[X-ray analysis of ossification of the cervical posterior longitudinal ligament].
D000328:Adult; D000368:Aged; D002574:Cervical Vertebrae / Q000000981:diagnostic imaging*; D002681:China; D005260:Female; D006801:Humans; D008022:Ligaments / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D009999:Ossification, Heterotopic / Q000000981:diagnostic imaging* / Q000453:epidemiology; D011859:Radiography