[Kirner's deformity.  Apropos of 3 new cases.  Review of the literature]. 
Three cases of Kirner's deformity in siblings are reported.  Kirner's deformity consists in a palmar bending of the terminal phalanx of the 5th finger.  The deformity is usually bilateral; the condition is congenital but the deformity is recognized in later childhood and has to be classified as osteochondrodysplasia.