title: Atlantoaxial instability in Down syndrome.
mesh_terms: D001265:Athletic Injuries / Q000209:etiology; D001268:Atlanto-Axial Joint / Q000000981:diagnostic imaging; D002648:Child; D004314:Down Syndrome / Q000150:complications*; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000150:complications*; D008297:Male; D011859:Radiography; D012307:Risk Factors