title: The enthesopathy of ankylosing spondylitis.
abstract: The enthesopathic lesion of ankylosing spondylitis consists of a nonspecific, nongranulomatous inflammatory lesion which leads to destruction of the attachment of ligament to bone. Resulting erosion leads to reactive bone formation which may form a new enthesis and around the outer fibres of the annulus may lead to syndesmophyte formation. What determines the distribution of the enthesopathy and ankylosis is not known.
mesh_terms: D002574:Cervical Vertebrae; D006801:Humans; D007085:Ilium; D007719:Knee Joint; D008023:Ligaments, Articular / Q000473:pathology*; D013167:Spondylitis, Ankylosing / Q000473:pathology*