title: [High-frequency ultrasound imaging of collagen-induced arthritis in rats].
abstract: OBJECTIVE
  To assess the performance of high-frequency ultrasound in evaluating articular lesions in a rat of model collagen-induced arthritis model (CIA).
  
  
  METHODS
  Sixty Wistar rats randomized into CIA group (n=50) and the control group (n=10), and in the former group, CIA was induced by immunization with collagen type II. On day 45, the ankle joint was assessed based on the arthritic index (AI) and examined with high-frequency ultrasound in all the rats. Histological evaluations of the joint were performed and the results were compared with ultrasound findings.
  
  
  RESULTS
  In CIA group, 62 ankles were confirmed pathologically to have synovitis with typical inflammatory cell infiltration and pannus formation. AI score-based diagnosis was confirmed in 42 ankles with a detection rate of 68% (42/62), significantly lower than the rate of 87% (54/62) with high-frequency ultrasound (P<0.05).
  
  
  CONCLUSIONS
  High-frequency ultrasound is an ideal method for observing CIA in rats in vivo. High-frequency ultrasound can show blood flow in rheumatoid arthritis and is useful in studies of RA synovial angiogenesis.
authors.affiliation: Department of Nuclear Medicine, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China. E-mail: 852129381@qq.com.
authors.forename: Haixia
authors.initials: H
authors.lastname: Song
authors.forename: Quanshi
authors.initials: Q
authors.lastname: Wang
mesh_terms: D000818:Animals; D001169:Arthritis, Experimental / Q000000981:diagnostic imaging*; D001172:Arthritis, Rheumatoid; D024043:Collagen Type II; D007596:Joints / Q000000981:diagnostic imaging; D009389:Neovascularization, Pathologic; D051381:Rats; D017208:Rats, Wistar; D014463:Ultrasonography
chemical_list: D024043:Collagen Type II