Abstract
Summary
A reduction in hip fracture incidence following population screening might reflect the effectiveness of anti-osteoporosis therapy, behaviour change to reduce falls, or both. This post hoc analysis demonstrates that identifying high hip fracture risk by FRAX was not associated with any alteration in falls risk.
Introduction
To investigate whether effectiveness of an osteoporosis screening programme to reduce hip fractures was mediated by modification of falls risk in the screening arm.
Methods
The SCOOP study recruited 12,483 women aged 70–85 years, individually randomised to a control (n = 6250) or screening (n = 6233) arm; in the latter, osteoporosis treatment was recommended to women at high risk of hip fracture, while the control arm received usual care. Falls were captured by self-reported questionnaire. We determined the influence of baseline risk factors on future falls, and then examined for differences in falls risk between the randomisation groups, particularly in those at high fracture risk.
Results
Women sustaining one or more falls were slightly older at baseline than those remaining falls free during follow-up (mean difference 0.70 years, 95%CI 0.55–0.85, p < 0.001). A higher FRAX 10-year probability of hip fracture was associated with increased likelihood of falling, with fall risk increasing by 1–2% for every 1% increase in hip fracture probability. However, falls risk factors were well balanced between the study arms and, importantly, there was no evidence of a difference in falls occurrence. In particular, there was no evidence of interaction (p = 0.18) between baseline FRAX hip fracture probabilities and falls risk in the two arms, consistent with no impact of screening on falls in women informed to be at high risk of hip fracture.
Conclusion
Effectiveness of screening for high FRAX hip fracture probability to reduce hip fracture risk was not mediated by a reduction in falls.
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Acknowledgments
The SCOOP study was designed and done with substantial input from the Norwich Clinical Trials Unit, UK, particularly the construction of the study database and provision of online randomisation (completed by Tony Dyer). We thank Margaret McWilliams and Ann Pulford, the study’s public and patient involvement representatives, for invaluable advice and support, and our trial steering committee and data monitoring committee. We also thank Ms. Wachirapan Narktang of the Division of Research, Department of Orthopaedic Surgery, Faculty of Medicine Siriraj Hospital for her assistance with artwork and illustration of the figure.
Other SCOOP Study team members are as follows: Birmingham: Nicola Crabtree, Helen Duffy, Jim Parle, Farzana Rashid, Katie Stant. Bristol: Kate Taylor, Clare Thomas (née Emmett). Manchester: Emma Knox, Cherry Tenneson, Helen Williams. Norwich: David Adams, Veronica Bion, Jeanette Blacklock, Tony Dyer. Sheffield: Selina Bratherton (née Simpson), Matt Fidler, Katharine Knight, Carol McGurk, Katie Smith, Stacey Young. Southampton: Karen Collins, Janet Cushnaghan. York: Catherine Arundel, Kerry Bell, Laura Clark, Sue Collins, Sarah Gardner, Natasha Mitchell.
Funding
This study was jointly funded by Versus Arthritis (formerly Arthritis Research UK) and the UK Medical Research Council. NMR’s time is financially supported by the National Institute for Health Research Collaboration for Leadership in Applied Health Research and Care West (NIHR CLAHRC West) at University Hospitals Bristol NHS Foundation Trust.
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Condurache, C.I., Chiu, S., Chotiyarnwong, P. et al. Screening for high hip fracture risk does not impact on falls risk: a post hoc analysis from the SCOOP study. Osteoporos Int 31, 457–464 (2020). https://doi.org/10.1007/s00198-019-05270-6
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DOI: https://doi.org/10.1007/s00198-019-05270-6