title: [Recommendations of EULAR on treatment of gonarthrosis. Report of a committee of the "Standing Committee for International Clinical Studies Including Therapeutic Trials (ESCIST)"].
abstract: BACKGROUND
  Osteoarthritis (OA) is the most common joint disease encountered throughout Europe. A task force for the EULAR standing committee for clinical trials met in 1998 to determine the methodological and logistical approach required for the development of evidence-based guidelines for treatment of knee OA. The guidelines were restricted to cover all currently available therapies for knee OA diagnosed either clinically and/or radiographically affecting any compartment of the knee.
  
  
  METHODS
  The first stage was the selection of treatment modalities to be considered. The second stage comprised a search of the electronic databases Medline and Embase using a combination of subject headings and key words. All European language publications in the form of systematic reviews, meta-analyses, randomized-controlled trials, controlled trials and observational studies were included. During stage three all of the relevant studies were quality scored. The summary statistics for validated outcome measures, when available, were recorded and where practical the numbers needed to treat (NNT) and the effect size (ES) for each therapy was calculated. The fourth stage involved determination of key clinical propositions by expert consensus employing a Delphi approach. The final stage involved ranking of these propositions according to the available evidence. A second set of propositions relating to a future research agenda was determined by expert consensus using a Delphi approach.
  
  
  RESULTS
  Over 2400 English language publications and 400 non-English language publications were identified. Seven hundred and forty four studies presented outcome data of the effects of specific treatments on knee OA. Quantitative analysis of treatment effect was possible in only 61 studies. Recommendations for the management of knee OA based on currently available data and expert opinion are presented. Proposals for a future research agenda are highlighted.
  
  
  CONCLUSIONS
  These are the first clinical guidelines on knee OA to combine an evidence-based approach and a consensus approach across a wide range of treatment modalities. It is apparent that only certain clinical propositions are supported by substantial research-based evidence, while others are not. There is thus an urgent need for future well designed trials to address key clinical questions.