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Early treatment with zoledronic acid prevents bone loss at the hip following acute spinal cord injury

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Abstract

Summary

Osteoporosis after spinal cord injury is common. Reductions in bone density are rapid and fracture rates are higher after injury. Early treatment with 4 mg zoledronic acid significantly reduced bone loss at the hip compared to untreated individuals in the first year. Treatment appeared safe and well tolerated.

Introduction

Bone mineral density (BMD) is lost rapidly following spinal cord injury (SCI), predominantly in the lower limbs. Bone turnover markers suggest an early increase in resorption.

Methods

A randomised, open-label study of 14 patients with acute SCI randomised to receive 4 mg IV zoledronic acid or standard treatment. BMD was measured by dual-X-ray absorptiometry at the lumbar spine and hip (femoral neck, total and trochanter) at baseline, 3, 6 and 12 months. Bone turnover markers (serum C-terminal telopeptide and Procollagen I N-terminal peptide and urinary N-terminal telopeptide/Cr ratio) were also measured.

Results

After 12 months, there was a significant difference in BMD between the groups at the total hip (12.4%, p = 0.005), trochanter (13.4%, p = 0.028) and lumbar spine (2.7%, p = 0.033). However, the difference between groups at the femoral neck was not significant (4.8%, p = 0.741). In the treated group, bone resorption was reduced and remained reduced up to 12 months. Other than flu-like symptoms immediately after the infusion, no adverse events were observed.

Conclusion

IV zoledronic acid is an effective and well-tolerated treatment to prevent bone mineral density loss at the total hip and trochanter for up to 12 months following SCI.

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Acknowledgements

We would like to acknowledge Mrs. V Shah and staff in the DXA department for their assistance with DXA scans, the staff on the spinal injuries unit for all their support and Dr. T Morris and Professor R Morris for their help with the statistical analysis. This study was funded by a grant from the National Osteoporosis Society and the Royal National Orthopaedic Hospital, Research and Development department.

Conflicts of interest

RW Keen has undertaken consultancy work for Novartis and received honoraria for educational activities.

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Correspondence to J. S. Bubbear.

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Bubbear, J.S., Gall, A., Middleton, F.R.I. et al. Early treatment with zoledronic acid prevents bone loss at the hip following acute spinal cord injury. Osteoporos Int 22, 271–279 (2011). https://doi.org/10.1007/s00198-010-1221-6

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  • DOI: https://doi.org/10.1007/s00198-010-1221-6

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