γγThe diagnosis of ankylosing spondylitis is mainly: medical history, physical examination, and imaging.γγ1, low back pain as inflammatory low back pain: is the back and hip pain and discomfort occurring before the age of 40 years, or peripheral arthropathy except for other causes; insidious onset; with nocturnal pain, morning stiffness; symptoms do not improve after rest, improve after activity; persist for more than 5 weeks; 2, physician’s examination: sacroiliac joint examination (+), attachment point inflammation manifestation; 3, serum is negative science RF (-) ANA (-) B-27; 4, physician’s radiological criteria: sacroiliac arthritis (bilateral grade 2 / unilateral grade 3 or more); Suggest pain department or rheumatology consultation.