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Less osteoporosis with PCOS
Title: Bone mineral density, androgens, and the polycystic ovary:
The complex and controversial issue of androgenic influence in female bone
Author: J. Zborowski, et al.
Address: Pittsburgh, Pennsylvania
Source: The Journal of Clinical Endocrinology & Metabolism 85:3496-3506 (October) 2000
Summary: PCOS usually appears at the time of puberty and is believed to
be one of the most prominent endocrine disorders among women of reproductive age.
Because PCOS is so common and because it presents so early in life, it is thought
to be an important model for determining the effects of androgen and potentially
insulin on the attainment of maximal bone mass. Osteoporosis in women is not only
the result of aging and estrogen-dependent bone loss during menopause, but also
of peak skeletal mass attained and maintained during young adulthood. Therefore,
researchers prepared this review article with four objectives in mind: 1) to
summarize the available literature that explores the androgen-bone mass
relationship in normal women; 2) to assess the effects of PCOS, androgen excess
and androgen-estrogen balance on bone mass in women; 3) to examine study design
issues in relation to PCOS, androgen excess, and bone mass; and 4) to suggest
areas for future research related to the influence of PCOS, androgen excess, and
insulin on bone. The authors noted that various lines of evidence in both normal
women and those with PCOS tend to support an independent association of androgens
with peak bone mass attainment and maintenance in premenopausal women. Women with
PCOS tend to be overweight and that body weight is a key predictor of bone mass
and is collinear with sex steroids. Differences in regional body composition may
contribute to site-specific increases in BMD in PCOS. The higher bone density
seen in PCOS/hirsute women with regular menses suggests that estrogens and
androgens may interact to determine bone density. When there is sufficient
estrogen, androgens may have a positive effect on bone. It has not been
established that all women with PCOS are exempt from osteopenia because obesity,
hyperandrogenemia, and hyperinsulinemia, the characteristics of PCOS that may
have a positive influence on bone mass, are not present in every woman with PCOS.