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Abstract
Bone density of the radius was measured using both standard photon absorptiometry and X-ray computed tomography (CT) scanning, and of the femur using CT, in 21 young women with amenorrhea and estrogen deficiency due to hyperprolactinemia, 8 due to ovarian failure or weight loss, 17 postmenopausal women with bone fractures presumed to be due to osteoporosis, and 36 young normal controls. Bone density in the postmenopausal women was reduced by 18-20% in the radius and 11 % in the femur (p < 0.001). In the hyperprolactinemic group bone density was significantly reduced only in the femur (by 4%, p < 0.01). Bone density appeared to be reduced in the other young amenorrheic women both in the radius (by 2-5%) and the femur (3%) but the difference was not signficant, although the group was small. This and other studies of bone density suggest the need for prophylactic treatment to prevent osteoporosis in young women with amenorrhea and estrogen deficiency, whatever the cause.