Pseudosubluxation of the axis in young adults.
Pseudosubluxation or anterior slippage of the axis on C-3 is a well recognized physiologic phenomenon in children. Because of a downward shifting of the apex of flexion of the cervical spine that occurs at about age 10, this physiologic offset of C-2 has been thought unlikely to occur in older individuals. However, a review of a series of flexion and extension cervical spine films showed six such cases in the 14- to 21-year age range.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001368:Axis, Cervical Vertebra / Q000000981:diagnostic imaging* / Q000293:injuries; D002574:Cervical Vertebrae / Q000000981:diagnostic imaging; D006801:Humans; D004204:Joint Dislocations / Q000000981:diagnostic imaging*; D008875:Middle Aged; D011859:Radiography