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Differences in bone mineral density and geometry in men and women: the Newcastle Thousand Families Study at 50 years old

¹ Department of Rheumatology, Musculoskeletal Unit, Freeman Hospital, Freeman Road, Newcastle upon Tyne NE7 7DN, ² Sir James Spence Institute of Child Health, School of Clinical Medical Sciences, University of Newcastle, The Royal Victoria Infirmary, Queen Victoria Road, Newcastle upon Tyne NE1 4LP and ³ Department of Rheumatology, University of Newcastle upon Tyne, Medical School, Framlington Place, Newcastle upon Tyne NE2 4HH, UK

View larger version (95K): [in a new window]   Figure 1. Measurement of the femoral neck shaft angle from the dual energy X-ray absorptiometry (DXA) scan printouts. The line AB is the hip axis marked by the scanner's software. A line is then drawn from C to D, in which C is the point at which the greater trochanter joins the femoral neck and D is the midpoint of the shaft at the bottom of the picture. E is the femoral neck shaft angle.

View larger version (22K): [in a new window]   Figure 2. Scatter plot of femoral neck shaft angle (NSAs) in the men (n=171) and women (n=218).

View larger version (20K): [in a new window]   Figure 3. Measurement, from the dual energy X-ray absorptiometry (DXA) scan printout, of neck shaft angle for a single cadaver femur. The femur had been positioned, with appropriate internal rotation, at a range of distances above the DXA scanning couch to characterize image distortion caused by the fan beam.