Mayfield Stages of Progressive Perilunate Instability.

Stage I results in scapholunate instability. Stages II to IV result in progressively worse perilunate instability.

(From DuckworthAD, StrelzowJ. Carpal fractures and dislocations. In: TornettaP III, RicciWM, OstrumRF, et al., eds. Rockwood and Green’s Fractures in Adults. Vol 1. 9th ed. Philadelphia: Wolters Kluwer; 2020:1591–1664.)