By Jaroslava Wendlova
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Title: Biomechanical Variables in evaluation of Fracture Risk
Author: Wendlova, Jaroslava (EDT)
Publisher: Nova technological know-how Pub Inc
Publication Date: 2012/02/29
Number of Pages: 143
Binding style: PAPERBACK
Library of Congress: 2011020240
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Extra info for Biomechanical Variables in Assessment of Fracture Risk
Int. 2004;15:847– 54. Gnudi S, Malavolta N, Testi D, Viceconti M: Differences in proximal femur geometry distinguish vertebral from femoral neck fractures in osteoporotic women. The Brit. J. Radiol. 2004;77:219–23. : Proximal femur geometry to detect and distinguish femoral neck fractures from trochanteric fractures in postmenopausal women. Osteoporos. Int. 2002;13:69–73. : Femur strength index predicts hip fracture independent of bone density and hip axis length. Osteoporos. Int. 2006; 17:593–9.
The values of geometrical variables of proximal femur are born with and not dependent on aging. At present, FSI is the only available variable, corresponding to biomechanical criteria of loading the bone by fall, whose values can be determined by DXA in a routine ambulatory practice. FSI integrates in itself three important bone characteristics: 1. BMD 2. bone geometry 3. elasticity and strength Whether the FSI variable value is calculated from the two-dimensional bone measurement by DXA, which in comparison with three-dimensional measurement has some inaccuracies, it is a value determining the bone quality much more precisely than BMD.
30 Table 5. 4050 Table 6. 290. 015 mm From the set of equations , of which is the variable FNS calculated, we have mathematically deduced, that the stress (ơ) in minimum cross sectional area of femoral neck, stressed by compressive force during a fall, is higher when: the angle theta variable rises, the angle alpha variable rises, HAL variable is longer, the patient´s weight and height rise It means, that the rising of these variable values increase the risk for fracture in femoral neck area by fall.