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Congenital radio-ulnar synostosis

Other Names for this Disease
  • Radial-ulnar synostosis
  • Radio-ulnar synostosis
  • Radioulnar synostosis
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Congenital radio-ulnar synostosis is a rare condition in which there is an abnormal connection (synostosis) of the radius and ulna (bones in the forearm) at birth.[1] The condition is present in both arms (bilateral) in approximately 60% of cases.[2] Signs and symptoms depend on the severity of the abnormality and whether it is bilateral; affected individuals often have limited rotational movement of the forearm.[1][2] Pain is usually not present until the teenage years.[2] It is due to abnormal fetal development of the forearm bones, but the underlying cause is not always known. It is sometimes a feature of certain chromosome abnormalities or genetic syndromes.[1][3][2] Some cases appear to be inherited in an autosomal dominant manner.[3] Treatment may be conservative or involve surgery depending on the severity of the abnormality and the range of movement.[1]
Last updated: 9/24/2012


  1. Anna Siemianowicz, Wojciech Wawrzynek, and Krzysztof Besler. Congenital radioulnar synostosis – case report. Pol J Radiol. Oct-Dec 2010; 75(4):51-54.
  2. Raymond Wurapa. Radial-Ulnar Synostosis . Medscape Reference. February 17, 2012; Accessed 9/24/2012.
  3. RADIOULNAR SYNOSTOSIS. OMIM. May 4, 2009; Accessed 9/24/2012.
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  • The Online Mendelian Inheritance in Man (OMIM) is an catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
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