CN106821552A - A kind of method for designing of customized artificial knee joint prosthesis - Google Patents
A kind of method for designing of customized artificial knee joint prosthesis Download PDFInfo
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- 210000000629 knee joint Anatomy 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 20
- 210000000689 upper leg Anatomy 0.000 claims abstract description 91
- 238000013461 design Methods 0.000 claims abstract description 16
- 238000005259 measurement Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000006467 substitution reaction Methods 0.000 abstract description 2
- 210000000988 bone and bone Anatomy 0.000 description 33
- 238000010586 diagram Methods 0.000 description 19
- 230000008569 process Effects 0.000 description 10
- 210000003127 knee Anatomy 0.000 description 9
- 230000033001 locomotion Effects 0.000 description 9
- 210000002303 tibia Anatomy 0.000 description 8
- 238000004458 analytical method Methods 0.000 description 7
- 210000004417 patella Anatomy 0.000 description 7
- 230000035772 mutation Effects 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000005021 gait Effects 0.000 description 4
- 230000002980 postoperative effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000013150 knee replacement Methods 0.000 description 2
- 210000003041 ligament Anatomy 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000035790 physiological processes and functions Effects 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 241000195622 Astasia Species 0.000 description 1
- 206010065687 Bone loss Diseases 0.000 description 1
- 206010010947 Coordination abnormal Diseases 0.000 description 1
- 101150004367 Il4i1 gene Proteins 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 241000469816 Varus Species 0.000 description 1
- 238000011882 arthroplasty Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 210000004439 collateral ligament Anatomy 0.000 description 1
- 230000002153 concerted effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000002082 fibula Anatomy 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007659 motor function Effects 0.000 description 1
- 230000035479 physiological effects, processes and functions Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/38—Joints for elbows or knees
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computed tomography [CT]
- A61B6/032—Transmission computed tomography [CT]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/50—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
- A61B6/5211—Devices using data or image processing specially adapted for radiation diagnosis involving processing of medical diagnostic data
- A61B6/5217—Devices using data or image processing specially adapted for radiation diagnosis involving processing of medical diagnostic data extracting a diagnostic or physiological parameter from medical diagnostic data
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- Veterinary Medicine (AREA)
- Public Health (AREA)
- General Health & Medical Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Heart & Thoracic Surgery (AREA)
- High Energy & Nuclear Physics (AREA)
- Pathology (AREA)
- Radiology & Medical Imaging (AREA)
- Optics & Photonics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Biophysics (AREA)
- Physics & Mathematics (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Physiology (AREA)
- Pulmonology (AREA)
- Theoretical Computer Science (AREA)
- Physical Education & Sports Medicine (AREA)
- Cardiology (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Transplantation (AREA)
- Vascular Medicine (AREA)
- Dentistry (AREA)
- Prostheses (AREA)
Abstract
The present invention relates to area of medical devices, for the design of artificial knee joint operating substitution part, specially a kind of design of customized artificial knee joint prosthesis.Solve that the femur sagittal plane condyle curvature of curve that current knee-joint prosthesis are present is discontinuous, the technical problem that rollback ability is weak, stability is poor.A kind of method for designing of customized artificial knee joint prosthesis, comprises the following steps：（1）, fit by patient femur end CT images the first sagittal plane fitted ellipse of the condyle of femur two respectively；（2）, obtain by patient femur end CT images the coronal-plane fitted ellipse of the condyle of femur two；（3）, obtain according to the size of the coronal-plane fitted ellipse semi-minor axis of the condyle of femur two second sagittal plane fitted ellipse of the condyle of femur two, wherein L is equal to the length of coronal-plane fitted ellipse semi-minor axis；（4）The coronal-plane fitted ellipse of the condyle of femur two is scanned to form smooth condyle of femur curved surface along its corresponding second sagittal plane fitted ellipse, and then constitutes two condyle structures of femur end.
Description
Technical field
It is specially a kind of customized for the design of artificial knee joint operating substitution part the present invention relates to area of medical devices
Change the design of artificial knee joint prosthesis.
Background technology
The product of existing artificial knee joint prosthesis（See document Knee implants-Review of models and
Biomechanics, Materials and Design 30 (2009) 398-413, Fig.3）, use multiple tangent group of circles
Femur sagittal plane condyle curve is fitted into curve group；Use Circular curve fitting femur coronal-plane both sides condyle curved surface.Due to for many years,
The limitation of process technology, the knee-joint prosthesis being nowadays molded have is easy to processing and manufacturing, and improvement variable is few, improves and easily wait special
Point.But with the progress of manufacturing technology（3D printing and multi-shaft interlocked lathe）, the improvement of people's living standards, patient is for knee pass
The expectation of the postoperative functional rehabilitation of section displacement technique is also gradually stepped up.Therefore, how to improve existing kneed mechanical property, be allowed to
Can preferably simulate and reproduce the kneed motor function of normal human becomes particularly important.Knee-joint prosthesis component includes：Stock
Bone component, shin bone pad, tibial component（Fig. 1）.There are problems in existing knee-joint prosthesis：1. curvature discontinuous problem, existing
There are knee-joint prosthesis due to using the tangent fitting femur sagittal plane condyle curve of multiple circles（See Application of a novel
Design method for knee replacements to achieve normal mechanics, The Knee 21
(2014) 353-358, Fig.1 and Design optimization of a total knee replacement for
Improced constraint and flexion kinematics, Journal of Biomechanics 44 (2011)
1014-1020, Fig1）, so there is the point of curvature mutation in condyle curved surface.According to Hertzian contact theory, curvature mutation can cause to connect
Touch pressure is mutated.Therefore, during gait, patient's gait power is added to the mutation power of articular prosthesis to be caused to suffer from existing prosthese
Person's joint pressure is excessive.2. rollback（rolling back）The weak problem of ability, it can be seen from human body knee joint anatomical structure, human body
During by flexing to the gait for stretching, femoral joint has a motion bit for rollback backward to knee joint on tibial plateau
Move.Most of power is provided for this displacement is front and rear ligamentaum cruciatum system, by the fixed system that ligament and kneecap are constituted, limit
The anterior displacement of stranding bone.But on existing knee-joint prosthesis, because most replacement knee in arthroplasty are needed the intersection of patient
Ligament is removed, and many basic structures being placed in parallel using interior outside condyle of femur on existing knee-joint prosthesis, closes artificial knee
The contact line of force of the section prosthese with tibial plateau during by flexing to stretching, extension is basically unchanged.From mechanical analysis, in knee
Optional position during joint motions, on horizontal plane, restraint and femur end and rubbing that shin bone is padded that kneecap part provides
Wipe dynamic balance.So, the distance between two contact points of the condyle of femur two and tibial plateau are bigger, and the restraint of kneecap part is got over
It is small.Constant distance between the contact point of existing knee-joint prosthesis, the compressing to kneecap part in motion process is larger, rollback energy
Power is limited.3. stability is poor, problem ibid, because the distance between two contact points of knee-joint prosthesis are constant, and relatively
It is nearer in the gravity line of force（See Fig. 2, Fig. 3, s1, s2, s3 respectively represent a circular arc in wherein Fig. 3, represent that existing knee-joint prosthesis are
It is fitted what is constituted by multiple circular curves are tangent）, the stability of offer is limited under midstance.4. suitability is not high, existing product
Product are generally universal models, will not do special optimization to particular patient.And trickle mismatch can also form stress-shielding effect, make
Into patient's bone-loss, cause prosthetic loosening in postoperative middle or short term, second operation reparation need to be carried out.
The content of the invention
The present invention is for the femur sagittal plane condyle curvature of curve of the current knee-joint prosthesis presence of solution is discontinuous, rollback ability
A kind of technical problem that weak, stability is poor and suitability is not high, there is provided method for designing of customized artificial knee joint prosthesis.
The present invention is realized using following technical scheme：A kind of method for designing of customized artificial knee joint prosthesis, bag
Include following steps：（1）, by the sagittal plane size of the condyle of patient femur end CT image measurement patient femurs end two, Ran Hougen
Fit the first sagittal plane fitted ellipse of the condyle of femur two respectively according to above-mentioned sized data；（2）, by patient femur end CT scheme
As the condyle coronal-plane size of measurement patient femur's terminal horizontal face two obtains the coronal-plane fitted ellipse of the condyle of femur two, while completing two
The measurement of condyle spacing dimension；（3）, according to the size of the coronal-plane fitted ellipse semi-minor axis of the condyle of femur two, will be with each coronal-plane
The corresponding first sagittal plane fitted ellipse of fitted ellipse reduces L, obtains the second sagittal plane fitted ellipse of the condyle of femur two, wherein L
Equal to the length of coronal-plane fitted ellipse semi-minor axis；（4）The height difference of the front and back ends of the sagittal plane according to the condyle of femur end two
The height of the corresponding front and back ends of condyle of femur two is determined in the second sagittal plane fitted ellipse of the condyle of femur two, then by femur
The coronal-plane fitted ellipse of two condyles scans to form smooth condyle of femur curved surface along its corresponding second sagittal plane fitted ellipse, and then structure
Into two condyle structures of femur end；Scan is carried out by the rear end forward end of the sagittal plane fitted ellipse of the condyle of femur two, when scanning
The central point that two sagittal plane fitted ellipses pass through corresponding coronal-plane fitted ellipse, while path, the condyle of femur two are scanned in edge
Coronal-plane fitted ellipse by original horizontal position distinguish Linear Rotation α angles and β angles, the coronal-plane of the condyle of femur two in rotary course
Tangent line vector of the fitted ellipse with each self-corresponding second sagittal plane fitted ellipse as rotary shaft, coronal-plane fitted ellipse it is outer
Side is rotated down；α, β angle is by bent to contrasting the condyle coronal-plane front-end and back-end of femur two in patient femur end CT measurements
Face difference is obtained；（5）, complete femoral prosthesis other parts structure design.
Technical solutions according to the invention solve following technical problem：
1st, continual curvature problem：With the sagittal plane border curve of ellipse simulation femur distal femoral condyle, make the condyle of femur end two
Sagittal face curvature press elliptic curve consecutive variations so that eliminate due to articular prosthesis surface curvature mutation caused by rotation process
In stress mutation.
2nd, rollback problem：It is same to be fitted the condyle coronal-plane of femur two using elliptic curve, and will be ellipse along sagittal plane all angles
Circle does certain rule and rotates to form smooth condyle of femur curved surface.In this way, the contact trace that condyle of femur is padded with shin bone is by tradition
Plane curve, be changed into both sides reverse space curve.Make knee joint in by the motion process for bending to stretching, extension femur with
The contact point of shin bone pad is gradually to two side shiftings（Before Fig. 4 solid lines are to improve, after dotted line is to improve）.Analyzed from coronal-plane,
Have two condyles and shin bone suffered by kneecap pad making a concerted effort for frictional force, due to the change of the line of force, reduce.That is, kneecap energy
Restraint is effectively provided during motion of knee joint, it is ensured that rollback displacement of the femur in motion process.
3rd, stability：In upper identical motion process, analyzed on coronal-plane, because the condyle of femur two and shin bone pad it
Between contact point to two side shiftings（L2 length is more than l1 in Fig. 2 in Fig. 5）, two line of force angles with gravitational equilibrium gradually increase
Greatly, kneed stability is made to get a promotion.
4th, suitability aspect：In design process, paying close attention to several places can reflect the letter of patient articular's specificity geometric properties
Breath（Two intercondylar be fitted two condyle shapes ellipse size, rotated along the condyle of sagittal plane direction two away from, condyle wire clamp angle, sagittal plane and coronal-plane
Angle）.The knee-joint prosthesis designed using 3 d modeling software can enter Mobile state to be changed, according to the physiology that different patient CT are extracted
Prosthese data are modified by information.So as to design with certain personalized knee-joint prosthesis, improve the postoperative knee of patient and close
Section performance.
5th, by finite element software and gait analysis method, the data gathered according to reverse engineering software draw patient's knee pass
Save the key messages such as basic condyle line position, ellipse fitting ectocondyle surface and generate prosthese model.Carried out for design prosthese model
Mechanics and kinematics analysis, optimize to result, make its reproduction normal human's knee joint physiological function.
Beneficial effects of the present invention：
1st, femur end prosthesis assembly uses ellipse fitting joint curved surface（Figure 11）, curvature of curved surface consecutive variations.Make articulation
During contact force do not produce compared with macromutation.
2nd, femoral prosthesis inter_curve is changed into interior condyle varus, the space curve that ectocondyle turns up by original plane curve.From
And, distance increases between making the contact point of horizontal plane upper joint motion, strengthens femur end rollback ability.Improve femur mechanical ring
Border, meets human physilogical characteristic.
3rd, the mechanics situation of coronal-plane is improved, and is joint contact curve, femoral joint face by above-mentioned space curve
The contact point padded with shin bone increased the stability of femur to two side shiftings.Avoid because femur is vacillated now to the left, now to the right, astasia
Caused by interior lateral collateral ligament damage.
4th, this prosthetic designs, are limited customized prosthetic designs.Avoid customized complicated technology completely and higher
Cost, while remaining the advantage that customized femoral prosthesis is changed for the situation of different patients.In control cost and work
On the basis of skill difficulty, the special physiological feature of different patients is taken into account, measure patient's knee joint key position geometrical characteristic parameter
（Two is intercondylar away from, condyle wire clamp angle（The angle of plane where inside and outside two condyles sagittal plane fitted ellipse）, sagittal plane and coronal-plane fitting two
Condyle shape ellipse size, along the condyle anglec of rotation of sagittal plane direction two（I.e. each coronal-plane fitted ellipse scans the front and rear anglec of rotation
Degree, that is, α angles and β angles）.The knee-joint prosthesis generated by these key parameters, can preferably reappear patient's nature knee
The physiological function and movement characteristic in joint.
Brief description of the drawings
Fig. 1 knee-joint prosthesis modular construction schematic diagrames.
1- distal femoral components, 2- polyethylene liners, 3- tibial components, 4- kneecaps, 5- fibulas；
11- femurs, 31- shin bones.
The existing knee-joint prosthesis stance force analysis schematic diagrames of Fig. 2（Front）.
The existing knee-joint prosthesis stance force analysis schematic diagrames of Fig. 3（Side）.
The knee joint stance force analysis contrast schematic diagram that Fig. 4 prior arts are obtained with present invention design, solid line is in figure
Prior art, dotted line is the present invention.
The knee-joint prosthesis stance force analysis schematic diagram of Fig. 5 present invention designs.
Fig. 6 is one of dimensional structure diagram of distal femoral component.
Fig. 7 is the two of the dimensional structure diagram of distal femoral component.
Fig. 8 is the three of the dimensional structure diagram of distal femoral component.
Fig. 9 is the four of the dimensional structure diagram of distal femoral component.
Figure 10 be by the CT pictures in patient femur joint, and with MIMICS softwares measure sagittal plane condyle of femur line chi
It is very little, and then obtain the schematic diagram of the sagittal plane fitted ellipse of condyle bone.
Figure 11 is applied to the schematic diagram of 3 d geometric modeling for the sagittal plane fitted ellipse of condyle bone.
Figure 12 is applied to schematic diagram during 3 d geometric modeling for the coronal-plane fitted ellipse of condyle bone.
Figure 13 is three-dimensional modeling schematic diagram when scanning beginning.
Figure 14 is the process schematic that condyle bone coronal-plane fitted ellipse is scanned along the sagittal plane fitted ellipse of condyle bone.
Specific embodiment
A kind of method for designing of customized artificial knee joint prosthesis, comprises the following steps：（1）, by patient femur end
The sagittal plane size of the condyle of CT image measurement patient femurs end two, then fits the condyle of femur two respectively according to above-mentioned sized data
The first sagittal plane fitted ellipse；（2）, it is coronal by two condyles of patient femur end CT image measurement patient femur's terminal horizontals face
Face size obtains the coronal-plane fitted ellipse of the condyle of femur two, while completing the measurement of two condyle spacing dimensions；（3）, according to femur two
The size of the coronal-plane fitted ellipse semi-minor axis of condyle, will the first sagittal plane fitted ellipse corresponding with each coronal-plane fitted ellipse
L is reduced, the second sagittal plane fitted ellipse of the condyle of femur two is obtained, wherein L is equal to the length of coronal-plane fitted ellipse semi-minor axis；
（4）The height of the front and back ends of the sagittal plane according to the condyle of femur end two is respectively in the second sagittal plane fitted ellipse of the condyle of femur two
On determine the height of the corresponding front and back ends of condyle of femur two, it is then that the coronal-plane fitted ellipse of the condyle of femur two is corresponding along its
Second sagittal plane fitted ellipse scans to form smooth condyle of femur curved surface, and then constitutes two condyle structures of femur end；Scan by stock
The rear end forward end of the sagittal plane fitted ellipse of the condyle of bone two is carried out, and the second sagittal plane fitted ellipse is by corresponding when scanning
The central point of coronal-plane fitted ellipse, while along path is scanned, the coronal-plane fitted ellipse of the condyle of femur two is by original horizontal position
Difference Linear Rotation α angles and β angles, the coronal-plane fitted ellipse of the condyle of femur two is with each self-corresponding second sagittal in rotary course
The tangent line vector of face fitted ellipse is rotary shaft, and the outside of coronal-plane fitted ellipse is rotated down；α, β angle is by patient
The condyle coronal-plane front-end and back-end curved surface difference of femur two is contrasted in femur end CT measurements to obtain；（5）, complete femoral prosthesis other
Partial structure design.
If Fig. 6,7,8,9 are the dimensional structure diagram of distal femoral component；When distal femoral component is stood according to human body in figure just
Normal attitude is placed, and the geometric center for choosing distal femoral component is origin, using the horizontal direction of the front end along condyle bone to rear end as Y
Axle, used as X-axis, the direction of vertical X axis and Y-axis formed plane sets up one on distal femoral component to the two condyle bone lines of centres as Z axis
Three-dimensional system of coordinate；It is illustrated in figure 7 the side view of distal femoral component（Sagittal plane）, Fig. 8 sees by the rear end forward end of distal femoral component
Examine, Fig. 9 is observed from top to bottom.Figure 10 be by the CT pictures in patient femur joint, and with MIMICS softwares measure sagittal plane stock
The size of bone condyle line, and then obtain the first sagittal plane fitted ellipse of condyle bone（See oval in figure）Schematic diagram；Figure 11 is condyle bone
Sagittal plane fitted ellipse be applied to the schematic diagram of 3 d geometric modeling, the figure is observed along the Y direction of three-dimensional system of coordinate, in figure
The second resulting after being reduced for the first sagittal plane fitted ellipse of the condyle bone for obtaining before sagittal plane fitted ellipse of ellipse（According to
The semi-minor axis length reduction of coronal-plane fitted ellipse）；Figure 12 is for when the coronal-plane fitted ellipse of condyle bone is applied to three-dimensional modeling
Schematic diagram, the figure is observed along the Z-direction of condyle bone three-dimensional system of coordinate（Observe from top to bottom, but turned one about the z axis compared to Fig. 9
Individual angle）, the ellipse in figure is the coronal-plane fitted ellipse of the condyle bone obtained by CT picture of patient, and the ellipse in figure is located at
Condyle bone rear end, that is, initial position of condyle bone coronal-plane fitted ellipse when scanning；Figure 13 is three-dimensional modeling when scanning beginning
Schematic diagram, now condyle bone coronal-plane fitted ellipse（Small ellipse）Positioned at a back-end location for condyle bone, and start to sweep in this position
Plunder, the short axle of coronal-plane fitted ellipse passes through the second sagittal plane fitted ellipse；Figure 14 is condyle bone coronal-plane fitted ellipse along condyle bone
The process schematic that is scanned of sagittal plane fitted ellipse, it is multiple small oval for condyle bone coronal-plane fitted ellipse is being swept in figure
The schematic diagram of middle diverse location is plunderred, condyle bone coronal-plane fitted ellipse is sweeping road with the second sagittal plane fitted ellipse in sweep process
The tangent line vector in footpath be axial rotary outside rotation, as shown in the condyle bone coronal-plane fitted ellipse lateral ends（I.e. not
One end neighbouring with another condyle bone）Rotate gradually downward, until condyle bone coronal-plane fitted ellipse is ellipse along the fitting of condyle bone coronal-plane
Circular sweep completes to scan to condyle bone front end, and condyle bone coronal-plane fitted ellipse major axis and the major axis before scanning now are in α angles or β
Angle, it is also possible to regard that condyle bone coronal-plane fitted ellipse major axis have rotated α angles or β angles as.It is right during α angles or β angles are measured by patient CT
Obtained than femur coronal-plane front-end and back-end curved surface difference.The rotation of condyle bone coronal-plane fitted ellipse is linear in sweep process
, i.e., according to the linear Rotating with Uniform of the distance scanned.
First sagittal plane fitted ellipse reduces L, refers to that the major axis and short axle of the first sagittal plane fitted ellipse reduce L（Hat
The semi-minor axis length of shape face fitted ellipse）, the second sagittal plane fitted ellipse is obtained, while the center of the second sagittal plane fitted ellipse
With the center superposition of the first sagittal plane fitted ellipse.The tangent line vector of the second sagittal plane fitted ellipse was the fitting of the second sagittal plane
The tangent line that the oval central intersection point with coronal-plane fitted ellipse is done, the tangent line is located at where the second sagittal plane fitted ellipse
In plane.
Having many softwares when 3 d geometric modeling can use, such as UG or Solidworks etc..
Claims (2)
1. a kind of method for designing of customized artificial knee joint prosthesis, it is characterised in that comprise the following steps：（1）, by patient
The sagittal plane size of the condyle of femur end CT image measurement patient femurs end two, then fits respectively according to above-mentioned sized data
First sagittal plane fitted ellipse of the condyle of femur two；（2）, by patient femur end CT image measurement patient femur's terminal horizontals face
Two condyle coronal-plane sizes obtain the coronal-plane fitted ellipse of the condyle of femur two, while completing the measurement of two condyle spacing dimensions；（3）, root
According to the size of the coronal-plane fitted ellipse semi-minor axis of the condyle of femur two, will the first sagittal plane corresponding with each coronal-plane fitted ellipse
Fitted ellipse reduces L, obtains the second sagittal plane fitted ellipse of the condyle of femur two, and wherein L is equal to coronal-plane fitted ellipse semi-minor axis
Length；（4）The height of the front and back ends of the sagittal plane according to the condyle of femur end two is intended in the second sagittal plane of the condyle of femur two respectively
The height that the corresponding front and back ends of condyle of femur two are determined on ellipse is closed, then by the coronal-plane fitted ellipse of the condyle of femur two along it
Corresponding second sagittal plane fitted ellipse scans to form smooth condyle of femur curved surface, and then constitutes two condyle structures of femoral prosthesis；Sweep
Plunder is carried out by the rear end forward end of the sagittal plane fitted ellipse of the condyle of femur two, when scanning the second sagittal plane fitted ellipse by with its
The central point of corresponding coronal-plane fitted ellipse, while along path is scanned, the coronal-plane fitted ellipse of the condyle of femur two is by initial water
Prosposition puts Linear Rotation α angles and β angles respectively, and the coronal-plane fitted ellipse of the condyle of femur two is with each self-corresponding the in rotary course
The tangent line vector of two sagittal plane fitted ellipses is rotary shaft, and the outside of coronal-plane fitted ellipse is rotated down；α, β angle by
The condyle coronal-plane front-end and back-end curved surface difference of femur two is contrasted in measuring patient femur end CT to obtain；（5）, to complete femur false
The structure design of body other parts.
2. a kind of method for designing of customized artificial knee joint prosthesis as claimed in claim 1, it is characterised in that the α angles,
Major axis before β angles are scanned by coronal-plane fitted ellipse is expressed with the major axis angle after scanning.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107280815A (en) * | 2017-08-01 | 2017-10-24 | 北京安颂科技有限公司 | Lateral femoral condyle prosthesis and artificial knee joint |
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