A 14 years old boy with Kirner's deformity is demonstrated. He has the
typical radial and volar deviation of the terminal phalanges of the 5
th finger. Nature and inheritance of the disease are discussed. We ass
ume inborn ossification distarbances. Most authors recommend to avoid
any therapy. But we feel that nowadays it is possible to use plaster s
plints in young children or to do a corrective operation in older ones
with good success.