METHODS
Retrieval of published studies
A comprehensive search was undertaken in the Medline,
Pubmed, EMBASE, CINAHL, and PEDro databases and the
Cochrane controlled trials register to identify RCTs of
exercise. Medical subject headings used were ‘‘osteoarthritis,
knee’’ combined with ‘‘exercise’’ or ‘‘exercise therapy.’’
Search terms were exploded. Reference lists from retrieved
publications and review articles identified by the search
strategy above were also searched. The computerised searches
covered the period 1966 to September 2003. Hard copies of
retrieved publications were obtained.