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Intractable Fractures of the Bilateral Proximal Ulnae After 8 Years of Zoledronate Treatment for Breast Cancer Bone Metastasis

Published:April 09, 2021DOI:https://doi.org/10.1016/j.jhsa.2021.02.012
      Long-term administration of bisphosphonates strongly suppresses osteoclastic bone resorption and rarely causes atypical fractures. This report presents a case of bilateral atypical ulnar fractures, following an 8-year course of zoledronate to treat breast cancer bone metastasis. Nonsurgical treatment for the left ulnar fracture failed, in spite of minimal displacement with callus formation at initial presentation. After failure of plate fixation with a pedicled vascularized bone graft, removal of osteosclerotic lesions and plate fixation with corticocancellous iliac bone graft resulted in bone healing, although the healing process took 1.5 years. Plate fixation for the contralateral fractured ulna was unsuccessful.

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