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.
Level 5 - mechanism / opinion, no new human data
Narrative review and theoretical mechanism paper proposing a conceptual framework without new empirical data.
PubMed 9610739 · doi:10.1359/jbmr.1998.13.5.763
What was done
The authors synthesized observational and experimental literature to propose a unitary model for the pathophysiology of involutional osteoporosis across postmenopausal women and aging men.
What was found
No quantitative data or effect sizes are reported in the abstract. The model posits that estrogen deficiency causes early accelerated cancellous bone loss by removing direct restraint on bone cell function and late slow bone loss via extraskeletal calcium wasting and secondary hyperparathyroidism in women. It also posits that declining bioavailable estrogen contributes substantially to continuous bone loss in aging men, with estrogen deficiency stimulating bone resorption and impairing compensatory formation in both sexes.
Why it matters
The paper presents a unifying framework replacing the classic separation of type I and type II osteoporosis, establishing estrogen deficiency as a central pathophysiological mechanism for age-related bone loss in both sexes.
Limits
The abstract describes a narrative theoretical framework rather than a systematic review or primary empirical study. No sample sizes, patient cohorts, statistical analyses, or experimental effect estimates are reported.
Cited by
- supports Estrogen is osteoprotective, so postmenopausal decreases in estrogen increase bone resorption and osteoporosis risk.