[The rheumatoid patient as back pain patient. Diagnosis and differential diagnosis of seronegative spondylarthropathies].

Based on an epidemiology study the frequency of back pain in the population was established by forty percent. Otherwise only thirty percent of patients with backache are diagnosed definitely by practitioners. In view of these circumstances the 1991 published diagnosis criteria for spondylarthropathies are a helpful work in definition of spondylarthropathy patients. Furthermore a new described autoantibody specifically for spondylarthropathies seems to be helpful for this diagnosis of these systemic rheumatic diseases.