All subjects were referred for the
study by the same physician. As part
of the routine examination process,
subjects were screened through his
tory, physical examination, and standard anterior-posterior, lateral, and
oblique radiographs. Although disk
pathology cannot be definitively diagnosed through physical examination or radiographs, subjects with
disk herniation observed during MRI
were dropped from the study and
referred back to the physician for
additional follow-up.