[Studies on mobility and prognosis in spondylitis ankylosans]

278 patients with ankylosing spondylitis have been studied in order to find a basis for prognosis by setting a mobility function index of the vertebral column. This index does not depend on manifestation age or on the blood sedimentation rate. It increases with progression of x-ray findings. A coincidence of impaired mobility and overweight is relatively frequent and function index and electrophoresis are correlated. In contrary to this study a study of the course gives probably more prognostic indications.