ON THE INCIDENCE OF SENILE OSTEOPOROSIS

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Abstract
Roentgenograms of the dorsolumbar spines of 218 ambulatory women, age 45 and over, were evaluated and evidence of osteoporosis was found in 29%. Normal skeletal structure was noted in 124, or 57%. Only 4.6% had significant vertebral wedging or compression fractures. When incidence was determined according to successive five-year age groups, a progressive increase was found from 7% in the 45 to 49 year group to 46% for women age 60 to 64 years. The incidence dropped sharply to 28% for the 65 to 69 year age group and increased again to a maximum of 78% for women over age 75. This biphasic curve might be considered to represent the sum mated percentage incidence curves for 2 osteoporotic types: postmenopausal and senile. Thus, the former would be reflecting a disorder of selective occurrence both as to time and patient; the latter, a later and more universal occurrence. Greater sampling admittedly is needed.
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