WO2000045750A1 - Endoprothese de la hanche dans laquelle au moins la surface d'articulation de la tete du femur est remplacee - Google Patents

Endoprothese de la hanche dans laquelle au moins la surface d'articulation de la tete du femur est remplacee Download PDF

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Publication number
WO2000045750A1
WO2000045750A1 PCT/EP2000/000184 EP0000184W WO0045750A1 WO 2000045750 A1 WO2000045750 A1 WO 2000045750A1 EP 0000184 W EP0000184 W EP 0000184W WO 0045750 A1 WO0045750 A1 WO 0045750A1
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WO
WIPO (PCT)
Prior art keywords
ball
endoprosthesis according
hip endoprosthesis
pin
hip
Prior art date
Application number
PCT/EP2000/000184
Other languages
German (de)
English (en)
Inventor
Hans-Georg Pfaff
Michael Debruyckere
Original Assignee
Ceramtec Ag Innovative Ceramic Engineering
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ceramtec Ag Innovative Ceramic Engineering filed Critical Ceramtec Ag Innovative Ceramic Engineering
Priority to AU27965/00A priority Critical patent/AU2796500A/en
Publication of WO2000045750A1 publication Critical patent/WO2000045750A1/fr

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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
    • A61F2/32—Joints for the hip
    • 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
    • A61F2/3601—Femoral heads ; Femoral endoprostheses for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices
    • A—HUMAN NECESSITIES
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    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A—HUMAN NECESSITIES
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    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
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    • 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
    • A61F2002/30199—Three-dimensional shapes
    • A61F2002/30205—Three-dimensional shapes conical
    • A61F2002/3021—Three-dimensional shapes conical frustoconical
    • A—HUMAN NECESSITIES
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    • 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
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    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
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    • 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
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    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A—HUMAN NECESSITIES
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    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30891—Plurality of protrusions
    • A61F2002/30892—Plurality of protrusions parallel
    • 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
    • A61F2/34—Acetabular cups
    • A61F2002/3412—Acetabular cups with pins or protrusions, e.g. non-sharp pins or protrusions projecting from a shell surface
    • 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
    • A61F2/34—Acetabular cups
    • A61F2002/3445—Acetabular cups having a number of shells different from two
    • A61F2002/3446—Single cups
    • 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
    • A61F2/34—Acetabular cups
    • A61F2002/348—Additional features
    • A61F2002/3495—Spherical shell significantly smaller than a hemisphere, e.g. extending over less than 160 degrees
    • A—HUMAN NECESSITIES
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    • 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
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    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3611—Heads or epiphyseal parts of femur
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • 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
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    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
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    • A—HUMAN NECESSITIES
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    • 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
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    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2002/3678—Geometrical features
    • A61F2002/3686—Geometrical features bent
    • A—HUMAN NECESSITIES
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    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
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    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063—Three-dimensional shapes
    • A61F2230/0067—Three-dimensional shapes conical
    • A—HUMAN NECESSITIES
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    • 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
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    • A61F2310/00005—The prosthesis being constructed from a particular material
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    • A61F2310/00029—Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
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    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00179—Ceramics or ceramic-like structures
    • A61F2310/00185—Ceramics or ceramic-like structures based on metal oxides
    • A61F2310/00203—Ceramics or ceramic-like structures based on metal oxides containing alumina or aluminium oxide
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    • A61F2310/00389—The prosthesis being coated or covered with a particular material
    • A61F2310/00592—Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
    • A61F2310/00796—Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite

Definitions

  • Hip endoprosthesis in which at least the articulation surface of the femoral head is replaced
  • the invention relates to a hip endoprosthesis according to the preamble of the first claim.
  • the bone substance of the joint partner is replaced by prostheses in order to restore the joint function. If the acetabular cup is still intact, the full or partial replacement of the femoral head may be sufficient.
  • a total replacement of both joint partners is required, both by implanting an artificial femoral head and by implanting an acetabular cup.
  • a total replacement in particular leads to a profound intervention in the bone substance with corresponding bone loss. For this reason, attempts have always been made to preserve the bone substance and its viability as far as possible.
  • a prosthesis for the femoral head is known from DE-PS 1 164 019. It has the shape of a hollow sphere, consists of a biocompatible metal and is anchored in the thigh neck with pins welded to its inner surface. When fitting the cap, the pins must be aligned precisely and correctly in relation to the holes due to their position.
  • the head prosthesis is adapted to the bone surface by means of hardenable plastic filled into the hollow sphere. Due to its insulating effect, the plastic is also intended to prevent any corrosive influences between the pin attachments, ie between the welds inside the ball.
  • a device is required with which it is possible to drill the holes for anchoring the pins in the correct places in the femur neck.
  • the filling of the hollow sphere with plastic mass must be done carefully so that no voids are created.
  • the amount of plastic must be such that the position of the cap, for example by lifting, does not change when it hardens.
  • the object of the present invention is to present a hip endoprosthesis, the use of which limits bone loss to a necessary minimum, in order to maintain a bone stock, in particular in young patients with a long life expectancy, which can be used in the event of a due reoperation.
  • the hip endoprosthesis according to the invention it is possible, depending on the stage of wear, to replace the joint partners accordingly. If the acetabulum is in a state that still permits its function as a joint partner, the femoral head becomes essentially replaced in the part that encompasses the articulation surface.
  • the replacement takes place according to the invention by a solid ball which consists entirely of the same, biocompatible material.
  • the dimensions of this sphere are adapted to the dimensions of the articulation surface of the natural femoral head.
  • a solid ball has the advantage that it cannot deform under loads.
  • extensive coverage of the bone tissue with the disadvantages listed above is avoided. It is fastened with only one pin in the femur neck, so that the bone substance only has to be drilled at one point.
  • the ball is advantageously attached to the pin by means of a conical plug connection.
  • the attachment of balls by means of conical plug connections in the hip endoprosthesis is easy to handle and has proven itself for years.
  • the conical connector allows the pin to be implanted in the bone first and then the ball to be put on. In contrast to a cap, the ball does not need to be aligned.
  • the pin consists of a cone-shaped pin for attaching the ball and a subsequent anchoring part, which is implanted in the bone.
  • the ball has a recess.
  • the ball is placed on the neck of the femoral head on the femur neck, which is adapted to the recess.
  • the recess is designed so that when the joint is stressed, in particular perpendicular to the pin, the protruding bone tissue supports the ball against lateral displacement. The shear forces on the pin are reduced and local, one-sided force effects of the pin on the bone are avoided.
  • a simple to produce and effective shape of the recess is a conical recess in the ball.
  • the attachment of the femoral head to the femur neck is milled accordingly.
  • the cone angle can be the size of the Ball, in particular its diameter, and the available bone substance on which the ball is to be supported. It is in a range from 80 to 170 degrees. A range from 100 to 130 degrees is preferred the hole into which the pin is implanted, with which the ball is attached to the bone
  • the prosthesis can be optimally matched to the geometry of the joint to be restored.
  • the center of the ball can lie on the center line of a straight pin.
  • the symmetry of the ball in relation to its recess can also be aligned with the Include an angle of up to 20 degrees between the center line of the anchoring part of the pin inserted in the bone. This deviation then also exists between the center line of the pin and the center line of the anchoring part of the pin
  • the pin inserted into the bone tapers towards its end that faces away from the ball
  • the length and the diameter of the pin anchored in the bone are matched to the dimension of the bone so that the anchoring takes place essentially in the hard bone tissue.
  • the diameter and length of the pin must therefore be based on that Age and body structure of the patient as well as the available bone tissue can be coordinated.
  • the dimensions of the pins in adolescents and short stature patients who are not yet fully grown may differ in diameter and length from the dimensions intended for adults with an adult bone structure and a strong stature
  • the ball is also made from a biocompatible material. All biocompatible materials can be used in the Prosthetics applicable metals and ceramic materials are called. Since the fastening pin for the ball does not have to be firmly connected to this ball, the choice of the material of the ball can be matched to the respective application, in particular to the material of a pan.
  • Ceramic has proven to be advantageous, particularly when a spherical head has an implanted socket as a joint partner. Endoprostheses in which ceramic is articulated by ceramic have the lowest abrasion rate. Ceramic balls are anchored in the bone with metal pins, since ceramic and metal do not interact with one another that cause corrosion.
  • the ball can be roughened on its non-articulated surface.
  • it can carry an osteoconductive layer, for example made of hydroxylapatite, which enables the bone to grow into the ball and thus enable the ball to be anchored particularly well on the bone.
  • the hip endoprosthesis according to the invention enables the ball to articulate the acetabulum directly when it is still in a suitable state. However, if the acetabulum is also affected by wear or illness, then according to the invention, only the main load area of the acetabulum is replaced by an implanted pan, which then articulates the ball.
  • the socket is limited to a functional angle between 90 and 170 degrees.
  • Ball material is matched that the material pairing is tribologically optimal.
  • Tribologically possible are, for example, pairings between balls made of cobalt chrome and pan inserts made of polyethylene or between ceramic balls and pan inserts made of polyethylene.
  • the surface of the socket inserted into the bone has elements for increasing the tilting stability.
  • webs can be provided for this purpose, which rise in the vertical or almost vertical direction from the plane of the pan inserted into the bones. They are inserted into a correspondingly milled recess in the hip bone.
  • the pan can also be roughened on the surface to be inserted into the bone. In addition to roughening or alone, it can also wear an osteoconductive layer to facilitate and accelerate waxing in the hip bones.
  • FIG. 1 shows a cup of the hip endoprosthesis according to the invention made of ceramic, cut,
  • FIG. 2 shows a ball as a prosthesis of the femoral head, cut, 3 shows a ball anchored in the thigh bone by means of a pin, which articulates a socket implanted in the hip bone, and
  • FIG. 4 shows a prosthesis with a composition of ball and pin as a conical plug connection, the center line of the pin and the axis of symmetry of the ball enclosing an angle of 10 degrees and the implanted ball articulating the acetabulum directly.
  • 1 denotes an acetabular cup.
  • it consists of ceramic, for example of high-purity aluminum oxide.
  • it can also consist of another biocompatible material such as metal, for example cobalt-chrome, or plastic, for example polyethylene.
  • the choice of material depends on the material of the other joint partner, the prosthesis of the femoral head. It is made in such a way that there is a tribologically optimal material pairing, for example ceramic pan with ceramic head or polyethylene pan with ceramic or metal.
  • the socket 1 has a recess, the functional surface 2, in the form of a spherical cap for receiving the prosthesis of the femoral head, a ball.
  • the surface 3, as shown here in the left half of the figure, can be roughened, as designated by the reference number 5, in order to allow the bone tissue to grow in and thus to better anchor it in the bone.
  • the surface 3 can be coated with an osteoconductive layer, not shown here, for example hydroxylapatide, which also promotes the ingrowth of the bone tissue.
  • the functional angle 6, which includes the functional surface 2, lies at 100 degrees at the lower end of the claimed angular range.
  • the prosthesis of the femoral head shown in FIG. 2 is a solid ball 7, which in the present exemplary embodiment consists of ceramic, for example of high-purity aluminum oxide.
  • Other biocompatible materials are also possible, whereby their selection depends on whether the prosthesis of the femoral head articulates the acetabulum directly or a cup. In the latter case, as already mentioned above, attention should be paid to a tribologically optimal material pairing.
  • the shape of the femoral head prosthesis 7 corresponds to that of the known ball head prostheses.
  • the dimensions of the articulation surface 8 are adjusted to the dimensions of the natural femoral head. It is attached to the thigh bone with a pin.
  • the ball 7 is fastened on this pin by means of a conical plug connection, as is already known from hip arthroplasty.
  • a slightly conical bore 9 is provided for plugging onto the pin.
  • the ball 7 has a recess 10 which is conical in the present case. It connects to the bore 9 and is arranged symmetrically to this.
  • the imaginary tip 12 of the recess 10 thus lies on the line of symmetry 11 of the ball 7.
  • the Kegeiwinkel 12 can be adjusted to the size of the ball, in particular its diameter, and the available bone substance on which the ball is to be supported. It is in the range of 80 to 170 degrees. A range of 100 to 130 degrees is preferred.
  • FIG. 3 shows a ball anchored in the femur neck by means of a pin, which articulates with a socket 1 implanted in the hip bone 15.
  • a pin which articulates with a socket 1 implanted in the hip bone 15.
  • the femoral head on the thigh bone 16 has been severed at the level of its shoulder on the thigh neck 17.
  • a slightly conical bore 21 is made in the femur neck 17 through the tip 19 of the conical milled bone contour 18, centered on its center line 20.
  • a pin 22 is implanted in it, the conically tapered anchoring part 23 is inserted in the bore 21.
  • the end of the pin 22 protruding from the bone is a conical pin 24 on which the ball 7 with its bore 9 is placed.
  • the anchoring part 23 of the pin 22 is first driven into the bore 21. Because of its taper, there is a tight fit in the bone. Then the ball 7 with its conical bore 9 is placed on the pin 24 and a slight fit with the pin 24 is achieved by light impacts on the ball. The surface of the recess 10 is supported on the conically milled stump 18 of the femoral neck 17. In particular in the case of loads in which the force acting on the ball 7 is essentially perpendicular to the center line 20 of the pin 22, the force is better introduced into the bone. as if the ball and the bone meet in a plane perpendicular to the center line of the pin. - 10 -
  • FIG. 4 shows a prosthesis of a femoral head in which the femoral head prosthesis, the ball, articulates the acetabulum 26 directly.
  • the center line 120 of the pin 122 and the line of symmetry 11 of the ball 7 enclose an angle of 10 degrees.
  • the ball 7 corresponds to the ball shown in FIGS. 2 and 3.
  • the shape of the pin 122 implanted in the femur 17 differs from the pin 22 of FIG. 3.
  • the center line 120 of the conical anchoring part 123 forms an angle 25 of 10 degrees with the line of symmetry 11 of the ball 7.
  • the center line of the pin 124, which carries the ball 7, coincides with the line of symmetry 11 of the ball.
  • the material of the pen consists of a high-strength, biocompatible metal, such as a titanium alloy or an alloy of cobalt, chromium and molybdenum.
  • a high-strength, biocompatible metal such as a titanium alloy or an alloy of cobalt, chromium and molybdenum.
  • the anchoring part 123 of the pin can also be roughened and / or provided with an osteoconductive layer in order to enable better ingrowth in the bones.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Abstract

Il est proposé, selon l'invention, que la tête de fémur soit remplacée essentiellement par une tête synthétique se présentant sous la forme d'une bille (7) pleine, constituée complètement du même matériau biocompatible, que les dimensions de cette bille (7) soient adaptées aux dimensions de la surface d'articulation (8) de la tête de fémur naturelle et que cette bille (7) soit ancrée au moyen d'une tige (22) dans l'os (17) de la cuisse. S'il n'y a plus d'acétabule formant la surface naturelle d'articulation pour la tête de fémur artificielle, c'est-à-dire la bille (7), on implante dans l'os (15) de la hanche un cotyle artificiel.
PCT/EP2000/000184 1999-02-03 2000-01-13 Endoprothese de la hanche dans laquelle au moins la surface d'articulation de la tete du femur est remplacee WO2000045750A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU27965/00A AU2796500A (en) 1999-02-03 2000-01-13 Hip endoprosthesis in which at least the articular surface of the femoral head is replaced

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19904126.1 1999-02-03
DE1999104126 DE19904126A1 (de) 1999-02-03 1999-02-03 Hüftendoprothese, in der mindestens die Artikulationsfläche des Femurkopfes ersetzt ist

Publications (1)

Publication Number Publication Date
WO2000045750A1 true WO2000045750A1 (fr) 2000-08-10

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PCT/EP2000/000184 WO2000045750A1 (fr) 1999-02-03 2000-01-13 Endoprothese de la hanche dans laquelle au moins la surface d'articulation de la tete du femur est remplacee

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AU (1) AU2796500A (fr)
DE (1) DE19904126A1 (fr)
TW (1) TW527181B (fr)
WO (1) WO2000045750A1 (fr)

Cited By (1)

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US6524343B2 (en) 2000-03-27 2003-02-25 Benoist Girard Sas Femoral hip prosthesis

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EP1205163B1 (fr) * 2000-11-07 2009-04-15 Erik Leonard Hoffman Elément de fixation pour un implant, en particulier une prothèse de hanche
NL1016551C2 (nl) * 2000-11-07 2002-05-14 Erik Leonard Hoffman Bevestigingselement voor een implantaat, in het bijzonder een heupprothese.
ATE357889T1 (de) * 2001-05-18 2007-04-15 Peter Dr Med Copf Zementfreie hüftgelenksendoprothese als oberflächenersatz des proximalen femurs
DE20120241U1 (de) * 2001-12-14 2003-04-24 Keramed Medizintechnik Gmbh Gelenk-Endoprothese
GB0207170D0 (en) 2002-03-26 2002-05-08 Mcminn Derek J W Hip joint prosthesis
EP1407728B1 (fr) * 2002-10-07 2006-06-14 Zimmer GmbH Prothèse de tête fémorale
US20080195221A1 (en) * 2007-01-22 2008-08-14 Zimmer Gmbh Implant and a method for partial replacement of joint surfaces

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IT471394B (fr) * 1950-12-04 1952-05-14
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GB2139097A (en) * 1983-05-06 1984-11-07 Frederick F Buechel Implantable joint prosthesis
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DE3923154A1 (de) * 1989-07-13 1991-01-24 Orthoplant Endoprothetik Endoprothese zum teilersatz des gelenkkopfes eines menschlichen knochens
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WO1998007393A1 (fr) * 1996-08-21 1998-02-26 Industrial Research Limited Prothese de remplacement d'une articulation
DE19813074A1 (de) * 1998-03-25 1999-09-30 Ceram Tec Ag Innovative Cerami Klemmsitz-Verbindung zwischen Prothesenkomponenten von Gelenk-Prothesen

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Publication number Priority date Publication date Assignee Title
US6524343B2 (en) 2000-03-27 2003-02-25 Benoist Girard Sas Femoral hip prosthesis

Also Published As

Publication number Publication date
DE19904126A1 (de) 2000-08-10
AU2796500A (en) 2000-08-25
TW527181B (en) 2003-04-11

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