Osteoporosis is a metabolic bone disorder that is characterized by low bone mass and micro-architectural deterioration of bone tissue. Fractures of the proximal femur, the vertebrae and the distal radius are the most frequent osteoporotic fractures, although most fractures in the elderly are probably at least partly related to bone fragility. The incidence of fractures varies greatly by country, but on average up to 50% of women >50 years of age are at risk of fractures. Fractures severely affect the quality of life of an individual and are becoming a major public health problem owing to the ageing population. Postmenopausal osteoporosis, resulting from oestrogen deficiency, is the most common type of osteoporosis. Oestrogen deficiency results in an increase in bone turnover owing to effects on all types of bone cells. The imbalance in bone formation and resorption has effects on trabecular bone (loss of connectivity) and cortical bone (cortical thinning and porosity). Osteoporosis is diagnosed using bone density measurements of the lumbar spine and proximal femur. Preventive strategies to improve bone health include diet, exercise and abstaining from smoking. Fractures may be prevented by reducing falls in high-risk populations. Several drugs are licensed to reduce fracture risk by slowing down bone resorption (such as bisphosphonates and denosumab) or by stimulating bone formation (such as teriparatide). Improved understanding of the cellular basis for osteoporosis has resulted in new drugs targeted to key pathways, which are under development.
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R.E. was supported by a Senior Investigator Award from the National Institute of Health Research. L.C.H. was funded by Deutsche Forschungsgemeinschaft, SFB-655 and Transregio-67.
R.E. has received consulting fees from Amgen, AstraZeneca, GlaxoSmithKline (GSK), Immunodiagnostic Systems, Ono Pharma, Lilly and Roche Diagnostics, and grant support from Amgen, Immunodiagnostic Systems, Lilly and AstraZeneca. L.C.H. has received honoraria for serving on the advisory board and for giving lectures from Amgen, Eli Lilly, Merck, Novartis and UCB. B.L. has received consulting fees from Amgen, Merck, Eli Lilly and UCB, and grant support from Novo Nordisk, Eli Lilly and Orkla Health. I.R.R. has received research funding and honoraria from Merck, Amgen and Novartis. S.R.C. serves as a consultant to Amgen, Radius, Merck and Eli Lilly about the design of studies and interpretation of results, and has received grant support from Amgen for systematic review of medical risk factors for hip fracture. He has not received funds for lectures or other promotional activities. D.T.G. and T.W.O. have no conflicts of interest or competing interests to report.
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Eastell, R., O'Neill, T., Hofbauer, L. et al. Postmenopausal osteoporosis. Nat Rev Dis Primers 2, 16069 (2016). https://doi.org/10.1038/nrdp.2016.69
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