title: Author's reply to Hofman.
authors.affiliation: Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences, University of Oxford, Oxford OX3 7HE, UK.
authors.forename: Adrian
authors.initials: A
authors.lastname: Kendal
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000401:mortality*; D005260:Female; D006621:Hip Joint / Q000601:surgery*; D006801:Humans; D008297:Male; D061825:Metal-on-Metal Joint Prostheses / Q000706:statistics & numerical data*; D015207:Osteoarthritis, Hip / Q000601:surgery*