<unk>  is a<unk>  thumb in infants and young children.<unk> ing, clicking or snapping is observed by flexion or extension of the interphalangeal joint (IPJ). In the furthest stage, no extension is possible and there is a fixed flexion deformity of the thumb in the IPJ. Cause, natural history, prognosis and recommended treatment are controversial.
Congenital trigger thumb
Congenital clasped thumb
Adducted thumb syndrome
Mallet finger
Blue toe syndrome
Congenital contractural arachnodactyly
Hypothenar hammer syndrome
Radial dysplasia