Frisch NB, Rahman TM, Darrith B, et al. - In this study, functional outcome scores and revision rates were compared between metal-on-metal (MoM) and non-MoM total hip arthroplasty patients. Researchers included a cohort of 75 patients who had undergone implantation of the same dual modular hip arthroplasty between the years of 2004 and 2010. Individuals were subsequently assessed in 2015 to 2017 for joint revision history and functionality, as assessed by the Harris hip score (HHS). They did not enroll individuals requiring a revision arthroplasty in the HHS analysis. A sum of 49 individuals had MoM implants (65.3%), and 26 individuals had non-MoM implants (34.8%). Between cohorts, HHSs were not notably different. It was demonstrated that the MoM cohort had three times as many revisions as the non-MoM cohort, but given the numbers available, this difference did not reach significance. Given the clinical importance of these revision data, future research is needed to ascertain survivorship of the MoM vs non-MoM total hip arthroplasty at long-term follow-up.