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A Unitary Model for Involutional Osteoporosis: Estrogen Deficiency Causes Both Type I and Type II Osteoporosis in Postmenopausal Women and Contributes to Bone Loss in Aging Men

Riggs, B. Lawrence, Khosla, Sundeep, Melton, L. Joseph·1998·Journal of Bone and Mineral Research

Abstract

We propose here a new unitary model for the pathophysiology of involutional osteoporosis that identifies estrogen (E) deficiency as the cause of both the early, accelerated and the late, slow phases of bone loss in postmenopausal women and as a contributing cause of the continuous phase of bone loss in aging men. The accelerated phase in women is most apparent during the first decade after menopause, involves disproportionate loss of cancellous bone, and is mediated mainly by loss of the direct restraining effects of E on bone cell function. The ensuing slow phase continues throughout life in women, involves proportionate losses of cancellous and cortical bone, and is associated with progressive secondary hyperparathyroidism. This phase is mediated mainly by loss of E action on extraskeletal calcium homeostasis which results in net calcium wasting and increases in the level of dietary calcium intake required to maintain bone balance. Because elderly men have low circulating levels of both bioavailable E and bioavailable testosterone (T) and because recent data suggest that E is at least as important as T in determining bone mass in aging men, E deficiency may also contribute substantially to the continuous bone loss of aging men. In both genders, E deficiency increases bone resorption and may also impair a compensatory increase in bone formation. For the most part, this unitary model is well supported by observational and experimental data and provides plausible explanations to traditional objections to a unitary hypothesis.

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Metadata

Authors
Riggs, B. L., Khosla, S., & Melton, L. J.
Venue
Journal of Bone and Mineral Research
Published
1998-05-01
Volume
13
Issue
5
Pages
763-773
ISSN
  • 0884-0431 (ISSN-L)
  • 1523-4681
OpenAlex
W2072231974
Cited by
1,143
References
6
FWCI
54.54
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: A Unitary Model for Involutional Osteoporosis: Estrogen Deficiency Causes Both Type I and Type II Osteoporosis in Postmenopausal Women and Contributes to Bone Loss in Aging Men. https://app.cochat.ai/papers/10.1359/jbmr.1998.13.5.763
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Riggs, B. L., Khosla, S., & Melton, L. J. (1998). A Unitary Model for Involutional Osteoporosis: Estrogen Deficiency Causes Both Type I and Type II Osteoporosis in Postmenopausal Women and Contributes to Bone Loss in Aging Men. Journal of Bone and Mineral Research. https://doi.org/10.1359/jbmr.1998.13.5.763

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Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.