What is the most common extra aicular manifestation of ankylosiing spondylitis?

Extra aicular manifestations of ankylosing spondylitis Up to 40% of patients also have peripheral musculoskeletal lesions (asymmetrical, affecting entheses of large joints, such as the hips, knees, ankles and shoulders).Fatigue is a major complaint and is common to all SpAs, but its cause is unknown. Acute anterior uveitis is the most common extra-aicular feature, which occasionally precedes joint disease Ref Davidson 23e p1030