59 year old postmenopausal Caucasian female on bisphosphonates since age 54 referred because of bone loss. Weight 183 #, Height 65 inches, unchanged. Initial repeat DXA at age 55 reported an 8% increase in BMD of the spine. At age 57, BMD was stable but DXA at age 59 reported a 7.5% loss of bone density in the spine, no change in the total hip or femoral neck. Recent scans shown below:
- What could explain bone loss in a patient who previously responded to medical therapy?
- Are there any technical problems with this scan?