Systematic reviews, randomised controlled trials (RCTs) and case series of a metal-on-metal resurfacing prosthesis with a cemented femoral component and uncemented acetabular component were eligible for inclusion. Studies had to report on survival of the implant (defined as the time to revision). Studies had to include a minimum of 75 HRA procedures (to ensure the learning curve was complete), use validated outcome measures, provide basic clinical details and report on the mechanism of failure.
The included studies considered the BHR device, ASR device, Conserve plus device, Cormet 2000 device, McMinn device and Durom device in patients aged 42 to 58 years.
Two reviewers independently performed study selection. Disagreements were resolved by consultation with a third reviewer.