To the Editor: Atypical femur fractures appear to be an emerging adverse outcome of long-term use of bisphosphonates. Although analyses of epidemiological data suggest that subtrochanteric and diaphyseal fractures per se are rare,1,2 the true incidence of atypical fractures (a distinct subset of such fractures) is unknown.
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Markus Seibel is a member of advisory boards for Merck Sharp and Dohme, Novartis, Amgen and Sanofi-Aventis. He has also received funding from these companies for institutional research.