title: Atlantoaxial instability in Down's syndrome.
mesh_terms: D000293:Adolescent; D000328:Adult; D001268:Atlanto-Axial Joint; D002648:Child; D002675:Child, Preschool; D004314:Down Syndrome / Q000150:complications*; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000150:complications*; D008297:Male; D008875:Middle Aged