WO1993021862A1 - Mit knochenzement zu verankernde femurprothesenkomponente und verfahren zu ihrer herstellung - Google Patents
Mit knochenzement zu verankernde femurprothesenkomponente und verfahren zu ihrer herstellung Download PDFInfo
- Publication number
- WO1993021862A1 WO1993021862A1 PCT/EP1993/001001 EP9301001W WO9321862A1 WO 1993021862 A1 WO1993021862 A1 WO 1993021862A1 EP 9301001 W EP9301001 W EP 9301001W WO 9321862 A1 WO9321862 A1 WO 9321862A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- prosthesis
- bone
- section
- cross
- femoral
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000002639 bone cement Substances 0.000 title claims abstract description 13
- 210000000988 bone and bone Anatomy 0.000 claims abstract description 40
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 230000037182 bone density Effects 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 11
- 210000000689 upper leg Anatomy 0.000 claims description 10
- 238000004873 anchoring Methods 0.000 claims description 6
- 210000004394 hip joint Anatomy 0.000 claims description 6
- 238000002513 implantation Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims 1
- 238000002591 computed tomography Methods 0.000 claims 1
- 239000010936 titanium Substances 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 8
- 238000010191 image analysis Methods 0.000 abstract description 4
- 239000007943 implant Substances 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 3
- 208000025747 Rheumatic disease Diseases 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 210000002436 femur neck Anatomy 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000000552 rheumatic effect Effects 0.000 description 2
- 238000001356 surgical procedure Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 210000001185 bone marrow Anatomy 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 210000003275 diaphysis Anatomy 0.000 description 1
- 210000002745 epiphysis Anatomy 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000003703 image analysis method Methods 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000025712 muscle attachment Effects 0.000 description 1
- 210000002346 musculoskeletal system Anatomy 0.000 description 1
- 230000000399 orthopedic effect Effects 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 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
- A61F2/3094—Designing or manufacturing processes
- A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
-
- 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
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
- A61F2/3662—Femoral shafts
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/4097—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by using design data to control NC machines, e.g. CAD/CAM
- G05B19/4099—Surface or curve machining, making 3D objects, e.g. desktop manufacturing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
- A61B34/10—Computer-aided planning, simulation or modelling of surgical operations
-
- 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
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
- A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
- A61F2002/30014—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in elasticity, stiffness or compressibility
-
- 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
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/3011—Cross-sections or two-dimensional shapes
- A61F2002/30112—Rounded shapes, e.g. with rounded corners
- A61F2002/30131—Rounded shapes, e.g. with rounded corners horseshoe- or crescent- or C-shaped or U-shaped
-
- 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
- A61F2/3094—Designing or manufacturing processes
- A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
- A61F2002/30952—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques using CAD-CAM techniques or NC-techniques
-
- 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
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2002/4631—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor the prosthesis being specially adapted for being cemented
-
- 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
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
- A61F2230/0004—Rounded shapes, e.g. with rounded corners
- A61F2230/0013—Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
-
- 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
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
- A61F2250/0018—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in elasticity, stiffness or compressibility
-
- 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
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00017—Iron- or Fe-based alloys, e.g. stainless steel
-
- 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
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys
-
- 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
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00029—Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S623/00—Prosthesis, i.e. artificial body members, parts thereof, or aids and accessories therefor
- Y10S623/901—Method of manufacturing prosthetic device
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S623/00—Prosthesis, i.e. artificial body members, parts thereof, or aids and accessories therefor
- Y10S623/912—Method or apparatus for measuring or testing prosthetic
- Y10S623/914—Bone
Definitions
- Femoral prosthesis component to be anchored with bone cement and process for its manufacture
- the invention relates to a femoral prosthesis component to be anchored with bone cement and a method for the production thereof.
- the invention is based on the object of providing a femoral prosthesis component to be anchored with bone cement, which gives good long-term results during implantation.
- each bone has an individual shape and an individual strength; Both factors must therefore be taken into account when choosing the prosthesis. It is important to take into account the shape of the bone marrow cavity because an incomplete cement sheath leads to its early destruction. Two things are important here: 1. To achieve the greatest possible primary stability of the anchoring and 2. To provide as large a surface as possible for the force transmission between the prosthesis and the bone.
- the dimensions and / or stiffness of the femoral prosthesis component according to the invention can be adjusted to the individual properties of the bone.
- the bending stiffness of the prosthesis is the decisive factor.
- tensile stresses occur in the distal as well as in the proximal area, so that the tensile strength of the prosthesis also plays a role there.
- Tensile strength is particularly important in the distal area. Because of the muscle attachments that leave the femoral neck and femoral neck free, torsional forces also occur.
- the material properties discussed above are usually summarized in the present application as "rigidity".
- the stiffness of the prosthesis and / or its mass is adapted to the individual properties of the bone.
- the adaptation can be carried out in different ways, for example the material of the prosthesis can be selected according to the individual properties of the bone. In the case of a dense bone, a material with a higher specific mass and higher stiffness can be selected, whereas a material with a lower specific mass and stiffness is selected accordingly for a bone with low density.
- CoCrMo alloys, Ti, Ti alloys, steel, plastic or composite materials, for example, can be used as prosthesis material.
- the material for the prosthetic component inhomogeneous, in the sense that a material with a higher specific mass and / or stiffness is used in areas with higher bone density than in areas with lower bone density. It must be taken into account here that the bone density can vary very greatly and in the cancellous area can only be 15 to 20% of the density of the compact bone.
- the desired inhomogeneity of the material can be produced, for example, by varying the pore size when using a porous material and setting it smaller in the region of higher bone density.
- Composite materials can also be used as material for the prosthesis component, the fiber content of the composite material, for example, being able to vary over the length of the prosthesis component. In this way, the rigidity of the prosthesis component in particular can be varied and adapted to the bone density.
- the adaptation of the mass and / or stiffness of the prosthesis component to the individual properties of the bone can also be carried out by a suitable choice of the shape of the prosthesis component, in particular the cross section of the prosthesis component in different bone sections.
- the cross-section of the femoral prosthesis component is U-shaped or horseshoe-shaped over at least a substantial part of its length, as proposed in WO 90/02533
- the cross-sectional area and thus the prosthesis can be cut in different sectional planes by suitable choice of the size and depth of the channel or of the slot between the two arms of the U-shaped cross section can be adjusted.
- a transition from a full shaft to a U-shaped cross section with very thin arms is conceivable.
- the largest possible surface for the power transmission is ensured by the fact that the prosthesis component forms a closed surface in the media, dorsomedial and anteroedial area.
- Changes in mass and / or rigidity can also be achieved, for example, by making partially through bores, such as blind bores, or completely through bores in the prosthesis socket, in particular in order to reduce the mass and / or rigidity.
- applied strips and / or reinforcements on the outer and / or inner contour of the prosthesis for example a U-shaped prosthesis socket, the mass and / or increase the stiffness of the prosthetic component. This can be carried out either in sections or continuously over the entire length of the prosthesis component.
- the adaptation of the mass and / or stiffness of the prosthesis component to the bone density is preferably carried out by providing a linear correlation between the bone density and the mass or stiffness of the prosthesis component, i.e. that, for example, when the bone density is doubled, the mass or stiffness of the prosthesis in the corresponding area of the prosthesis component is increased as a percentage.
- a patient with a deformed and arthrotically modified hip joint is examined in a computed tomograph, and stacked images of both hip joints are digitized and saved as cross-sectional images.
- So-called binary images are generated from the cross-sectional images using image analysis methods, i.e. black and white contrast images, which can be captured with their inner and outer contours and depict the fire.
- the inner contour is put together in a 3-D model.
- the center of rotation is determined from the hip joint and represented with the help of the image analysis as a center of the ball together with the contour model (see figure).
- the shape of the stem of the prosthetic component can then be adapted to the shape of the medullary cavity.
- the areal density of the bone is determined on several, for example six to ten, preferably a total of nine sections, which are evenly distributed over the length of the proximal femur, in comparison to a corresponding section of a previously determined normal form. From this comparison, a correlation factor results as a measure of the strength of the individual bone, on the basis of which the ratio of the prosthesis to the medullary cavity cross-section is determined.
- the contour model of the medullary cavity is reduced eccentrically and / or concentrically by 20 to 30% in order to determine the cross section of the prosthetic component in the relevant cutting plane. If the specific bone density is smaller than that of the normal femur, the contour model is reduced correspondingly more in order to determine the cross-section of the prosthesis.
- the values can be interpolated between the individual cutting planes.
- the prosthesis cross sections are preferably determined in such a way that the layer thickness of the bone cement sheath surrounding the prosthesis is approximately inversely proportional to the respective bone density.
- the data record of the contour model is passed on to a CAD unit together with the rotation center.
- the axis of the contour model is determined and the undercuts in the design are corrected in such a way that the prosthetic components are inserted into the marrow cavity in a straight line and / or with a slight screwing motion, without bumping against the bone can.
- the construction thus obtained is returned to the image analysis unit, where a double contour model with the outer and inner contour of the femur is created, into which the prosthetic component can be fitted.
- the prosthesis component is projected into the ap x-ray image (anterior-posterior beam path) and axial x-ray image and inserted in each case along its implantation axis.
- the mass and / or rigidity of the prosthesis is determined in proportion to the bone density.
- the CAD data set is then completed with the standard construction data of the neck cone for the ball head receptacle and for the implantation instruments (insertion / extraction of the prosthesis) and passed on to a milling unit.
- the prosthesis component is milled from a blank, for example in V 4 A steel. After processing the surface, the prosthesis component is washed and sterilized and is then ready for use.
- FIG. 1 shows an embodiment of the prosthesis component according to the invention, cross-sections of the prosthesis and of the inner and outer contour model of the femur being shown in different sectional planes for a more detailed explanation.
- the prosthesis is shown as a front view (in the implanted state).
- the prosthesis shown schematically in the femur bone has an attachable spherical head 1, which is seated on a cone 2 of the prosthesis neck 3.
- the rotation center is designated by the reference number 4.
- the neck 3 is firmly connected to a shaft 5 of the prosthesis.
- the optimal shaft cross sections 5 ′ which result in the manner described above are drawn in the cutting planes, which are distributed approximately uniformly over the length of the proximal femur and in which the surface density of the bone is determined.
- eight shaft cross sections 5 1 are shown hatched and, in addition, three shaft cross sections are drawn out for clarification.
- the bone density and the resulting optimum shaft cross section are preferably determined in six to ten, for example nine, sectional planes.
- Reference number 6 shows the outer contour model and reference number 7 the inner contour model of the femur as an example in the individual sectional planes, which each result from the image analysis. Furthermore, the bone cement 8 (cement sheath) surrounding the prosthesis component is shown schematically.
- the mass and / or rigidity of the prosthesis in the individual sectional planes can be suitably designed Shaft cross sections 5 'can be set. If, for example, a low mass is desired, the slot or the recess in the U-shaped cross section of the shaft is correspondingly enlarged, the greatest possible surface being available for the force transmission between the prosthesis and bone in the medial region of the prosthesis. When changing the specific mass in a sectional plane, the stiffness of the prosthesis component generally also changes in this area.
- the reference number 10 denotes the construction axis of the prosthesis, which at the same time also represents the medullary cavity axis and the implantation axis.
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Manufacturing & Machinery (AREA)
- Animal Behavior & Ethology (AREA)
- Veterinary Medicine (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Transplantation (AREA)
- Physics & Mathematics (AREA)
- Cardiology (AREA)
- Geometry (AREA)
- Human Computer Interaction (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Prostheses (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP93909837A EP0637230A1 (de) | 1992-04-24 | 1993-04-26 | Mit knochenzement zu verankernde femurprothesenkomponente und verfahren zu ihrer herstellung |
JP5518899A JPH07508189A (ja) | 1992-04-24 | 1993-04-26 | 骨接合剤の手段により固定するための大腿骨の人工構成部及びその製造方法 |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4213599A DE4213599A1 (de) | 1992-04-24 | 1992-04-24 | Prothesenkomponente und Verfahren zu ihrer Herstellung |
DE4213598A DE4213598A1 (de) | 1992-04-24 | 1992-04-24 | Zementfreie Femurprothesenkomponente und Verfahren zu ihrer Herstellung |
DEP4213597.4 | 1992-04-24 | ||
DE4213597A DE4213597A1 (de) | 1992-04-24 | 1992-04-24 | Mit Knochenzement zu verankernde Femurprothesenkomponente und Verfahren zu ihrer Herstellung |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1993021862A1 true WO1993021862A1 (de) | 1993-11-11 |
Family
ID=27203664
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1993/001003 WO1993021864A1 (de) | 1992-04-24 | 1993-04-26 | Zementfreie femurprothesenkomponente und verfahren zu ihrer herstellung |
PCT/EP1993/001001 WO1993021862A1 (de) | 1992-04-24 | 1993-04-26 | Mit knochenzement zu verankernde femurprothesenkomponente und verfahren zu ihrer herstellung |
PCT/EP1993/001002 WO1993021863A1 (de) | 1992-04-24 | 1993-04-26 | Prothesenkomponente und verfahren zu ihrer herstellung |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP1993/001003 WO1993021864A1 (de) | 1992-04-24 | 1993-04-26 | Zementfreie femurprothesenkomponente und verfahren zu ihrer herstellung |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1993/001002 WO1993021863A1 (de) | 1992-04-24 | 1993-04-26 | Prothesenkomponente und verfahren zu ihrer herstellung |
Country Status (5)
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US (1) | US5554190A (de) |
EP (3) | EP0637230A1 (de) |
JP (3) | JPH07508191A (de) |
DE (3) | DE4213597A1 (de) |
WO (3) | WO1993021864A1 (de) |
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EP0093869A1 (de) * | 1982-04-10 | 1983-11-16 | Günther Dr. med. Aldinger | Individuell gestaltete Gelenkendoprothesen |
EP0289922A1 (de) * | 1987-05-06 | 1988-11-09 | Fried. Krupp Gesellschaft mit beschränkter Haftung | Gelenkprothese und Verfahren zu ihrer Herstellung |
DE3743329C1 (en) * | 1987-12-21 | 1989-06-22 | Krupp Gmbh | Endoprosthesis hollow stem for cement-free implantation |
WO1989010730A1 (en) * | 1988-05-11 | 1989-11-16 | Dall Desmond Meiring | Hip joint femoral prosthesis |
EP0358601A1 (de) * | 1988-08-30 | 1990-03-14 | GebràDer Sulzer Aktiengesellschaft | Verankerungsschaft für eine Endoprothese |
WO1990002533A2 (de) * | 1988-09-09 | 1990-03-22 | Klaus Draenert | Hüftgelenksprothese und ihre verwendung |
EP0479257A1 (de) * | 1990-10-03 | 1992-04-08 | Board Of Regents, The University Of Texas System | Verfahren zum Herstellen von Gelenkersatz nach Kundenwunsch |
Also Published As
Publication number | Publication date |
---|---|
DE4213599A1 (de) | 1993-10-28 |
EP0637231A1 (de) | 1995-02-08 |
EP0637230A1 (de) | 1995-02-08 |
JPH07508189A (ja) | 1995-09-14 |
EP0637232A1 (de) | 1995-02-08 |
WO1993021864A1 (de) | 1993-11-11 |
WO1993021863A1 (de) | 1993-11-11 |
DE4213598A1 (de) | 1993-10-28 |
DE4213597A1 (de) | 1993-10-28 |
JPH07508191A (ja) | 1995-09-14 |
JPH07508190A (ja) | 1995-09-14 |
US5554190A (en) | 1996-09-10 |
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