Back pain can be a symptom of any number of problems, most commonly me
chanical, or structural, in nature. Among the nonmechanical causes is
ankylosing spondylitis, an inflammatory disease that involves the spin
e and sometimes other joints and extra-articular organs. Dr Escalante
explains how to differentiate this disease from other causes of back p
ain, describes simple clinical diagnostic tests, and outlines current
treatment. The condition's link with HLA-B27 is also discussed.