Editorial Comment: Selected Papers from the 10th International Congress of Arthroplasty Registries.

Study protocol: the DUALITY trial-a register-based, randomized controlled trial to investigate dual-mobility cups in hip fracture patients. Poor knee-specific and generic patient-reported outcome measure scores at 6 months are associated with early revision knee arthroplasty: a study from the Australian Orthopaedic Association National Joint Replacement Registry. The seemingly large variation in changes in PROM scores across hip and knee arthroplasty registries was partially explained by differences in age, gender, and importantly, the patients' preoperative scores [[8]]. [Extracted from the article]