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Atypical femoral fracture in a bisphosphonate-naïve patient on denosumab for osteoporosis
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Atypical femoral fracture in a bisphosphonate-naïve patient on denosumab for osteoporosis
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Atypical femoral fracture in a bisphosphonate-naïve patient on denosumab for osteoporosis
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Journal Article
Atypical femoral fracture in a bisphosphonate-naïve patient on denosumab for osteoporosis
2022
Overview
SummaryA post-menopausal Caucasian woman sustained an atypical femoral fracture (AFF) after 5-years continuous denosumab for osteoporosis without prior bisphosphonate exposure. This is only the fifth case reported of AFF in a bisphosphonate-naïve patient receiving denosumab for osteoporosis. Although rare, physicians should consider AFF in patients taking denosumab even without prior bisphosphonate exposure.IntroductionDenosumab has demonstrated overwhelmingly favourable skeletal benefit/risk profile in managing post-menopausal osteoporosis with up to 10-year exposure in the extension of the pivotal FREEDOM randomised placebo-controlled trial. Four previous cases of atypical femoral fracture have been reported in bisphosphonate-naïve patients receiving denosumab for osteoporosis.MethodsWe present an 85-year-old Caucasian post-menopausal woman without prior fragility fracture who sustained unilateral atypical femoral fracture after 5-years continuous subcutaneous denosumab for osteoporosis. She had no prior bisphosphonate or glucocorticoid exposure and had known chronic kidney disease.ResultsX-ray scan demonstrated complete, non-comminuted left proximal femoral shaft fracture meeting radiographic criteria for an atypical femoral fracture. Computed tomography (CT) scan lower limbs revealed unusual side-by-side appearance of proximal and distal fragments of left proximal femur. DXA BMD was artefactually elevated at lumbar spine (1.504 g/cm2, T-score + 2.5) and low-normal at right femoral neck (0.856 g/cm2, T-score -1.0). Serum biochemistry showed renal impairment at baseline (eGFR 30 mL/min/1.73m2). Low-normal serum C telopeptide of type 1 collagen (CTX) (230 ng/L) indicated therapeutic suppression of bone resorption.ConclusionThe patient underwent intramedullary nailing of the femur and denosumab was ceased. This is only the fifth case reported of atypical femoral fracture in a bisphosphonate-naïve patient receiving denosumab for osteoporosis. Although rare, physicians should maintain a high index of suspicion for atypical femoral fracture in a patient taking denosumab even without prior bisphosphonate exposure.
