What advantage is there to be gained using large modular metal-on-metal bearings in routine primary hip replacement?

This report has been verified by one or more authors of the original publication.

100 patients who underwent primary total hip replacement were randomized to receive a large-head metal-on-metal bearing on a stem for primary hip replacement or a 28 mm diameter conventional metal-on polyethylene bearing. The results from 2 year follow-up indicated that both groups displayed significant improvements in regards to function, pain, and hip scores. However, it was found that patients who received the metal-on-metal bearing displayed significantly better patient satisfaction. Lastly, it was found that the metal ion levels were above safety thresholds in 20% of patients in the metal-on-metal group.