Continuation of Patient Follow-up to 2 Years for the Pinnacle RSA and Pinnacle DM RSA Clinical Trials

The proposed study is a continuation of two prospective, multi-centre, non-controlled studies of the Pinnacle and Pinnacle Dual Mobility total hip arthroplasty systems, originally initiated by DePuy Synthes (DSJ\_2018\_02 and DJS\_2019\_02, respectively).

The primary study objective is to establish the mean superior migration of the Pinnacle Gription Sector acetabular cup, irrespective of standard or dual mobility articulation, using model-based radiostereometric analysis. As both prior studies utilize the same acetabular component, a combined analysis will be performed with an additional sub-analysis on those with a Pinnacle Dual Mobility system. Additional objectives include comparison of acetabular cup migration between surgical approach groups (posterolateral, direct lateral, direct anterior) at all time points, linear head penetration at 1 and 2 years, as well as functional and health status outcomes. Patients will be followed to the original end point of 2 years post-surgery using the same radiographic and patient-reported outcome measures at the primary studies; Harris Hip Score, Hip Evaluation, HOOS Jr., and Forgotten Joint Score. Results of this study will be published in orthopaedic journals.