title: Efficacy of rofecoxib, celecoxib, and acetaminophen in osteoarthritis of the knee: a randomized trial.
abstract: BACKGROUND
  Osteoarthritis (OA) is often treated with nonsteroidal anti-inflammatory drugs (NSAIDs), acetaminophen, or specific inhibitors of cyclooxygenase 2 (COX-2).
  
  
  OBJECTIVE
  To assess the relative therapeutic efficacy of rofecoxib, celecoxib, and acetaminophen in adults with OA.
  
  
  METHODS
  Randomized, parallel-group, double-blind trial, conducted from June 1999 to February 2000, in 29 clinical centers in the United States.
  
  
  METHODS
  Three hundred eighty-two patients aged at least 40 years who had OA of the knee that was previously treated with NSAIDs or acetaminophen.
  
  
  METHODS
  Patients were randomly assigned to receive rofecoxib, 12.5 mg/d (n = 96); rofecoxib, 25 mg/d (n = 95); celecoxib, 200 mg/d (n = 97); or acetaminophen, 4000 mg/d (n = 94) for 6 weeks.
  
  
  METHODS
  Assessments over days 1 to 6 and over 6 weeks included pain on walking, night pain, pain at rest, and morning stiffness as measured on a Western Ontario McMaster Universities Osteoarthritis Index (100-mm visual analog scale [VAS]) and global response to therapy compared among 4 treatment groups.
  
  
  RESULTS
  79% of patients completed the study. More patients treated with acetaminophen discontinued early due to lack of efficacy than patients treated with COX-2 inhibitors (31% vs 18%-19%). Efficacy assessed in the first 6 days of therapy showed greatest response to rofecoxib, 25 mg/d, followed by rofecoxib, 12.5 mg/d, celecoxib, and acetaminophen, respectively, in terms of relief of pain on walking (-32.2, - 29.0, - 26.4, and -20.6 mm change on the VAS; P</=.04 for all others vs acetaminophen; P =.05 for 25-mg rofecoxib vs celecoxib), rest pain (-21.8, - 18.6, - 15.5, and - 12.5 mm; P</=.02 for either dose of rofecoxib vs acetaminophen and P =.02 for rofecoxib, 25 mg/d, vs celecoxib), night pain (-25.2, - 22.0, - 18.7, and - 18.8 mm; P =.04 for rofecoxib, 25 mg/d, vs both acetaminophen and celecoxib), and morning stiffness (-30.4, - 28.4, - 25.7, and - 20.9 mm; P</=.02 for either dose of rofecoxib vs acetaminophen). Over 6 weeks, rofecoxib, 25 mg/d, provided greatest response for night pain (P<.002 vs celecoxib and P =.006 vs acetaminophen and P =.02 vs rofecoxib, 12.5 mg/d), composite pain subscale (P</=.03 vs all other treatments), stiffness subscale (P</=.04 vs celecoxib and acetaminophen), and physical function subscale (P =.001 vs acetaminophen). Global responses over 6 weeks showed a similar pattern (good or excellent response at week 6: 60%, 56%, 46%, and 39%, respectively; P</=.03 for rofecoxib, 25 mg/d, vs celecoxib and acetaminophen; P =.02 for rofecoxib, 12.5 mg/d, vs acetaminophen). All treatments were generally safe and well tolerated.
  
  
  CONCLUSIONS
  Rofecoxib, 25 mg/d, provided efficacy advantages over acetaminophen, 4000 mg/d, celecoxib, 200 mg/d, and rofecoxib, 12.5 mg, for symptomatic knee OA.
authors.affiliation: Merck & Co Inc, US Human Health, PO Box 4, West Point, PA 19486-0004, USA. gregory_geba@merck.com
authors.forename: Gregory P
authors.initials: GP
authors.lastname: Geba
authors.forename: Arthur L
authors.initials: AL
authors.lastname: Weaver
authors.forename: Adam B
authors.initials: AB
authors.lastname: Polis
authors.forename: Mary E
authors.initials: ME
authors.lastname: Dixon
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Schnitzer
mesh_terms: D000082:Acetaminophen / Q000627:therapeutic use*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000627:therapeutic use*; D000068579:Celecoxib; D051546:Cyclooxygenase 2; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors / Q000627:therapeutic use*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007527:Isoenzymes / Q000037:antagonists & inhibitors; D007783:Lactones / Q000627:therapeutic use*; D008297:Male; D008565:Membrane Proteins; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000188:drug therapy*; D010147:Pain Measurement; D011451:Prostaglandin-Endoperoxide Synthases; D011720:Pyrazoles; D013449:Sulfonamides / Q000627:therapeutic use*; D013450:Sulfones
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors; D007527:Isoenzymes; D007783:Lactones; D008565:Membrane Proteins; D011720:Pyrazoles; D013449:Sulfonamides; D013450:Sulfones; C116926:rofecoxib; D000082:Acetaminophen; D051546:Cyclooxygenase 2; C496540:PTGS2 protein, human; D011451:Prostaglandin-Endoperoxide Synthases; D000068579:Celecoxib