title: Osteoarthritis, magnetic resonance imaging, and biochemical markers: a one year prospective study.
abstract: OBJECTIVE
  To investigate the relation between biochemical markers of bone, cartilage, and synovial remodelling and the structural progression of knee osteoarthritis.
  
  
  METHODS
  62 patients of both sexes with knee osteoarthritis were followed prospectively for one year. From magnetic resonance imaging (MRI), done at baseline and after one year, the volume and thickness of cartilage of the femur, the medial tibia, and the lateral tibia were assessed. A whole organ magnetic resonance imaging score (WORMS) of the knee was calculated for each patient at baseline and at the one year visits. This score consists in a validated, semiquantitative scoring system for whole organ assessment of the knee in osteoarthritis using MRI. Biochemical markers (serum hyaluronic acid, osteocalcin, cartilage glycoprotein 39 (YKL-40), cartilage oligomeric matrix protein (COMP), and C-telopeptide of type I collagen (CTX-I), and urine C-telopeptide of type II collagen (CTX-II)) were measured at baseline and after three months.
  
  
  RESULTS
  Baseline markers were not correlated with one year changes observed in cartilage volume and thickness. However, an increase in CTX-II after three months was significantly correlated with a one year decrease in mean thickness of medial tibial and lateral tibial cartilage. Patients in the highest quartile of three month changes in CTX-II experienced a mean loss of 0.07 (0.08) mm of their medial thickness, compared with a mean increase of 0.05 (0.19) mm for patients in the lowest quartile (p = 0.04) Multiple regression analysis showed that high baseline levels of hyaluronic acid are predictive of a worsening in WORMS (p = 0.004).
  
  
  CONCLUSIONS
  These results suggest that a single measurement of serum hyaluronic acid or short term changes in urine CTX-II could identify patients at greatest risk of progression of osteoarthritis.
authors.affiliation: University of Liège, Department of Public Health, Epidemiology and Health Economics, CHU Sart-Tilman, 4000 Liège, Belgium. olivier.bruyere@ulg.ac.be
authors.forename: O
authors.initials: O
authors.lastname: Bruyere
authors.forename: J
authors.initials: J
authors.lastname: Collette
authors.forename: M
authors.initials: M
authors.lastname: Kothari
authors.forename: S
authors.initials: S
authors.lastname: Zaim
authors.forename: D
authors.initials: D
authors.lastname: White
authors.forename: H
authors.initials: H
authors.lastname: Genant
authors.forename: C
authors.initials: C
authors.lastname: Peterfy
authors.forename: N
authors.initials: N
authors.lastname: Burlet
authors.forename: D
authors.initials: D
authors.lastname: Ethgen
authors.forename: T
authors.initials: T
authors.lastname: Montague
authors.forename: C
authors.initials: C
authors.lastname: Dabrowski
authors.forename: J-Y
authors.initials: JY
authors.lastname: Reginster
mesh_terms: D054392:Adipokines; D000368:Aged; D015415:Biomarkers / Q000097:blood; D016723:Bone Remodeling; D064236:Cartilage Oligomeric Matrix Protein; D002358:Cartilage, Articular / Q000473:pathology; D000071451:Chitinase-3-Like Protein 1; D024043:Collagen Type II / Q000097:blood / Q000652:urine; D018450:Disease Progression; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D016326:Extracellular Matrix Proteins / Q000097:blood; D005260:Female; D006023:Glycoproteins / Q000097:blood; D006801:Humans; D006820:Hyaluronic Acid / Q000097:blood; D007719:Knee Joint / Q000473:pathology*; D037102:Lectins; D008279:Magnetic Resonance Imaging; D008297:Male; D064235:Matrilin Proteins; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000097:blood / Q000473:pathology* / Q000652:urine; D015675:Osteocalcin / Q000097:blood; D010446:Peptide Fragments / Q000097:blood / Q000652:urine; D011446:Prospective Studies; D012044:Regression Analysis; D013583:Synovial Membrane / Q000473:pathology
chemical_list: D054392:Adipokines; D015415:Biomarkers; C084533:CHI3L1 protein, human; D064236:Cartilage Oligomeric Matrix Protein; D000071451:Chitinase-3-Like Protein 1; D024043:Collagen Type II; D016326:Extracellular Matrix Proteins; D006023:Glycoproteins; D037102:Lectins; D064235:Matrilin Proteins; D010446:Peptide Fragments; C577553:TSP5 protein, human; D015675:Osteocalcin; D006820:Hyaluronic Acid