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Previous Volume 349:327-334 July 24, 2003 Number 4 Next

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ABSTRACT

Background Bone loss increases after menopause. However, bone strength also depends on structural characteristics such as bone size. Whether bone size increases as a result of periosteal apposition and whether a strength index accounting for both bone density and bone size might predict the risk of fracture better than bone density alone are unclear.

Methods Bone mass and the skeletal structure of the distal radius were evaluated by single-photon absorptiometry every other year in 108 women, all of whom were followed from the time of menopause for a mean period of 15 years. Postmenopausal serum estradiol levels and fractures of the distal radius were noted.

Results The mean (±SD) annual decrease in bone mineral density was 1.9±0.7 percent. The medullary bone diameter increased annually by 1.1±0.9 percent, and the periosteal diameter by 0.7±0.3 percent; the strength index decreased by 0.7±0.7 percent. The expansion of the medullary diameter and the expansion of the periosteal diameter were correlated with one another (r = 0.54, P<0.001), and women in the highest quartile of medullary expansion had more loss of bone mineral density and greater periosteal apposition than women in the lowest quartile (P<0.001 for both comparisons). The postmenopausal serum estradiol level was correlated with changes in the periosteal diameter (r = –0.25, P=0.009) and with changes in bone mineral density (r = 0.34, P<0.001). A 1-SD decrement in the strength index at base line was associated with a risk ratio for fracture of the distal radius of 3.8 (95 percent confidence interval, 1.8 to 8.0).

Conclusions Increased bone loss after menopause is associated with increased periosteal apposition, which partially preserves bone strength. A strength index may be a helpful predictor of the risk of fracture.

Source Information

From the Departments of Orthopedics (H.G.A., O.J., M.K.K.) and Obstetrics and Gynecology (G.R.), Malmö University Hospital, Malmö, Sweden; and the Department of Orthopedic Surgery and the Biomechanics and Biomaterials Research Center, Indiana University, Indianapolis (C.H.T.).

Address reprint requests to Dr. Ahlborg at the Department of Orthopedics, Malmö University Hospital, SE-205 02 Malmö, Sweden, or at henrik.ahlborg{at}skane.se.

Full Text of this Article

Related Letters:

Bone Loss and Bone Size after Menopause
Mohamed A. M., Ahlborg H. G., Karlsson M., Johnell O.
Extract | Full Text | PDF  
N Engl J Med 2003; 349:1671, Oct 23, 2003. Correspondence

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