CN104240298A - Three-dimensional finite element constructing method based on medical image data LISS-DF to cure distal femur fracture - Google Patents
Three-dimensional finite element constructing method based on medical image data LISS-DF to cure distal femur fracture Download PDFInfo
- Publication number
- CN104240298A CN104240298A CN201410455989.5A CN201410455989A CN104240298A CN 104240298 A CN104240298 A CN 104240298A CN 201410455989 A CN201410455989 A CN 201410455989A CN 104240298 A CN104240298 A CN 104240298A
- Authority
- CN
- China
- Prior art keywords
- model
- steel plate
- liss
- screw
- femur
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention discloses a three-dimensional finite element constructing method based on medical image data LISS-DF to cure distal femur fracture. CT tomography is utilized to obtain the tomographic image data of an LISS steel plate and the tomographic image data of the normal sheep femur, three-dimensional medical images are divided, outline characteristic points of the three-dimensional medical images are extracted out, data are output, a surface geometrical model is initially constructed, a three-dimensional solid geometrical model is constructed, a solid geometrical model generated based on the medical images is established, the geometrical model generated based on the medical images is edited, a screw solid geometrical model generated based on the screw setting principle is established, a three-dimensional finite element model is constructed, and finally a plurality of three pyramid finite element models are generated to cure femoral fracture through different combined fixing methods between the sheep femur and near-end screws. The constructing method can form the three-dimensional finite element model containing the complete sheep femur, the distal femur fracture and the LISS-DF steel plate and the three-dimension finite element model providing the different combined fixing method for the single cortex and double cortexes of the near-end screws of the steel plate to cure the distal femur fracture. The constructing method can quickly and accurately construct the three-dimensional finite element model to cure the distal femur fracture through different combined fixing methods of the single cortex and the double cortexes of the near-end screws of the LISS-DF steel plate. Thus, the model constructing speed and the model quality are greatly improved.
Description
Technical field
The present invention relates to the three-dimensional finite element model construction method of a kind of sheep bone tissue and inner fixing device, particularly treat the construction method of the three-dimensional finite element model of Methods for Distal Femoral Fractures based on medical image LISS-DF.
Background technology
Along with China's communications and transportation and building industry develop rapidly, traffic hazard, fall from high altitude, weight injures by a crashing object etc., and Methods for Distal Femoral Fractures that high-energy violence wound causes increases in recent years suddenly, this illness lower limb trauma is comparatively serious, complicated, the reduction of the fracture, fixing comparatively difficulty, so Clinical Processing is comparatively thorny, curative effect is poor, even causes Limb Shortening and knee joint disorders etc.
Because Methods for Distal Femoral Fractures mostly is comminuted, unstable fracture caused by high-energy damage, and often involve joint, therefore adopt traditional incision reduction fixation method treatment Methods for Distal Femoral Fractures, wound is comparatively large, and fixing not strong, complication is more.And novel less invasive stabilization systems LISS (Less Invasive Stabilization System) combines the advantage of intramedullary nail with lock technology and biology bone plate technology, have that wound is little, stability is strong, meet the advantages such as biomechanics.
The key problem in technology that DF LISS steel plate is effectively fixed be select to have good attach performance steel plate and effective screw fix.Therefore, fixing failure is mainly fitted not tight due to steel plate and DF surface of bone, and screw is engaged not good with cortex bone.Be embodied in screw length deficiency or be screwed into the degree of depth not (mono cortex is fixed), do not penetrate contralateral cortex, screw resisting pull out forces weakens, and produces eccentric force, thus causes fixing unstable.And the long contralateral cortex (two cortex is fixed) that penetrates of screw, also may cause the damage of offside soft tissue and important blood vessels nerve.In addition, in simple preoperative X sheet or art, C arm location, often can only obtain two dimensional image, locate inaccurate, and increases the radiation dose of patient and doctor.
Therefore comparatively systematically carry out, to the correlative study of the combination of the registration of DF LISS Interal fixation fixed form different from screw, there is important clinical meaning.This invention is just based on this, set up based on medical image the three-dimensional finite element model that LISS-DF (Less Invasive Stabilization System – Distal Femur) treats Methods for Distal Femoral Fractures, provide reference frame for the selection of the different fixed form of follow-up biomechanical analysis, clinically proximal screw and LISS steel plate design improve.
Finite element method can carry out stress analysis to the structure of complexity, form, load and material mechanical performance and compare, and has the advantages such as cost is low, risk is little, repeatability is strong.Body bone tissue and internal fixation system thereof, have the advantages that profile is irregular, inner structure is complicated, classic method at all cannot accurately to its stress analysis, and applying three-dimensional finite element method analysis then accurately and all sidedly can obtain the stress result of bone tissue and each parts of fixed system.And the accuracy of finite element method analysis result depends on the levels of precision of institute's established model, therefore, how quickly and accurately computer simulation to be carried out to body bone tissue and internal fixtion implant system, set up focus and difficult point that three-dimensional finite element model has become Chinese scholars research.
Summary of the invention
The object of the present invention is to provide a kind of construction method for the treatment of the three-dimensional finite element model of Methods for Distal Femoral Fractures based on medical image LISS-DF, solve and adopt existing CT(Computed Tomography) scan and cannot obtain three-dimensional spatial information, screw various combination fixed form treatment Methods for Distal Femoral Fractures model process of establishing is complicated, the problems such as the position registration difficulty of steel plate, screw and femur, accurately set up the three-dimensional finite element model of LISS-DF proximal screw list two cortex various combination fixed form treatment Methods for Distal Femoral Fractures.
The three-dimensional finite element model construction method for the treatment of Methods for Distal Femoral Fractures based on medical image LISS-DF that the present invention proposes, concrete steps are as follows:
(1) CT tomoscan acquisition LISS steel plate is adopted to invest the faultage image data of normal sheep femur:
LISS steel plate is invested normal sheep lateral side of femur, and adopt spiral CT machine distally to be scanned perpendicular to the femur longitudinal axis by sheep femoral head near-end, Scan slice thickness is less than or equal to 1mm, is converted to jpeg form preservation output by scanning the standard DICOM formatted data obtained;
(2) Three Dimensional Medical Visualization, contour feature point extract and data output:
The CT faultage image LISS steel plate that step (1) obtains being invested normal sheep lateral side of femur imports open source software Image J (NIH, National Institutes of Health), first image conversion, image enhaucament and thresholding process are carried out respectively to sheep femur image and LISS-DF steel plate image, then the scope of sheep femur and LISS-DF steel plate objective area in image is selected respectively, finally edge extracting is carried out to the object boundary in selection area, the coordinate of the point obtained is stored respectively with txt form;
(3) surface geometry model Primary Construction:
In the Rhinoceros 4.0 software (U.S., Robert McNeel & Associates company) in the txt file of the respectively point coordinate of the complete sheep femur that obtains of steps for importing (2) and LISS-DF steel plate, selected point formation curve, set up curved surface, and derive respectively with stl file form, obtain the stl file of complete sheep femur and LISS-DF steel plate respectively;
(4) 3D solid geometric model builds:
In the common finite element stress and strain model software HyperMesh12.0(U.S., Altair company) in proceed as follows:
1. generate solid geometry model based on medical image: the first stl file of complete sheep femur that generates of steps for importing (3), the surface mesh respectively based on sheep femur generates multiple curved surface, sets up geometric model, is stored as separately an assembly; Then, same operation is carried out to LISS-DF steel plate, generate corresponding geometric model, same, be stored as separately an assembly;
2. the geometric model generated based on medical image is edited: normal sheep femur model is cut, generates corresponding sheep femoral fracture geometric model assembly;
3. screw solid geometry model is generated based on principles of pedicle screws: the curve setting up screw surface according to physical dimension, then curved surface is generated based on curve, finally set up the 3-D geometric model of screw, according to principles of pedicle screws, generating respectively can simultaneously through the screw model component of side seam cortex inside and outside sheep femoral shaft, namely two cortex is fixed, represent with " two ", with the screw model component extending only through cortex of bone outside sheep femoral shaft, namely mono cortex is fixed, represent with " list ", each screw is stored in different assembly respectively;
(5) three-dimensional finite element model builds:
In software HyperMesh, choose different entities geometric model assembly on demand to assemble, generate multiple model, described model is containing whole femur model, Methods for Distal Femoral Fractures model, LISS-DF steel plate model, and the model of proximal screw various combination fixed form treatment femoral fracture, each model forms by multiple assembly, implements following operation respectively to each model:
1. for an assembly, based on all surface forming 2D shell units;
2. between different assembly, interface node carries out node coupling to realize the connection between assembly;
3. tetrahedron element is created in each component internal.
The final multiple tetrahedral finite element model generating complete sheep femur and proximal screw various combination fixed form treatment femoral fracture respectively.
beneficial effect of the present invention:
The present invention comprises the three-dimensional finite element model of complete sheep femur, Methods for Distal Femoral Fractures and LISS-DF steel plate, and gives the three-dimensional finite element model of the two cortex various combination of steel plate proximal screw list totally 12 kinds of fixed form treatment Methods for Distal Femoral Fractures respectively.The present invention's application Image J software, Rhinoceros software and HyperMesh software can set up the three-dimensional finite element model of LISS-DF proximal screw list two cortex various combination fixed form treatment Methods for Distal Femoral Fractures quickly and accurately, substantially increase the speed of modeling and the quality of model, what institute's Modling model can be the different fixed form of proximal screw of different Methods for Distal Femoral Fractures situation preferably provides foundation, for the personalized design of further biomechanical analysis, implants and the feasibility of operation plan provide foundation and methodology reference.
Accompanying drawing explanation
Fig. 1 is normal femur three-dimensional finite element model (model one) rear view;
Fig. 2 is LISS-DF steel plate three-dimensional finite element model (model two) and nail numbering thereof;
Fig. 3 be DF spacing be 1.8cm 33-A3 type fracture three-dimensional finite element model (model three) rear view;
Fig. 4 be DF spacing be 1.8cm 33-A3 type fracture three-dimensional finite element model (model three) side view;
Fig. 5 is Methods for Distal Femoral Fractures, and the complete two cortex of LISS-DF steel plate near-end 4 pieces of screws fixes three-dimensional finite element model (model four) rear view;
Fig. 6 is Methods for Distal Femoral Fractures, and the complete two cortex of LISS-DF steel plate near-end 4 pieces of screws fixes three-dimensional finite element model (model four) side view;
Fig. 7 is Methods for Distal Femoral Fractures, LISS-DF steel plate near-end 4 pieces of screws single, double, two, two fixing three-dimensional finite element model (model five) rear view;
Fig. 8 is Methods for Distal Femoral Fractures, LISS-DF steel plate near-end 4 pieces of screws single, double, two, two fixing three-dimensional finite element model (model five) side view;
Fig. 9 is Methods for Distal Femoral Fractures, LISS-DF steel plate near-end 4 pieces of screw lists, single, double, two fixing three-dimensional finite element model (model six) rear view;
Figure 10 is Methods for Distal Femoral Fractures, LISS-DF steel plate near-end 4 pieces of screw lists, single, double, two fixing three-dimensional finite element model (model six) side view;
Figure 11 is Methods for Distal Femoral Fractures, LISS-DF steel plate near-end 4 pieces of screw lists, list, single, double fixing three-dimensional finite element model (model seven) rear view;
Figure 12 is Methods for Distal Femoral Fractures, LISS-DF steel plate near-end 4 pieces of screw lists, list, single, double fixing three-dimensional finite element model (model seven) side view;
Figure 13 is Methods for Distal Femoral Fractures, and LISS-DF steel plate near-end 4 pieces of screws are two, list, list, singly fixing three-dimensional finite element model (model eight) rear view;
Figure 14 is Methods for Distal Femoral Fractures, and LISS-DF steel plate near-end 4 pieces of screws are two, list, list, singly fixing three-dimensional finite element model (model eight) side view;
Figure 15 is Methods for Distal Femoral Fractures, and LISS-DF steel plate near-end 4 pieces of screws are two, two, list, single fixing three-dimensional finite element model (model nine) rear view;
Figure 16 is Methods for Distal Femoral Fractures, and LISS-DF steel plate near-end 4 pieces of screws are two, two, list, single fixing three-dimensional finite element model (model nine) side view;
Figure 17 is Methods for Distal Femoral Fractures, two, two, two, single fixing three-dimensional finite element model (model ten) rear view of LISS-DF steel plate near-end 4 pieces of screws;
Figure 18 is Methods for Distal Femoral Fractures, two, two, two, single fixing three-dimensional finite element model (model ten) side view of LISS-DF steel plate near-end 4 pieces of screws;
Figure 19 is Methods for Distal Femoral Fractures, single, double, the single, double fixing three-dimensional finite element model of LISS-DF steel plate near-end 4 pieces of screws (model 11) rear view;
Figure 20 is Methods for Distal Femoral Fractures, single, double, the single, double fixing three-dimensional finite element model of LISS-DF steel plate near-end 4 pieces of screws (model 11) side view;
Figure 21 is Methods for Distal Femoral Fractures, two, single, double, single fixing three-dimensional finite element model (the model 12) rear view of LISS-DF steel plate near-end 4 pieces of screws;
Figure 22 is Methods for Distal Femoral Fractures, two, single, double, single fixing three-dimensional finite element model (the model 12) side view of LISS-DF steel plate near-end 4 pieces of screws;
Figure 23 is Methods for Distal Femoral Fractures, single, double, two, single fixing three-dimensional finite element model (the model 13) rear view of LISS-DF steel plate near-end 4 pieces of screws;
Figure 24 is Methods for Distal Femoral Fractures, single, double, two, single fixing three-dimensional finite element model (the model 13) side view of LISS-DF steel plate near-end 4 pieces of screws;
Figure 25 is Methods for Distal Femoral Fractures, and LISS-DF steel plate near-end 4 pieces of screws are two, single, single, double fixing three-dimensional finite element model (model 14) rear view;
Figure 26 is Methods for Distal Femoral Fractures, and LISS-DF steel plate near-end 4 pieces of screws are two, single, single, double fixing three-dimensional finite element model (model 14) side view;
Figure 27 is Methods for Distal Femoral Fractures, and LISS-DF steel plate near-end 4 pieces of full mono cortexes of screw fix three-dimensional finite element model (model 15) rear view;
Figure 28 is Methods for Distal Femoral Fractures, and LISS-DF steel plate near-end 4 pieces of full mono cortexes of screw fix three-dimensional finite element model (model 15) side view.
Number in the figure: 1,2,3,4,5 be respectively the nail position in LISS steel plate, 6 is normal femur model assembly; 61 is femoral head and the femoral shaft model component of Methods for Distal Femoral Fractures; 62 is the DF condyles model component of Methods for Distal Femoral Fractures; 7 is LISS-DF steel plate model component, and wherein A, B, C, D, E, F, G are respectively the nail position in LISS steel plate; 7A is placed in the screw model component that steel plate nail A is fixed on DF condyles; 7D is placed in the screw model component that steel plate nail D is fixed on DF condyles; 7E is placed in the screw model component that steel plate nail E is fixed on DF condyles; 7F is placed in the screw model component that steel plate nail F is fixed on DF condyles; 712 for being placed in the fixing screw model component of steel plate nail 2 pairs of cortex; 713 for being placed in the fixing screw model component of LISS steel plate nail 3 pairs of cortex; 714 for being placed in the fixing screw model component of steel plate nail 4 pairs of cortex; 715 for being placed in the fixing screw model component of steel plate nail 5 pairs of cortex; 722 for being placed in the fixing screw model component of steel plate nail 2 mono cortex; 723 for being placed in the fixing screw model component of steel plate nail 3 mono cortex; 724 for being placed in the fixing screw model component of steel plate nail 4 mono cortex; 725 for being placed in the fixing screw model component of steel plate nail 5 mono cortex.
Embodiment
Described in detail below in conjunction with enforcement of the present invention.
Embodiment 1: the three-dimensional finite element model of complete sheep femur and LISS-DF proximal screw list two cortex various combination fixed form treatment Methods for Distal Femoral Fractures is set up, and comprises the following steps:
(1) CT tomoscan is adopted to obtain data: to adopt Shanghai Pudong New Arear Gongli Hospital's image department 16 to arrange spiral CT machine (Philips Brilliance 16), carry out following operation,
1. femur on the right side of an adult sheep is chosen, check all without morbid state through naked eyes and X-ray, reject the soft tissue on its surface, 5 hole LISS-DF steel plates (Xin Disi Medical Devices Co., Ltd. of Switzerland) are invested lateral side of femur, distally scanned perpendicular to the femur longitudinal axis by femoral head near-end, Scan slice thickness is 1mm, and it is 1.3mm/s that bed enters speed, and tube current and voltage are 275mA and 120.0kV;
2. jpeg form preservation output is converted to by scanning the standard DICOM formatted data obtained;
(2) Three Dimensional Medical Visualization, contour feature point extract and data output:
1. first, the CT faultage image LISS-DF steel plate that step (1) obtains being invested normal sheep femur imports Image J software;
2. then, image gray-scale transformation is carried out to sheep femur image, the parameter of amendment brightness and contrast, realize the image enhaucament to sheep femur target area, manually choose applicable threshold value and carry out Iamge Segmentation, utilize magic wand tool, choose sheep femur edge contour, remove in constituency and constituency exterior pixel, obtain the profile of the sheep femur that single pixel curve is formed, stored with txt form by the two-dimensional coordinate of point, wherein the point of femur outside surface and ossis inside surface need be extracted respectively and be stored in different file respectively;
3. last, above-mentioned steps is applied equally to LISS-DF steel plate and carries out the extraction of steel plate point coordinate, and store with txt form.
(3) surface geometry model Primary Construction:
1. first, in Rhinoceros 4.0 software, import the txt file of whole femur outer surface profile point coordinate.Selected unique point generates the curve by several point, and utility command is by multiple boundary curve or set up curved surface by plane curve, chooses curved surface, derives with stl file form;
2. secondly, import the txt file of marrow cavity of femur inner surface profile point coordinate, apply said method equally, set up curved surface, and derive with stl file form;
3. last, in kind import the txt file of LISS-DF steel plate point coordinate, set up curved surface, and derive with stl file form.
(4) 3D solid geometric model builds: in HyperMesh12.0 software, the stl file of the complete sheep femur that difference steps for importing (3) obtains and LISS-DF steel plate, surface mesh based on femur and steel plate generates multiple curved surface, sets up geometric model respectively; Based on complete sheep femur geometric model, geometric model is modified, splits the operations such as solid, set up the geometric model of Methods for Distal Femoral Fractures; Set up the geometric model of the screw that can be used for the different nail of steel plate, symbiosis becomes following 16 assemblies:
1. the normal sheep femur model assembly 6 be made up of multiple closed surface;
2. LISS-DF steel plate model component 7 is formed by multiple closed surface;
3. the femoral head that the 33-A3 type that the AO being 1.8cm in DF manufacture fracture spacing fractures somatotype is fractured and femoral shaft model component 61;
4. the DF condyles model component 62 that the 33-A3 type that the AO being 1.8cm in DF manufacture fracture spacing fractures somatotype is fractured;
5. the distal screw model component 7A that can be placed in the resected femur condyles of steel plate nail A is created;
6. the distal screw model component 7D that can be placed in the resected femur condyles of steel plate nail D is created;
7. the distal screw model component 7E that can be placed in the resected femur condyles of steel plate nail E is created;
8. the distal screw model component 7F that can be placed in the resected femur condyles of steel plate nail F is created;
9. the proximal screw model component 712 through side seam cortex (two cortex is fixed) inside and outside femoral shaft while can being placed in steel plate nail 2 is created;
10. the proximal screw model component 713 through side seam cortex (two cortex is fixed) inside and outside femoral shaft while can being placed in steel plate nail 3 is created;
through the proximal screw model component 714 of side seam cortex (two cortex is fixed) inside and outside femoral shaft while establishment can be placed in steel plate nail 4;
through the proximal screw model component 715 of side seam cortex (two cortex is fixed) inside and outside femoral shaft while establishment can be placed in steel plate nail 5;
establishment can be placed in the proximal screw model component 722 extending only through cortex of bone outside femoral shaft (mono cortex is fixed) of steel plate nail 2;
establishment can be placed in the proximal screw model component 723 extending only through cortex of bone outside femoral shaft (mono cortex is fixed) of steel plate nail 3;
establishment can be placed in the proximal screw model component 724 extending only through cortex of bone outside femoral shaft (mono cortex is fixed) of steel plate nail 4;
establishment can be placed in the proximal screw model component 725 extending only through cortex of bone outside femoral shaft (mono cortex is fixed) of steel plate nail 5.
(5) three-dimensional finite element model builds:
The geometric model assembly 6 of above-mentioned Methods for Distal Femoral Fractures is carried out registration with LISS-DF steel plate geometric model assembly 7, after registration, screw is assembled in steel plate and femur model, principles of pedicle screws is that distal screw is placed in steel plate nail A, D, E and F respectively, proximal screw is placed in steel plate nail 5,4,3 and 2, screw is horizontal position, between adjacent screw at an angle, forms following 15 kinds of models altogether:
1. the normal femur model assembly 6 of model one;
2. model two LISS-DF steel plate model component 7;
3. model three Methods for Distal Femoral Fractures model, is made up of femoral head and femoral shaft model component 61 and DF condyles model component 62;
4. model four Methods for Distal Femoral Fractures, LISS-DF steel plate component 7 invests lateral side of femur, DF steel plate is fixed on femur condyle assembly 62 by 4 pieces of screws (screw model component 7A, screw model component 7D, screw model component 7E and screw model component 7F), and near end of thighbone steel plate is fixed on femoral shaft assembly 61 by the complete two cortex of 4 pieces of screws (screw model component 715, screw model component 714, screw model component 713 and screw model component 712);
5. model five Methods for Distal Femoral Fractures, LISS-DF steel plate component 7 invests lateral side of femur, DF steel plate is fixed on femur condyle assembly 62 by 4 pieces of screws (screw model component 7A, screw model component 7D, screw model component 7E and screw model component 7F), and the screw model component 713 that screw model component 714, two cortex that screw model component 725, two cortex that near end of thighbone steel plate is fixed by mono cortex are fixed are fixed and the fixing screw model component 712 of two cortex are fixed on femoral shaft assembly 61;
6. model six Methods for Distal Femoral Fractures, LISS-DF steel assembly 7 invests lateral side of femur, DF steel plate is fixed on femur condyle assembly 62 by 4 pieces of screws (screw model component 7A, screw model component 7D, screw model component 7E and screw model component 7F), and the screw model component 713 that screw model component 724, two cortex that screw model component 725, mono cortex that near end of thighbone steel plate is fixed by mono cortex are fixed are fixed and the fixing screw model component 712 of two cortex are fixed on femoral shaft assembly 61;
7. model seven Methods for Distal Femoral Fractures, LISS-DF steel plate (assembly 7) invests lateral side of femur, DF steel plate is fixed on femur condyle assembly 62 by 4 pieces of screws (screw model component 7A, screw model component 7D, screw model component 7E and screw model component 7F), and the screw model component 723 that screw model component 724, mono cortex that screw model component 725, mono cortex that near end of thighbone steel plate is fixed by mono cortex are fixed are fixed and fixing screw model component 712 mode of two cortex are fixed on femoral shaft assembly 61;
8. model eight Methods for Distal Femoral Fractures, LISS-DF steel plate component 7 invests lateral side of femur, DF steel plate is fixed on femur condyle assembly 62 by 4 pieces of screws (screw model component 7A, screw model component 7D, screw model component 7E and screw model component 7F), and the screw model component 723 that screw model component 724, mono cortex that screw model component 715, mono cortex that near end of thighbone steel plate is fixed by two cortex are fixed are fixed and the fixing screw model component 722 of mono cortex are fixed on femoral shaft assembly 61;
9. model nine Methods for Distal Femoral Fractures, LISS-DF steel plate component 7 invests lateral side of femur, DF steel plate is fixed on femur condyle assembly 62 by 4 pieces of screws (screw model component 7A, screw model component 7D, screw model component 7E and screw model component 7F), and the screw model component 723 that screw model component 714, mono cortex that screw model component 715, two cortex that near end of thighbone steel plate is fixed by two cortex are fixed are fixed and the fixing screw model component 722 of mono cortex are fixed on femoral shaft assembly 61;
10. model ten Methods for Distal Femoral Fractures, LISS-DF steel plate component 7 invests lateral side of femur, DF steel plate is fixed on femur condyle assembly 62 by 4 pieces of screws (screw model component 7A, screw model component 7D, screw model component 7E and screw model component 7F), and the screw model component 713 that screw model component 714, two cortex that screw model component 715, two cortex that near end of thighbone steel plate is fixed by two cortex are fixed are fixed and the fixing screw model component 722 of mono cortex are fixed on femoral shaft assembly 61;
model 11 Methods for Distal Femoral Fractures, LISS-DF steel plate component 7 invests lateral side of femur, DF steel plate is fixed on femur condyle assembly 62 by 4 pieces of screws (screw model component 7A, screw model component 7D, screw model component 7E and screw model component 7F), and the screw model component 723 that screw model component 714, mono cortex that screw model component 725, two cortex that near end of thighbone steel plate is fixed by mono cortex are fixed are fixed and the fixing screw model component 712 of two cortex are fixed on femoral shaft assembly 61;
model 12 Methods for Distal Femoral Fractures, LISS-DF steel plate component 7 invests lateral side of femur, DF steel plate is fixed on femur condyle assembly 62 by 4 pieces of screws (screw model component 7A, screw model component 7D, screw model component 7E and screw model component 7F), and the screw model component 713 that screw model component 724, two cortex that screw model component 715, mono cortex that near end of thighbone steel plate is fixed by two cortex are fixed are fixed and the fixing screw model component 722 of mono cortex are fixed on femoral shaft assembly 61;
model 13 Methods for Distal Femoral Fractures, LISS-DF steel plate component 7 invests lateral side of femur, DF steel plate is fixed on femur condyle assembly 62 by 4 pieces of screws (screw model component 7A, screw model component 7D, screw model component 7E and screw model component 7F), and the screw model component 713 that screw model component 714, two cortex that screw model component 725, two cortex that near end of thighbone steel plate is fixed by mono cortex are fixed are fixed and the fixing screw model component 722 of mono cortex are fixed on femoral shaft assembly 61;
model 14 Methods for Distal Femoral Fractures, LISS-DF steel plate component 7 invests lateral side of femur, DF steel plate is fixed on femur condyle assembly 62 by 4 pieces of screws (screw model component 7A, screw model component 7D, screw model component 7E and screw model component 7F), and the screw model component 723 that screw model component 724, mono cortex that screw model component 715, mono cortex that near end of thighbone steel plate is fixed by two cortex are fixed are fixed and the fixing screw model component 712 of two cortex are fixed on femoral shaft assembly 61;
model 15 Methods for Distal Femoral Fractures, LISS-DF steel plate component 7 invests lateral side of femur, DF steel plate is fixed on femur condyle assembly 62 by 4 pieces of screws (screw model component 7A, screw model component 7D, screw model component 7E and screw model component 7F), and the screw model component 723 that screw model component 724, mono cortex that screw model component 725, mono cortex that near end of thighbone steel plate is fixed by mono cortex are fixed are fixed and the fixing screw model component 722 of mono cortex are fixed on femoral shaft assembly 61.
All following operation is carried out to each model in above-mentioned 15 kinds of models: first, based on surface curve, two-dimensional grid (shell unit) is created respectively to all component that a model comprises, be connected in the mode of node coupling between different assembly; Then, tetrahedral solid elements is created in each component internal; Finally, give its corresponding material properties to each component internal tetrahedron element, export the tetrahedron element of each assembly with the input file CDB form of software ANSYS ANSYS respectively.
The model obtained by above-mentioned steps can directly apply to follow-up mechanical analysis, when its result can be clinical treatment Methods for Distal Femoral Fractures, selects rational screw length and fixed form, reduces the generation of postoperative related complication, provide theoretical foundation.The biomechanics simulation result of above-mentioned model, in conjunction with clinical experience, is treated this type of common disease for the novel less invasive stabilization systems LISS of guidance and help clinical practice from now on, is had important clinical meaning.
Claims (1)
1. treat the three-dimensional finite element model construction method of Methods for Distal Femoral Fractures based on medical image LISS-DF, it is characterized in that concrete steps are as follows:
(1) CT tomoscan acquisition LISS steel plate is adopted to invest the faultage image data of normal sheep femur:
LISS steel plate is invested normal sheep lateral side of femur, and adopt spiral CT machine distally to be scanned perpendicular to the femur longitudinal axis by sheep femoral head near-end, Scan slice thickness is less than or equal to 1mm, is converted to jpeg form preservation output by scanning the standard DICOM formatted data obtained;
(2) Three Dimensional Medical Visualization, contour feature point extract and data output:
The CT faultage image LISS steel plate that step (1) obtains being invested normal sheep lateral side of femur imports open source software Image J (NIH, National Institutes of Health), first image conversion, image enhaucament and thresholding process are carried out respectively to sheep femur image and LISS-DF steel plate image, then the scope of sheep femur and LISS-DF steel plate objective area in image is selected respectively, finally edge extracting is carried out to the object boundary in selection area, the coordinate of the point obtained is stored respectively with txt form;
(3) surface geometry model Primary Construction:
In the Rhinoceros 4.0 software (U.S., Robert McNeel & Associates company) in the txt file of the respectively point coordinate of the complete sheep femur that obtains of steps for importing (2) and LISS-DF steel plate, selected point formation curve, set up curved surface, and derive respectively with stl file form, obtain the stl file of complete sheep femur and LISS-DF steel plate respectively;
(4) 3D solid geometric model builds:
In the common finite element stress and strain model software HyperMesh12.0(U.S., Altair company) in proceed as follows:
1. generate solid geometry model based on medical image: the first stl file of complete sheep femur that generates of steps for importing (3), the surface mesh respectively based on sheep femur generates multiple curved surface, sets up geometric model, is stored as separately an assembly; Then, same operation is carried out to LISS-DF steel plate, generate corresponding geometric model, be stored as equally separately an assembly;
2. the geometric model generated based on medical image is edited: normal sheep femur model is cut, generates corresponding sheep femoral fracture geometric model assembly;
3. screw solid geometry model is generated based on principles of pedicle screws: the curve setting up screw surface according to physical dimension, then curved surface is generated based on curve, finally set up the 3-D geometric model of screw, according to principles of pedicle screws, generating respectively can simultaneously through the screw model component of side seam cortex inside and outside sheep femoral shaft, namely two cortex is fixed, represent with " two ", with the screw model component extending only through cortex of bone outside sheep femoral shaft, namely mono cortex is fixed, represent with " list ", each screw is stored in different assembly respectively;
(5) three-dimensional finite element model builds:
In software HyperMesh, choose different entities geometric model assembly on demand to assemble, generate multiple model, described model is containing whole femur model, Methods for Distal Femoral Fractures model, LISS-DF steel plate model, and the model of proximal screw various combination fixed form treatment femoral fracture, each model forms by multiple assembly, implements following operation respectively to each model:
1. for an assembly, based on all surface forming 2D shell units;
2. between different assembly, interface node carries out node coupling to realize the connection between assembly;
3. tetrahedron element is created in each component internal;
The final multiple tetrahedral finite element model generating sheep femur and proximal screw various combination fixed form treatment femoral fracture respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410455989.5A CN104240298A (en) | 2014-09-10 | 2014-09-10 | Three-dimensional finite element constructing method based on medical image data LISS-DF to cure distal femur fracture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410455989.5A CN104240298A (en) | 2014-09-10 | 2014-09-10 | Three-dimensional finite element constructing method based on medical image data LISS-DF to cure distal femur fracture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104240298A true CN104240298A (en) | 2014-12-24 |
Family
ID=52228299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410455989.5A Pending CN104240298A (en) | 2014-09-10 | 2014-09-10 | Three-dimensional finite element constructing method based on medical image data LISS-DF to cure distal femur fracture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104240298A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104820760A (en) * | 2015-05-20 | 2015-08-05 | 河海大学常州校区 | Method for designing intramedullary nails based on optimized curvature |
| CN106709136A (en) * | 2016-11-21 | 2017-05-24 | 河海大学常州校区 | Simplified femoral shaft fracture internal fixation system model and analysis method thereof |
| CN106777582A (en) * | 2016-12-01 | 2017-05-31 | 哈尔滨理工大学 | A kind of long bone fracture healing analogue system based on tissue differentiation |
| CN107518940A (en) * | 2017-08-23 | 2017-12-29 | 河海大学常州校区 | For the screw optimization topological analysis method and system in bone plate internal fixation system |
| CN107945278A (en) * | 2017-12-14 | 2018-04-20 | 桂林电子科技大学 | The three-dimensionalreconstruction and finite element method of a kind of organism structure |
| CN108852511A (en) * | 2018-04-26 | 2018-11-23 | 北京罗森博特科技有限公司 | The automatic planning and device of implant for into bones optimal location |
| CN109528282A (en) * | 2018-10-22 | 2019-03-29 | 沙洲职业工学院 | A kind of preparation method customizing shin bone locking steel plate |
| CN109984840A (en) * | 2019-04-17 | 2019-07-09 | 杨圣 | The model and method of short-segment pedicle screw instrumentation and the quasi- treatment thoracolumbar fracture of Schanz dolly set |
| CN116664800A (en) * | 2023-08-01 | 2023-08-29 | 中国人民解放军总医院第六医学中心 | Finite element bone strength assessment method in intra-skeletal fixation mode |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102018560A (en) * | 2010-12-17 | 2011-04-20 | 任绍东 | Digitization bone fracture plate and manufacturing method thereof |
| CN102961176A (en) * | 2012-12-13 | 2013-03-13 | 哈尔滨理工大学 | Method for selecting optimal inner fixing modes for femur and neck bone fractures |
| CN103150442A (en) * | 2013-03-15 | 2013-06-12 | 常州华森医疗器械有限公司 | Manufacturing technique of digitally customizing orthopedic implants |
| CN103871104A (en) * | 2014-03-27 | 2014-06-18 | 同济大学 | Method for constructing three-dimension finite element model which treats tibial plateau posterior-lateral fracture with different inner fixing manners |
-
2014
- 2014-09-10 CN CN201410455989.5A patent/CN104240298A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102018560A (en) * | 2010-12-17 | 2011-04-20 | 任绍东 | Digitization bone fracture plate and manufacturing method thereof |
| CN102961176A (en) * | 2012-12-13 | 2013-03-13 | 哈尔滨理工大学 | Method for selecting optimal inner fixing modes for femur and neck bone fractures |
| CN103150442A (en) * | 2013-03-15 | 2013-06-12 | 常州华森医疗器械有限公司 | Manufacturing technique of digitally customizing orthopedic implants |
| CN103871104A (en) * | 2014-03-27 | 2014-06-18 | 同济大学 | Method for constructing three-dimension finite element model which treats tibial plateau posterior-lateral fracture with different inner fixing manners |
Non-Patent Citations (1)
| Title |
|---|
| 龚璐璐等: "LISS钢板治疗股骨远端骨折有限元建模及分析", 《生物医学工程学进展》 * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104820760A (en) * | 2015-05-20 | 2015-08-05 | 河海大学常州校区 | Method for designing intramedullary nails based on optimized curvature |
| CN104820760B (en) * | 2015-05-20 | 2018-01-12 | 河海大学常州校区 | A kind of intramedullary nail design method based on optimization curvature |
| CN106709136A (en) * | 2016-11-21 | 2017-05-24 | 河海大学常州校区 | Simplified femoral shaft fracture internal fixation system model and analysis method thereof |
| CN106777582A (en) * | 2016-12-01 | 2017-05-31 | 哈尔滨理工大学 | A kind of long bone fracture healing analogue system based on tissue differentiation |
| CN107518940A (en) * | 2017-08-23 | 2017-12-29 | 河海大学常州校区 | For the screw optimization topological analysis method and system in bone plate internal fixation system |
| CN107945278A (en) * | 2017-12-14 | 2018-04-20 | 桂林电子科技大学 | The three-dimensionalreconstruction and finite element method of a kind of organism structure |
| CN108852511A (en) * | 2018-04-26 | 2018-11-23 | 北京罗森博特科技有限公司 | The automatic planning and device of implant for into bones optimal location |
| CN108852511B (en) * | 2018-04-26 | 2019-06-07 | 北京罗森博特科技有限公司 | The automatic planning and device of implant for into bones optimal location |
| CN109528282A (en) * | 2018-10-22 | 2019-03-29 | 沙洲职业工学院 | A kind of preparation method customizing shin bone locking steel plate |
| CN109984840A (en) * | 2019-04-17 | 2019-07-09 | 杨圣 | The model and method of short-segment pedicle screw instrumentation and the quasi- treatment thoracolumbar fracture of Schanz dolly set |
| CN116664800A (en) * | 2023-08-01 | 2023-08-29 | 中国人民解放军总医院第六医学中心 | Finite element bone strength assessment method in intra-skeletal fixation mode |
| CN116664800B (en) * | 2023-08-01 | 2023-09-29 | 中国人民解放军总医院第六医学中心 | Finite element bone strength assessment method in intra-skeletal fixation mode |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104240298A (en) | Three-dimensional finite element constructing method based on medical image data LISS-DF to cure distal femur fracture | |
| CN101816590B (en) | Method for manufacturing navigation template of human bone surgery and female die thereof | |
| Merema et al. | The design, production and clinical application of 3D patient-specific implants with drilling guides for acetabular surgery | |
| Zizelmann et al. | Computer-assisted reconstruction of orbital floor based on cone beam tomography | |
| CN103099680B (en) | Production method for guide template | |
| CN103871104B (en) | Method for constructing three-dimension finite element model which treats tibial plateau posterior-lateral fracture with different inner fixing manners | |
| CN108433851B (en) | Preparation method of tumor type prosthesis at middle-upper section of tibia | |
| CN103690278A (en) | 3D (three-dimensional) printing technology-based preparation method for personalized bionic vertebral column system | |
| Yu et al. | A feasibility study into the use of three-dimensional printer modelling in acetabular fracture surgery | |
| CN103099669B (en) | Single-side pedicle screw-driving auxiliary device and manufacturing method thereof | |
| CN107252364B (en) | 3D printed humerus model and preparation method thereof | |
| Šljivić et al. | Implemenation of FEM and rapid prototyping in maxillofacial surgery | |
| Chen et al. | A Novel Computer-Aided Approach for Parametric Investigation of Custom Design of Fracture Fixation Plates. | |
| CN102451035A (en) | Internal fixation therapeutic method of tibial fracture | |
| Rashid et al. | Geometrical model creation methods for human humerus bone and modified cloverleaf plate | |
| RU2016105166A (en) | Method of corrective femur osteotomy | |
| CN105434029A (en) | Molding technology for orthopedics department implantation material | |
| CN104778322A (en) | Average femoral model construction method based on statistical information | |
| CN104820760A (en) | Method for designing intramedullary nails based on optimized curvature | |
| Yu et al. | The Effect on the Fracture Healing following femoral Neck shortening after osteoporotic femoral Neck fracture treated with internal fixation: finite element analysis | |
| CN108577967A (en) | A method of the description information for generating location of operation guider | |
| Wang et al. | Numerical simulation research to both the external fixation surgery scheme of intertrochanteric fracture and the healing process, and its clinical application | |
| CN105640646A (en) | Screw implantation guide device for closed reduction of pelvic anterior ring fracture and manufacturing method thereof | |
| CN105844702A (en) | 3D printing technique-based preoperative knee joint deformed bone model production method | |
| Vulovic et al. | Finite element analysis of CT based femur model using finite element program PAK |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20141224 |
|
| RJ01 | Rejection of invention patent application after publication |