title: Clarification from the National Joint Registry.
authors.forename: Alexander J
authors.initials: AJ
authors.lastname: MacGregor
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D015207:Osteoarthritis, Hip / Q000401:mortality* / Q000601:surgery*