DEXA Skeletal site heterogeneity

This episode explores the physiological mechanisms governing dual energy x ray absorptiometry site selection, emphasizing why the lumbar spine, proximal femur, and one third radius must be evaluated to capture skeletal heterogeneity. Listeners will review how trabecular bone, comprising most of the lumbar spine, drives rapid metabolic turnover and serves as an early indicator of estrogen deficiency or anabolic response. Conversely, dense cortical sites like the one third radius reveal distinct pathology, such as parathyroid hormone induced intracortical porosity in primary hyperparathyroidism. The discussion provides a big picture view of managing t score discordance and mitigating degenerative artifacts in aging populations.