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Hologic q»R-4500A Left Hip U8.15a:3

Fig. 2-23. DXA proximal femur studies. Five regions of interest are defined. (A) Hologic QDR 4500 DXA study. Case courtesy of Hologic Inc., Bedford, MA. (B) Lunar Prodigy. Four regions of interest are labeled for emphasis on this study. The total region of interest, which is not outlined, includes the neck, trochanter, and shaft.

Fig. 2-23. DXA proximal femur studies. Five regions of interest are defined. (A) Hologic QDR 4500 DXA study. Case courtesy of Hologic Inc., Bedford, MA. (B) Lunar Prodigy. Four regions of interest are labeled for emphasis on this study. The total region of interest, which is not outlined, includes the neck, trochanter, and shaft.

The proximal femur studies shown in Fig.s 2-23A and B illustrate these regions, which are based on the anatomy shown in Figs. 2-22A and B. Ward's area is a region with which most physicians and technologists are not familiar. Ward's triangle, as it was originally called, is an anatomic region in the neck of the femur that is formed by the intersection of three trabecular bundles as shown in Fig. 2-24. In densitometry, Ward's t

Fig. 2-24. Ward's triangle, indicated by the letter W, is formed by the intersection of bundles of trabeculae in the femoral neck. (Adapted from McMinn RMH, Hutchings RT, Pegington J, and Abrahams PH. [1993] Colour Atlas of Human Anatomy, 3rd edition, p. 271. By permission of the publisher Mosby.)

triangle is a calculated region of low density in the femoral neck rather than a specific anatomic region. Because the region in densitometry is identified as a square, the region is generally now called Ward's area, instead of Ward's triangle. The total femur region of interest encompasses all of the individual regions: the femoral neck, Ward's area, the trochanteric region and the shaft. Each of these regions within this one bone contains a different percentage of trabecular and cortical bone as noted in Table 2-1.

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