Analysis Of The Correlation Between Density Of Three-Dimensional Finite Element Model Of BMD And Hip Fracture In The Aged

ObjectiveTo explore the relationship between bone mineral density and the aged hip fracture of proximal femur density of three-dimensional finite element model of the computer through the Mimics software, the finite element modeling, changes of hip bone mineral density in case of different ages old fractures were analyzed, verification and comparison, method and rule of site types and high-risk groups to explore the effective anticipation of hip fractures.Methods1. We selected 8 cases of hip fracture in the elderly,60 to 90 year old female patient, exclude serious heart and lung diseases and metabolic diseases, the exclusion of stroke and polio history, including 4 cases of femoral neck fracture,4 cases of intertrochanteric fracture; 3 cases of left limb,5 cases of right limbs.2. All cases of lumbar bone mineral density were measured, and the collection of the patients with bilateral hip GE64 row spiral CT image data (in DICOM format data), using Mimics 15.01 software in the computer through the proximal bone tissue threshold segmentation, region growth, lacuna filled, edit the masks, three-dimensional reconstruction, mesh and material assignment etc. step on the contralateral femur, three-dimensional image generated automatically, and smooth the model by parcel, smooth operation of tools, to establish a three-dimensional finite element model of physiological characteristics of close to the contralateral proximal femur, a finite element model is imported into ABAQUS software three-dimensional will be established, according to the material property model and empirical formula, automatic the model calculated can finally obtain the model density. Finally the application of SPSS18.0 software to statistical analysis on the data, draw the conclusion.Results1. The mean value and variance analysis of bone mineral density of lumbar spine bone mineral density of the lumbar spine:femoral neck fracture group was (-3.15±0.54) g/cm2, intertrochanteric bone mineral density of lumbar vertebrae fracture group is (-4.05±0.24) g/cm2, with statistically significant difference in two groups of bone mineral density (t-3.046, P=0.02).2. Analysis of the experimental model of density average value and the variance of femoral neck fracture group:experimental model of density of (1.34±0.06)*106, femoral intertrochanteric fractures group density is (1.15±0.02)*106, with statistical significance of two groups of experimental model of density difference (t=6.0083, P=0.03).3. Bone density instrument measure lumbar BMD values and the experimental model of femur density values into a linear positive correlation, r=0.881,P=0.004). Conclusion1. Through the finite element of three-dimensional reconstruction and Abaqus6.12 Minicsl5.01 analysis, regional division, quality and quantity of control mesh, material assignment method using rational, real property material property and femur on regional distribution model of the proximal similarity, the establishment of three-dimensional finite element model is more close to the proximal femur anatomy and physiology characteristics.2. According to the statistical results, the bone density measuring instrument of lumbar BMD values and the experimental model of femur density values into a linear positive correlation, suggesting that bone density and the elderly hip fracture of proximal femur of three-dimensional finite element model of the relationship between the density of positive linear correlation, which can provide a theoretical basis for the further study of the relationship between the site and bone mineral density in elderly hip fracture by finite element analysis method, method and rule of hip fracture in the high-risk population of pre judgment.