title: Arthroscopic evaluation of potential structure modifying activity of hyaluronan (Hyalgan) in osteoarthritis of the knee.
abstract: OBJECTIVE
  Several reported studies suggest that repeated intra-articular injections of hyaluronan result in sustained relief from pain and functional disability in patients with knee osteoarthritis. Several in vivo data suggest that hyaluronan might have a beneficial structural effect in osteoarthritis. The objective of the study was to evaluate the potential structure-modifying effects of Hyalgan (500-730 kDa molecular weight), a highly-purified sodium hyaluronate.
  
  
  METHODS
  Patients with painful knee osteoarthritis (ACR criteria) were enrolled in a prospective, controlled study of 1-year duration. After randomization, either conventional therapy or three cycles (every 3 months) of three intra-articular injections of Hyalgan (once a week during 2 weeks) were given. Clinical outcome was added using pain visual analog score (VAS), functional impairment: Lequesne's index, quality of life: arthritis impact measurement scale (AIMS2) and structural outcome using X-rays: joint space narrowing and arthroscopy: global assessment using VAS, SFA scoring and grading systems.
  
  
  RESULTS
  Of the 39 recruited patients, 36 completed the 1-year trial (19 in the Hyalgan group and 17 in the control group). There was no difference between groups at entry. Between-group comparison for changes in clinical parameters reached statistical significance for the quality of life index (AIMS2: -0.4 +/- 0.7 vs 0.2 +/- 0.9 in the Hyalgan and control groups respectively, P < 0.05). Deterioration in the structural parameters was less in the Hyalgan group, with a statistically significant difference for two of the three evaluated parameters (overall assessment of chondropathy: +5.1 +/- 12.7 vs 16.7 +/- 18.3, P = 0.016; SFA scoring system: +3.7 +/- 7.3 vs +9.0 +/- 11.5, P = 0.05) in the Hyalgan and control groups, respectively.
  
  
  CONCLUSIONS
  This study supports existing data concerning the favorable symptomatic effect of intra-articular injections of Hyalgan in osteoarthritis of the knee and suggests that repeated intra-articular injections of Hyalgan might delay the structural progression of the disease. Other studies are required to confirm these results and to determine the long-term monitoring of osteoarthritic patients using such local therapy.
authors.affiliation: Clinique de Rhumatologie Hôpital Cochin, Paris, France.
authors.forename: V
authors.initials: V
authors.lastname: Listrat
authors.forename: X
authors.initials: X
authors.lastname: Ayral
authors.forename: F
authors.initials: F
authors.lastname: Patarnello
authors.forename: J P
authors.initials: JP
authors.lastname: Bonvarlet
authors.forename: J
authors.initials: J
authors.lastname: Simonnet
authors.forename: B
authors.initials: B
authors.lastname: Amor
authors.forename: M
authors.initials: M
authors.lastname: Dougados
mesh_terms: D000704:Analysis of Variance; D001182:Arthroscopy; D005260:Female; D006801:Humans; D006820:Hyaluronic Acid / Q000008:administration & dosage* / Q000494:pharmacology*; D007270:Injections, Intra-Articular; D007719:Knee Joint; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000188:drug therapy* / Q000473:pathology; D010147:Pain Measurement; D011446:Prospective Studies; D011788:Quality of Life; D016896:Treatment Outcome
chemical_list: D006820:Hyaluronic Acid