[Kirner's deformity. Early age spontaneous curving of the terminal phalanx of the 5th finger].

Kirner's malformation of the fifth finger represents an unusual bony anomaly that has an uncertain etiopathogenesis: there is possibly a connection with a district alteration of the vascularisation of the fifth finger distal phalanx. It must be discriminated from the typical clenodactyly an anomaly which concerns prevalently finger terminal phalanx without bony alterations and which presents a distribution in the family. The case we related concerning a little girl, aged 11, had considerable advantage after a corrective osteotomy.