AGE-RELATED NORMAL UPTAKE OF TC-99M-MDP IN THE LOWER SPINE

Aim: The uptake of Tc-99m-MDP in the lower spine was quantified in con nection with ordinary bone scintigraphy. Methods: Fifty-seven women an d seventy-two men (aged 20-69 y), with no signs of metabolic or malign ant disease and no history of back pain or atraumatic fractures, were included in the study. Results: The women showed an increase in Tc-99m -MDP uptake from the age of 20 y to about 45 y with a decrease from th e time of menopause. In contrast: to women, the uptake in men showed a slight decrease from the age of 20 y to about 50 y and thereafter a m ore marked decrease was seen. The major difference between men and wom en is the high premenopausal uptake in the female skeleton. Conclusion : An understanding of age-related changes in Tc-99m-MDP uptake, which are indices of the skeletal metabolism, is of importance especially in prevention and treatment of osteoporosis, a common disorder in postme nopausal women.