Vitamin D levels in patients with ankylosing spondylitis: is it related to disease activity?

ABSTRACT

Objective: Ankylosing Spondylitis [AS] is an inflammatory rheumatic disease that mainly affects the axial spine. Osteopenia and osteoporosis are the main complications of AS. Vitamin D has functions on the immune system. In this study, we aimed to compare vitamin D levels and Bone Mineral Density [BMD] values between AS patients and controls