title: [Ankylosing spondylitis and osteoporosis].
abstract: OBJECTIVE
  Ankylosing Spondylitis (AS) is an inflammatory rheumatism characterized by its disease course with flares leading to progressive ankylosis of the spine related to paravertebral ligamentous and discal structures ossification. AS patients suffer significantly more vertebral fractures than control groups. These fractures could affect cervical spine. They are due to either ankylosis-related flawed spine compliance or AS-induced osteoporosis.
  
  
  BACKGROUND
  The physiopathology of this osteoporosis is multi-factorial, but essentially linked to AS-related inflammatory phenomenons. It is marked by reduced bone density (at lumbar spine and femoral neck), increased bone turnover (with increased urinary C-telopeptide cross-linked collagen type 1), but without any significant change in phosphocalcic blood parameters. Histological features are depressed bone formation, with either maintained or increased resorption.
  
  
  CONCLUSIONS
  The screening of this osteoporosis is based upon investigating people at risk (progressive inflammatory AS) using dual-energy x-ray absorptiometry and biochemical markers of bone turnover. Treatment is based upon a modulation of both inflammatory phenomenons and bone remodelling using bisphosphonates and anti-TNF alpha.
authors.affiliation: Service de Rhumatologie, Hôpital de Hautepierre, Hôpitaux Universitaires de Strasbourg, 1, avenue Molière, 67098 Strasbourg cedex, France. marc.ardizzone@chru-strasbourg.fr
authors.forename: M
authors.initials: M
authors.lastname: Ardizzone
authors.forename: R M
authors.initials: RM
authors.lastname: Javier
authors.forename: J L
authors.initials: JL
authors.lastname: Kuntz
mesh_terms: D015415:Biomarkers; D001706:Biopsy; D005260:Female; D006801:Humans; D008297:Male; D010024:Osteoporosis / Q000145:classification / Q000473:pathology / Q000503:physiopathology*; D013167:Spondylitis, Ankylosing / Q000145:classification / Q000473:pathology / Q000503:physiopathology*
chemical_list: D015415:Biomarkers