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. 2012 Aug 3;97(10):3593–3602. doi: 10.1210/jc.2012-1997

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Copyright © 2012 by The Endocrine Society

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Fig. 1. — Femoral neck size measurements and formulae to compute composite femoral neck strength indices. AB is the FNAL, the distance from the base of the greater trochanter to the apex of the femoral head, and DE is the FNW, the smallest thickness of the femoral neck along any line perpendicular to the femoral neck axis. C is where the femoral neck axis meets the inner pelvic rim. Composite femoral neck strength indices were computed using the following formulae: all three indices were recorded in units of grams per kilogram per meter. With BMD measured in grams per square centimeter, FNW and FNAL in centimeters, weight in kilograms, and height in meters, CSI and BSI were scaled by 100 to get values in units of grams per kilogram per meter.

Inline graphic — Femoral neck size measurements and formulae to compute composite femoral neck strength indices. AB is the FNAL, the distance from the base of the greater trochanter to the apex of the femoral head, and DE is the FNW, the smallest thickness of the femoral neck along any line perpendicular to the femoral neck axis. C is where the femoral neck axis meets the inner pelvic rim. Composite femoral neck strength indices were computed using the following formulae: all three indices were recorded in units of grams per kilogram per meter. With BMD measured in grams per square centimeter, FNW and FNAL in centimeters, weight in kilograms, and height in meters, CSI and BSI were scaled by 100 to get values in units of grams per kilogram per meter.