title: Traumatic atlanto-occipital dislocations: value of the Powers ratio in diagnosis.
mesh_terms: D000063:Accidents, Traffic; D001269:Atlanto-Occipital Joint / Q000000981:diagnostic imaging / Q000293:injuries* / Q000473:pathology; D002648:Child; D005260:Female; D006801:Humans; D004204:Joint Dislocations / Q000000981:diagnostic imaging* / Q000473:pathology; D008722:Methods; D011859:Radiography