In brief: Mayfield et al. Classification: carpal dislocations and progressive perilunar instability.

According to Melsom and Leslie, the earliest description of perilunate dislocation was by Malgaigne in 1855, before the advent of radiography [7]. It later was described by Cousins, Destot, de Quervain, and others [7]. According to Melsom and Leslie [7] Tavernier reported the first series in 1906. Many years later, in 1968, the concept of the proximal row as an intercalated segment was described by Fisk [7]. In 1972, Linscheid et al. [4] modified the concept to develop models of dorsal and volar intercalated instability. The ligamentous pathoanatomy and classification of these injuries, however, had not been well described. In 1980, Mayfield et al. [5] performed a cadaveric study to better delineate the pathoanatomy and classify the degree of carpal instability after perilunate injury. Purpose