Subtrochanteric and diaphyseal femur fractures in patients treated with alendronate: A register-based national cohort study

Bo Abrahamsen, Pia Eiken, Richard Eastell

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    Abstrakt

    Alendronate (aln) is a potent bisphosphonate with a prolonged duration of action. Recent reports have found long-term aln use to be common in patients with subtrochanteric or proximal diaphyseal femur fracture, raising concerns that these fractures could be a consequence of excessive suppression of bone turnover. Two national observational register-based studies were performed: (1) cross-sectional study (N = 11,944) comparing age distribution, exposure, and trauma mechanisms between different types of proximal femur fractures and (2) matched cohort study in patients with prior nonhip fractures (N = 5187 + 10,374), testing the hypothesis that the increase in the risk of subsequent atypical femur fractures exceeded the increase in typical hip fractures. We also sought evidence of a dose-response relationship, where high adherence to or long-term use of aln led to more atypical femur fractures. We found that 7% of patients with atypical fractures were aln exposed, and the same was found for typical hip fractures. In the cohort study, the HR for subtrochanteric/ diaphyseal fracture with aln was 1.46 (0.91-2.35, p = 0.12) compared with 1.45 (1.21-1.74, p < 0001) for hip fracture after adjustment for comorbidity and co-medications. The risk was reduced by high adherence, and the ratio between hip and subtrochanteric/diaphyseal femur fractures was identical in aln-treated patients and the control cohort even in the limited number of patients who received long-term treatment. Subtrochanteric/diaphyseal femur fractures share the epidemiology and treatment response of classical hip fractures and are best classified as osteoporotic fractures.

    OriginalsprogEngelsk
    Sider (fra-til)1095-1102
    Antal sider8
    TidsskriftJournal of Bone and Mineral Research
    Vol/bind24
    Udgave nummer6
    DOI
    StatusUdgivet - 1 jun. 2009

    Fingeraftryk Udforsk hvilke forskningsemner 'Subtrochanteric and diaphyseal femur fractures in patients treated with alendronate: A register-based national cohort study' indeholder.

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