Diagnostic Criteria in the Diagnosis of Spinal Spondyloarthropathies in Patients With Chronic Low Back Pain (Study P05320)(COMPLETED)

Inclusion Criteria: * A subject must have back pain of unknown origin, of more than 3 months' duration, and with onset before age 45. * A subject must be willing to give written informed consent and be able to adhere to visit schedules. Exclusion Criteria: * Established diagnosis of spondyloarthropathies at the time of referral. * Any clinically significant condition or situation, other than the condition being studied, that, in the opinion of the investigator, would interfere with the study evaluations or optimal participation in the study.