymology

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

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Cases and figures

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