Familial subluxation of the metacarpophalangeal and proximal interphalangeal joints of the little finger in two consecutive siblings: the "serpentine little finger".

Two consecutive siblings, both males, presented with congenital curly little finger ('serpentine finger') caused by subluxations at the metacarpo-phalangeal and the proximal interphalangeal joints. Literature on this phenomenon is scant, and to the best of the authors' knowledge it is probably a new entity. A theory of the possible aetiology is presented.