metacarpal index

met·a·car·pal in·dex

the average ratio of length to breadth of metacarpals II to V; this ratio is increased in the Marfan syndrome.
References in periodicals archive ?
Radiographically, the metacarpal index (The ratio of length to width of the second through fifth metacarpal bones] is increased.
Radiographic evaluation of arachnodactyly can be done by measuring the metacarpal index (MI).
Alveolar bone loss in periodontal disease and the metacarpal index. J Periodontol 1973;44: 763-9.