Twenty-four months of follow-up in women with rebound-associated vertebral fractures after discontinuation of denosumab: a single-centre case series.

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To describe the densitometric and biochemical changes achieved with osteoactive treatment after 24months of follow-up in patients who suffered rebound-associated vertebral fractures (RAVFs) after Dmab discontinuation, and to report the occurrence of new vertebral and non-vertebral fractures. Patients with RAVFs who received retreatment (RT) for 24months were included. Bone mineral density (BMD) was assessed by dual-energy x-ray absorptiometry at the lumbar spine (LS), femoral neck (FN) and total hip (TH), along with C-terminal cross-linked telopeptide of type I collagen, osteocalcin, and bone alkaline phosphatase. Data were collected at the start of the RT and after 24months. Seven female patients were included. RT consisted in Dmab (n = 3), teriparatide (TPT) (n = 3) and zoledronate (Zol) (n = 1). At 24months, the mean BMD change was 2.2% at LS, 6.8% at FN and 3.8% at TH in the Dmab group, 7.5% at LS, 1.4% at FN and 3.7% at TH in the TPT group and, 5.0% at LS, 0.6% at FN and 3.9% at TH in the patient with Zol. After 24months of follow-up, no patient suffered new fractures. In this series of patients with RAVFs, we did not observe any new fractures and the BMD remained stable after 24months of RT. Future studies are needed to evaluate the most suitable treatment approach after RAVFs but these preliminary data suggest that all denosumab, zoledronate and teriparatide might be adequate options.