CN110443005A - A kind of complete knee joint finite element modeling method - Google Patents
A kind of complete knee joint finite element modeling method Download PDFInfo
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- CN110443005A CN110443005A CN201910780245.3A CN201910780245A CN110443005A CN 110443005 A CN110443005 A CN 110443005A CN 201910780245 A CN201910780245 A CN 201910780245A CN 110443005 A CN110443005 A CN 110443005A
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
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- G—PHYSICS
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T19/00—Manipulating 3D models or images for computer graphics
- G06T19/20—Editing of 3D images, e.g. changing shapes or colours, aligning objects or positioning parts
Abstract
The present invention provides a kind of complete knee joint finite element modeling methods, belong to joint modeling technique field, comprising: acquisition knee joint data；Open data file and determine coronal-plane, cross section, sagittal plane image；The bone tissue of needs is divided in sagittal plane or coronal-plane；Obtain the three-dimensional stereo model of bone tissue；Obtain the three-dimensional stereo model of soft tissue；The three-dimensional stereo model of the three-dimensional stereo model of bone tissue and soft tissue is registrated, complete knee joint model is obtained；Delete structural plane mixed and disorderly in complete knee joint model；Knee joint is carried out to simplify tri patch, removal spike, reparation, relaxation, parametric surface, precise curved surface operation respectively, finally saves into IGS file, the three-dimensional finite element model for completing complete knee joint is established.This method modeling efficiency is high, can solve the extraction problem to knee joint model, is analyzed by numerical simulation kneed stress behavior, is conducive to knee joint protection, rehabilitation and prosthetic designs and optimization.
Description
Technical field
The invention belongs to joint modeling technique fields, and in particular to a kind of complete knee joint finite element modeling method.
Background technique
Knee joint is by shin bone, kneecap, the bone tissues such as femur and meniscus, ligament, the soft tissues such as cartilage composition.Its structure is multiple
Miscellaneous, motor function is comprehensive, but is also sick and wounded multiple position, is common in industrial production, traffic accident and injury gained in sports.Over-65s
Crowd in, 90% women and 80% male suffer from bone disease.Currently, have in the kneed micromechanism of damage of research very big again
Limitation, the method mainly used have experiment and numerical simulation.But it is costly, differ greatly in vitro in body situation, condition is difficult
With control, it is difficult to obtain the stress distribution of bone tissue and cartilaginous tissue, the source rareness of corpse complete knee joint limits in vitro reality
It tests, the present invention intends that two-dimensional image data is being converted into three-dimensional data using medical image three-dimensional reconfiguration technique, to show people
The kneed three-dimensional configuration of body simultaneously carries out quantitative analysis.
Summary of the invention
In order to overcome the shortcomings of the prior art described above, the present invention provides a kind of complete knee joint finite element modeling sides
Method.
To achieve the goals above, the invention provides the following technical scheme:
A kind of complete knee joint finite element modeling method, comprising the following steps:
Step 1, acquisition knee joint data；
Collected data file is imported Mimics software and opened by step 2, then defines direction, and determine respectively
Coronal-plane, cross section, sagittal plane image；
Step 3, using the Profile Line tool in Mimics software in sagittal plane or coronal-plane by the bone of needs
Matter tissue is divided, and interface to be popped up can show an interval value；
Step 4 is extracted editor according to the interval value that step 3 is set using the threshold value setting means of Mimics software, and is led to
The geometry illiteracy cover that region tool for increasing generates shin bone, femur, kneecap, fibula is crossed, the two dimensional image of bone tissue is obtained, then makes
The two dimensional image of the bone tissue is converted into three-dimensional stereo model with Calculate 3D order, to obtain bone tissue
Three-dimensional stereo model；
Step 5 imports Mimics software after exporting the MRI scan result of healthy human body with DICOM file format, utilizes
3D Magnetic Lasso Tool sketches the contours of anterior cruciate ligament, posterior cruciate ligament of knee, interior lateral collateral ligament and each soft tissue of meniscus respectively
Then profile is edited by dynamic area tool for increasing, to generate the three-dimensional stereo model of soft tissue；
The three-dimensional stereo model and step 5 for the bone tissue that step 6, continuation obtain step 4 in Mimics obtain
To the three-dimensional stereo model of the soft tissue be registrated, method is that all stl files are imported the same Mimics is soft
In part, complete complete knee joint model can be obtained, and store and export at STL format；
Step 7 imports the complete complete knee joint model in Rhinoceros, blows grid with order is blown, deletes
Except mixed and disorderly structural plane, then file is stored into stl file；
Step 8, the stl file for obtaining step 7 import in Geomagic Studio software, distinguish knee joint
It carries out simplifying tri patch, removal spike, reparation, relaxation, parametric surface, precise curved surface operation, finally saves into IGS text
Part；
Step 9, the IGS file for obtaining step 7 import in Abaqus, and face, the definition material, division of contact is arranged
Grid, the three-dimensional finite element model for completing complete knee joint are established.
Preferably, healthy human body knee joint is scanned by CT in the step 1, obtains knee joint data；
Preferably, CT scan result is used in the step 2 with importing Mimics software after the output of DICOM file format
DICOM file is opened in New Project Wizard order.
Preferably, the step 4 is generating the geometry illiteracy cover region the Shi Yaoyong tool for increasing progress hot-zone selection, if
The structure that need to be rebuild is close with surrounding tissue gray value, and when extraction then needs the method using manual identified, will to every tomographic image
Carry out edge segmentation, removal redundant data, selective editing and filling-up hole processing.
Preferably, the step 4 carries out smooth treatment after the three-dimensional stereo model for obtaining the bone tissue.
Preferably, the step 5 by dynamic area tool for increasing after being edited, with in-edit tool to each
Slice picture is modified.
Complete knee joint finite element modeling method structure provided by the invention simply has the advantages that
1) this method can be established by using a series of softwares such as Mimics software and Geomagic Studio software
Model is imported in finite element software Abaqus the biomethanics variation for simulating it by kneed model out；
2) by can quickly delete some unnecessary faces, modify the control point of curved surface after Rhinoceros software,
Surface reconstruction keeps curved surface more smooth and has continuity；
3) some holes of model can be repaired by reverse engineering software Geomagic Studio, it is again smart
Trueization curved surface, fitting surface reach the input format IGS of finite element analysis software；
4) modeling efficiency is high, can solve the extraction problem to knee joint model, by numerical simulation to kneed stress
Behavior is analyzed, to knee joint protection, rehabilitation and prosthetic designs and optimization, consequently facilitating reaction knee joint is in physiological loads
Mechanical behavior under effect, all has directive significance to the rehabilitation scheme of osteoarthritis patient, can reach better prevention,
The effect of diagnoses and treatment improves people and kneed consciousness, reduction joint injury and biological instrument is protected to have important meaning
Justice.
Detailed description of the invention
Fig. 1 is the flow chart of the complete knee joint finite element modeling method of the embodiment of the present invention 1；
Fig. 2 is the complete knee joint main view that the complete knee joint finite element modeling method of the embodiment of the present invention 1 obtains；
Fig. 3 is the complete knee joint rearview that the complete knee joint finite element modeling method of the embodiment of the present invention 1 obtains.
Specific embodiment
With reference to the accompanying drawing, further description of the specific embodiments of the present invention.Following embodiment is only used for more
Technical solution of the present invention is clearly demonstrated, and not intended to limit the protection scope of the present invention.
Embodiment 1
It is specific as shown in Figure 1 the present invention provides a kind of complete knee joint finite element modeling method, comprising the following steps:
Step 1, acquisition knee joint data；Specifically, in the step 1 of the present embodiment by CT to healthy human body knee joint into
Row scanning, obtains knee joint data；
Collected data file is imported Mimics software and opened by step 2, then defines direction, and determine respectively
Coronal-plane, cross section, sagittal plane image；Specifically, CT scan result is in the step 2 of the present embodiment with DICOM file format
Mimics software is imported after output, opens DICOM file using New Project Wizard order；
Step 3, using the Profile Line tool in Mimics software in sagittal plane or coronal-plane by the bone of needs
Matter tissue is divided, and interface to be popped up can show an interval value；
Step 4 is extracted editor according to the interval value that step 3 is set using the threshold value setting means of Mimics software, and is led to
The geometry illiteracy cover that region tool for increasing generates shin bone, femur, kneecap, fibula is crossed, the two dimensional image of bone tissue is obtained, then makes
The two dimensional image of bone tissue is converted into three-dimensional stereo model with Calculate 3D order, to obtain the three of bone tissue
Tie up three-dimensional model；
It should be noted that step 4 is generating the geometry illiteracy cover region Shi Yaoyong tool for increasing progress hot-zone selection, if needed
The structure of reconstruction is close with surrounding tissue gray value, and when extraction then needs the method using manual identified, will be into every tomographic image
The segmentation of row edge, removal redundant data, selective editing and filling-up hole processing, while in the three-dimensional stereo model for obtaining bone tissue
After carry out smooth treatment；
Step 5 imports Mimics software after exporting the MRI scan result of healthy human body with DICOM file format, utilizes
3D Magnetic Lasso Tool sketches the contours of anterior cruciate ligament, posterior cruciate ligament of knee, interior lateral collateral ligament and each soft tissue of meniscus respectively
Then profile is edited by dynamic area tool for increasing, to generate the three-dimensional stereo model of soft tissue；
Step 6, continuation obtain the three-dimensional stereo model for the bone tissue that step 4 obtains and step 5 in Mimics
The three-dimensional stereo model of soft tissue is registrated, and method is to import all stl files in the same Mimics software, energy
Complete complete knee joint model is obtained, and stores and is exported at STL format；
In order to ensure the accuracy of model, step 5 by dynamic area tool for increasing after being edited, with in-edit work
Tool modifies each slice picture, the present embodiment specifically used " edit in mask " and " edit mask in3D " life
Order is modified；
Step 7 imports complete complete knee joint model in Rhinoceros, blows grid with order is blown, deletes miscellaneous
Then random structural plane stores file at stl file；After Rhinoceros software, can quickly delete it is some not
Necessary face, modifies the control point of curved surface, and surface reconstruction keeps curved surface more smooth and has continuity；
Step 8, the stl file for obtaining step 7 import in Geomagic Studio software, carry out respectively to knee joint
Simplify tri patch, removal spike, reparation, relaxation, parametric surface, precise curved surface operation, finally saves into IGS file；
Step 9, the IGS file for obtaining step 7 import in Abaqus, and the face of contact is arranged, definition material, divides net
Lattice, the three-dimensional finite element model for completing complete knee joint are established.
The sclerotin and soft tissue for needing to extract due to complete knee joint are complex, can only extract in mimics software very thick
The tri patch that form slightly, especially software automatically generate is disorderly and unsystematic.Fig. 2 is that the complete knee joint of the embodiment of the present invention 1 has
The complete knee joint main view that limit Meta Model method obtains, Fig. 3 is that the complete knee joint finite element modeling method of the embodiment of the present invention 1 obtains
The complete knee joint rearview arrived.By Fig. 2 and Fig. 3 it is found that by this method, can be very good to carry out surface reconstruction, removal nail
Shape object makes curved surface more have continuity, and accuracy is higher, and fitting surface is more convenient, reaches the requirement of finite element analysis.
Embodiment described above is merely preferred embodiments of the present invention, and the scope of protection of the present invention is not limited to this,
Anyone skilled in the art within the technical scope of the present disclosure, the technical solution that can be become apparent to
Simple change or equivalence replacement, all belong to the scope of protection of the present invention.
Claims (6)
1. a kind of complete knee joint finite element modeling method, which comprises the following steps:
Step 1, acquisition knee joint data；
Collected data file is imported Mimics software and opened by step 2, then defines direction, and determine respectively coronal
Face, cross section, sagittal plane image；
Step 3, using the Profile Line tool in Mimics software in sagittal plane or coronal-plane by the sclerotin group of needs
It knits and is divided, one interval value of interface display to be popped up；
Step 4 extracts editor according to the interval value that step 3 is set using the threshold value setting means of Mimics software, and passes through area
Domain tool for increasing generates the geometry illiteracy cover of shin bone, femur, kneecap, fibula, obtains the two dimensional image of bone tissue, then uses
The two dimensional image of the bone tissue is converted into three-dimensional stereo model by Calculate 3D order, to obtain bone tissue
Three-dimensional stereo model；
Step 5 imports Mimics software after exporting the MRI scan result of healthy human body with DICOM file format, sketches the contours respectively
Then the profile of anterior cruciate ligament, posterior cruciate ligament of knee, interior lateral collateral ligament and each soft tissue of meniscus out is increased by dynamic area
Long tool is edited, to generate the three-dimensional stereo model of soft tissue；
Step 6, continuation obtain the three-dimensional stereo model for the bone tissue that step 4 obtains and step 5 in Mimics
The three-dimensional stereo model of the soft tissue is registrated, and complete complete knee joint model is obtained；
Step 7 imports the complete complete knee joint model in Rhinoceros, blows grid with order is blown, deletes miscellaneous
Then random structural plane stores file at stl file；
Step 8, the stl file for obtaining step 7 import in Geomagic Studio software, carry out respectively to knee joint
Simplify tri patch, removal spike, reparation, relaxation, parametric surface, precise curved surface operation, finally saves into IGS file；
Step 9, the IGS file for obtaining step 7 import in Abaqus, and the face of contact is arranged, definition material, divides net
Lattice, the three-dimensional finite element model for completing complete knee joint are established.
2. complete knee joint finite element modeling method according to claim 1, which is characterized in that pass through CT in the step 1
Healthy human body knee joint is scanned, knee joint data are obtained.
3. complete knee joint finite element modeling method according to claim 1, which is characterized in that CT scan in the step 2
As a result to import Mimics software after the output of DICOM file format, DICOM text is opened using New Project Wizard order
Part.
4. complete knee joint finite element modeling method according to claim 1, which is characterized in that the step 4 is generating institute
It states and carries out hot-zone selection with region tool for increasing when geometry covers cover, if the structure that need to be rebuild is close with surrounding tissue gray value,
The method using manual identified is then needed when extraction, and edge segmentation, removal redundant data, selectivity volume will be carried out to every tomographic image
It collects and filling-up hole is handled.
5. complete knee joint finite element modeling method according to claim 1, which is characterized in that the step 4 is obtaining
Smooth treatment is carried out after stating the three-dimensional stereo model of bone tissue.
6. complete knee joint finite element modeling method according to claim 1, which is characterized in that the step 5 is by dynamic
After state region tool for increasing is edited, each slice picture is modified with in-edit tool.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111297524A (en) * | 2020-02-12 | 2020-06-19 | 吉林大学 | Knee joint defect cushion block and manufacturing method thereof |
| CN111973270A (en) * | 2020-08-03 | 2020-11-24 | 上海交通大学 | Method for establishing individual knee joint bionic ligament biomechanical model |
| CN112733404A (en) * | 2021-01-07 | 2021-04-30 | 西北工业大学 | Method for establishing human knee joint finite element model in motion process |
| CN113033045A (en) * | 2021-03-09 | 2021-06-25 | 上海工程技术大学 | Prediction method based on knee joint elastic knee protection effect |
| CN113136646A (en) * | 2021-03-01 | 2021-07-20 | 西安理工大学 | Method for customizing protective equipment product in personalized mode |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111297524A (en) * | 2020-02-12 | 2020-06-19 | 吉林大学 | Knee joint defect cushion block and manufacturing method thereof |
| CN111297524B (en) * | 2020-02-12 | 2021-07-13 | 吉林大学 | Knee joint defect cushion block and manufacturing method thereof |
| CN111973270A (en) * | 2020-08-03 | 2020-11-24 | 上海交通大学 | Method for establishing individual knee joint bionic ligament biomechanical model |
| CN111973270B (en) * | 2020-08-03 | 2022-02-22 | 上海涛影医疗科技有限公司 | Method for establishing individual knee joint bionic ligament biomechanical model |
| CN112733404A (en) * | 2021-01-07 | 2021-04-30 | 西北工业大学 | Method for establishing human knee joint finite element model in motion process |
| CN112733404B (en) * | 2021-01-07 | 2023-04-14 | 西北工业大学 | Method for establishing human knee joint finite element model in motion process |
| CN113136646A (en) * | 2021-03-01 | 2021-07-20 | 西安理工大学 | Method for customizing protective equipment product in personalized mode |
| CN113136646B (en) * | 2021-03-01 | 2022-09-09 | 西安理工大学 | Method for customizing protective equipment product in personalized mode |
| CN113033045A (en) * | 2021-03-09 | 2021-06-25 | 上海工程技术大学 | Prediction method based on knee joint elastic knee protection effect |
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