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Table 1 Inclusion and exclusion criteria

From: The effectiveness of metal on metal hip resurfacing: a systematic review of the available evidence published before 2002

Treatment Inclusion/Exclusion Criteria
Metal on metal hip resurfacing A minimum of two years follow-up was applied; Studies not reporting the specified outcomes (ref. table 2) such as laboratory only studies were excluded.
Watchful waiting Observational data of people receiving WW with a follow-up of greater than five years were included
Total hip replacement RCTs or systematic reviews of RCTs with a minimum of five years follow-up of different methods of THR and systematic reviews of such trials