The table shows the types (cup and stem) of components removed during hip revision procedures reported to the NJR. A two-stage revision is a planned revision where, usually, the components would be removed during Stage 1 and new components implanted only during Stage 2. A Debridement and Implant Retention (DAIR) procedure is one where a revision has occurred and the components have remained in-situ, with no new implants being added.