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An autosomal dominant disease characterized by proximal fusion of the radius and ulna resulting in extremely limited pronation and supination of the forearm. There are two disease forms. Radioulnar synostosis type 1 is characterized by a proximal fusion between the radius and ulna, and the radial head is absent. Radioulnar synostosis type 2 is characterized by a fusion just distal to the proximal radial epiphysis, and congenital dislocation of the radial head. In radioulnar synostosis type 2 there is also a restriction of extension at the elbow.




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