Strange osteosclerosis at femoral neck

A 4 (1/2) yr follow-up of bone mineral density of a young woman revealed a dramatic 84% increase at the femoral neck, whereas the increase at the trochanter was only 11%. This finding suggested a very substantial accumulation of bone mineral in the neck region only. In the immediate repeated DXA scan, however, all the signs of this osteosclerosis disappeared. The primary reason for this strange DXA finding was a discrete contact failure in the control electronics of the scanner that confused the analysis of the scan data. The standard quality control was unable to detect this malfunction.