scholarly journals Validated finite element models of the proximal femur using two-dimensional projected geometry and bone density

2011 ◽  
Vol 104 (2) ◽  
pp. 168-174 ◽  
Author(s):  
Jorn Op Den Buijs ◽  
Dan Dragomir-Daescu
Keyword(s):  
Finite Element ◽  
Bone Density ◽  
Proximal Femur ◽  
Finite Element Models ◽  
Two Dimensional

An accurate estimation of bone density improves the accuracy of subject-specific finite element models

2008 ◽  
Vol 41 (11) ◽  
pp. 2483-2491 ◽  
Author(s):  
Enrico Schileo ◽  
Enrico Dall’Ara ◽  
Fulvia Taddei ◽  
Andrea Malandrino ◽  
Tom Schotkamp ◽  
...  
Keyword(s):  
Finite Element ◽  
Bone Density ◽  
Accurate Estimation ◽  
Finite Element Models ◽  
Subject Specific

Fracture Prediction for the Proximal Femur Using Finite Element Models: Part I—Linear Analysis

1991 ◽  
Vol 113 (4) ◽  
pp. 353-360 ◽  
Author(s):  
J. C. Lotz ◽  
E. J. Cheal ◽  
W. C. Hayes
Keyword(s):  
Finite Element ◽  
Fracture Risk ◽  
Strain Gage ◽  
Proximal Femur ◽  
Material Properties ◽  
The United States ◽  
Nonlinear Material ◽  
Finite Element Models ◽  
Model Predictions

Over 90 percent of the more than 250,000 hip fractures that occur annually in the United States are the result of falls from standing height. Despite this, the stresses associated with femoral fracture from a fall have not been investigated previously. Our objectives were to use three-dimensional finite element models of the proximal femur (with geometries and material properties based directly on quantitative computed tomography) to compare predicted stress distributions for one-legged stance and for a fall to the lateral greater trochanter. We also wished to test the correspondence between model predictions and in vitro strain gage data and failure loads for cadaveric femora subjected to these loading conditions. An additional goal was to use the model predictions to compare the sensitivity of several imaging sites in the proximal femur which are used for the in vivo prediction of hip fracture risk. In this first of two parts, linear finite element models of two unpaired human cadaveric femora were generated. In Part II, the models were extended to include nonlinear material properties for the cortical and trabecular bone. While there was poor correspondence between strain gage data and model predictions, there was excellent agreement between the in vitro failure data and the linear model, especially using a von Mises effective strain failure criterion. Both the onset of structural yielding (within 22 and 4 percent) and the load at fracture (within 8 and 5 percent) were predicted accurately for the two femora tested. For the simulation of one-legged stance, the peak stresses occurred in the primary compressive trabeculae of the subcapital region. However, for a simulated fall, the peak stresses were in the intertrochanteric region. The Ward’s triangle (basicervical) site commonly used for the clinical assessment of osteoporosis was not heavily loaded in either situation. These findings suggest that the intertrochanteric region may be the most sensitive site for the assessment of fracture risk due to a fall and the subcapital region for fracture risk due to repetitive activities such as walking.

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