Changes in bone mineral density in older men

Annualized percentage change in bone mineral density, measured by dual energy x-ray absorptiometry (DXA), in older men measured in the mid-lateral lumbar spine, femoral neck, or anterior-posterior lumbar spine projections. Bone density measured in the anterior-posterior (AP) projection, appears to increase. This is probably due to degenerative changes in the posterior spinous elements. Thus, anterior-posterior DXA is a poor technique for assessing bone density in older men.