65 year old Caucasian female, 61” tall, 248 pounds, BMI = 46.85. Bone density scan for estrogen deficiency in 2007 was normal. Repeat scan in 2009 found a 21% increase in bone density at the femoral neck. Both scans were completed on the same Hologic Discovery W. Patient is taking calcium supplements and a multiple vitamin, but is not taking any other bone-active medications.
- The interval change between 2007 and 2009 was -0.6% (not significant) in the total hip and +21% at the femoral neck (well above the LSC at this center). What could explain this discrepancy?