DE19708375A1 - Fixation of a tibia part on a tibial plateau of a knee joint endoprosthesis - Google Patents

Fixation of a tibia part on a tibial plateau of a knee joint endoprosthesis

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Publication number
DE19708375A1
DE19708375A1 DE19708375A DE19708375A DE19708375A1 DE 19708375 A1 DE19708375 A1 DE 19708375A1 DE 19708375 A DE19708375 A DE 19708375A DE 19708375 A DE19708375 A DE 19708375A DE 19708375 A1 DE19708375 A1 DE 19708375A1
Authority
DE
Germany
Prior art keywords
tibia
parts
knee joint
joint endoprosthesis
plateau
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE19708375A
Other languages
German (de)
Inventor
Dirk Baedorf
Hans-Georg Pfaff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ceramtec GmbH
Original Assignee
Ceramtec GmbH
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 GmbH filed Critical Ceramtec GmbH
Priority to DE19708375A priority Critical patent/DE19708375A1/en
Priority to CA002226240A priority patent/CA2226240A1/en
Priority to EP98100245A priority patent/EP0855172B1/en
Priority to DE59806837T priority patent/DE59806837D1/en
Priority to JP10005914A priority patent/JPH10201780A/en
Priority to US09/008,428 priority patent/US5968099A/en
Publication of DE19708375A1 publication Critical patent/DE19708375A1/en
Withdrawn legal-status Critical Current

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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
    • A61F2/389—Tibial components
    • 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
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • 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
    • 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
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    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • 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
    • A61F2002/30383—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove
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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
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    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30433—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
    • 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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    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • 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
    • A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
    • A61F2002/30507—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism using a threaded locking member, e.g. a locking screw or a set screw
    • 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
    • A61F2002/30316—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
    • A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
    • A61F2002/30514—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism using a locking washer
    • 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
    • A61F2/4637—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for connecting or disconnecting two parts of a prosthesis
    • A61F2002/4641—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for connecting or disconnecting two parts of a prosthesis for disconnecting
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • A61F2220/0041—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws
    • 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
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    • 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
    • A61F2310/00179—Ceramics or ceramic-like structures

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Physical Education & Sports Medicine (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)

Description

Die Erfindung befrifft eine Kniegelenkendoprothese nach dem Oberbegriff des An­ spruchs 1.The invention questions a knee joint endoprosthesis according to the preamble of the An saying 1.

Aus der EP 0 442 330 B1 ist eine Kniegelenkendoprothese mit einem Femurteil, ei­ nem Meniskuselement und einem Tibiateil bekannt, wobei das Femurteil und das Ti­ biateil mit Lagerflächen an zugeordneten Lagerflächen des Meniskuselements anlie­ gen.EP 0 442 330 B1 describes a knee joint endoprosthesis with a femur part, ei Nem meniscus element and a tibia part known, the femoral part and the Ti Apply part with bearing surfaces to assigned bearing surfaces of the meniscus element gene.

Das Tibiateil ist mit einem Tibiaplateau fest verbunden, wobei das Tibiaplateau im tibialen Knochen verankert ist und mit diesem verwachsen soll. Femurteil, Tibiateil und Meniskuselement sind bevorzugt aus einem keramischen Werkstoff hergestellt.The tibia part is firmly connected to a tibia plateau, the tibia plateau in the tibial bone is anchored and should grow together with it. Femoral part, tibia part and meniscus element are preferably made of a ceramic material.

Der Erfindung liegt die Aufgabe zugrunde, eine mechanisch stabile Verankerung des Tibiateils auf dem Tibiaplateau zu schaffen, die gegebenenfalls auch am implantierten Gelenk nachträglich gelöst und damit das Tibiateil ausgetauscht werden kann.The invention has for its object a mechanically stable anchorage of the To create tibia parts on the tibia plateau, which may also be implanted Joint subsequently released and the tibia part can be replaced.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß das oder die Tibiateile mit dem Tibiaplateau lösbar verklemmt, verschraubt und/oder verspannt sind.According to the invention this object is achieved in that the or the tibia parts with the tibia plateau are releasably clamped, screwed and / or braced.

Hierdurch sind die Tibiateile zwar fest auf dem Tibiaplateau verankert, jedoch ist die Verankerung gegebenenfalls auch am implantierten Gelenk nachträglich lösbar, wo­ durch das Tibiateil oder die Tibiateile leicht ausgetauscht werden können.As a result, the tibia parts are firmly anchored on the tibia plateau, but the Anchoring can also be detached later on the implanted joint, where can be easily replaced by the tibia part or the tibia parts.

In bevorzugter Ausführungsform ist auf dem Tibiaplateau ein Spannelement über eine Fixierschraube befestigt, welches die Tibiateile verklemmt und/oder verspannt. Durch Lösen der Fixierschraube läßt sich das Spannelement entfernen und so die Tibiateile entnehmen. In a preferred embodiment, a clamping element is on the tibial plateau Fixing screw attached, which clamps and / or braces the tibia parts. By Loosening the fixing screw can remove the clamping element and thus the tibia parts remove.  

Vorzugsweise ist das Spannelement zwischen den Tibiateilen angeordnet und veran­ kert gleichzeitig beide Tibiateile auf dem Tibiaplateau.The tensioning element is preferably arranged and arranged between the tibia parts kernels both parts of the tibia on the tibial plateau at the same time.

Vorteilhafterweise weist die zum Spannelement gewandte Seitenfläche des Tibiateils und die angrenzende Seitenfläche des Spannelements eine zueinander passende Abschrägung auf, wobei die Abschrägung des Spannelements auf der Abschrägung des Tibiateils aufliegt. Hierdurch ist eine stabile Verankerung durch Klemmen bzw. Verankern erreicht.The side surface of the tibia part facing the clamping element advantageously has and the adjacent side surface of the tensioning element is a matching one Bevel on, the bevel of the tensioning element on the bevel of the tibia part. This ensures stable anchoring by clamping or Anchoring achieved.

In vorteilhafter Ausgestaltung sind die Tibiateile in eine Einbuchtung des Tibiapla­ teaus eingelegt. Dies vereinfacht die Verankerung, da die Tibiateile durch den Rand der Einbuchtung horizontal fixiert sind.In an advantageous embodiment, the tibia parts are in an indentation of the tibia plate teaus inserted. This simplifies anchoring because the tibia parts pass through the edge of the indentation are fixed horizontally.

Vorteilhafterweise ist zumindest eine der Seitenflächen der Einbuchtung mit einer Ein­ kerbung versehen, die auf dem Tibiateil aufliegt. Das Tibiateil weist hierzu eine an die Einkerbung angepaßte Schräge auf, die in die Einkerbung hineinreicht.Advantageously, at least one of the side surfaces of the indentation is an on notch that rests on the tibia part. The tibia part has one for this purpose Notch adapted slope that extends into the notch.

In bevorzugter Ausführungsform bestehen die Tibiateile aus einem keramischen Werkstoff, wie z. B. Aluminiumoxid, während das Tibiaplateau aus z. B. einer Titanle­ gierung besteht.In a preferred embodiment, the tibia parts consist of a ceramic Material such as B. alumina, while the tibia plateau from z. B. a Titanle government exists.

Weitere Merkmale der Erfindung ergeben sich aus den beiden Figuren, die nachfol­ gend beschrieben sind.Further features of the invention result from the two figures that follow described.

Fig. 1 zeigt einen Schnitt durch einen tibialen Knochen 5 mit aufgesetztem Tibiapla­ teau 2 und eingesetzten Tibiateilen 1. Nicht gezeigt ist der Rest der Kniegelenkendo­ prothese, nämlich das Femurteil und die Meniskuselemente. Fig. 1 shows a section through a tibial bone 5 with attached Tibiapla Château 2 and tibial parts 1 used. The rest of the knee joint prosthesis, namely the femoral part and the meniscal elements, is not shown.

Das Tibiaplateau 2 ist plattenförmig ausgebildet und weist eine Einbuchtung 7 auf der zum Femurteil gewandten Seite auf. In diese Einbuchtung 7 sind zwei Tibiateile 1 aus einem keramischen Werkstoff eingesetzt. Diese Tibiateile 1 berühren die Seitenflä­ chen der Einbuchtung 7 und sind über ein mittig angeordnetes Spannelement 3 ver­ ankert. Das Spannelement 3 ist über eine Fixierschraube 4 auf dem Tibiaplateau 2 befestigt. Das Spannelement 3 verklemmt und/oder verspannt gleichzeitig beide Tibia­ teile 1.The tibia plateau 2 is plate-shaped and has an indentation 7 on the side facing the femoral part. Two tibia parts 1 made of a ceramic material are inserted into this indentation 7 . These tibia parts 1 touch the Seitenflä surfaces of the indentation 7 and are anchored ver via a centrally arranged clamping element 3 . The tensioning element 3 is fastened to the tibia plateau 2 by means of a fixing screw 4 . The tensioning element 3 clamps and / or braces both tibia parts 1 at the same time.

Zur besseren Verankerung sind die aneinanderliegenden Seitenflächen des Tibiateils 1 und des Spannelements 3 mit einer zueinanderpassenden Abschrägung 6 verse­ hen, wobei die Abschrägung des Spannelements 3 auf der Abschrägung des Tibia­ teils 1 aufliegt.For better anchoring, the adjacent side surfaces of the tibia part 1 and the tensioning element 3 are provided with a matching bevel 6 , the beveling of the tensioning element 3 resting on the bevel of the tibia part 1 .

Zur zusätzlichen Verankerung ist mindestens eine der Seitenflächen der Einbuchtung 7 mit einer Einkerbung 8 versehen, in die die angrenzende Seitenfläche des Tibiateils 1 hineinragt, so daß die Seitenfläche der Einkerbung 8 auf der Schräge des Tibiateils 1 aufliegt. Diese Einkerbung 8 ist vorteilhafterweise auf allen Seitenflächen des Ti­ biaplateaus 2 angeordnet.For additional anchoring, at least one of the side surfaces of the indentation 7 is provided with a notch 8 into which the adjacent side surface of the tibia part 1 protrudes, so that the side surface of the notch 8 rests on the slope of the tibia part 1 . This notch 8 is advantageously arranged on all side surfaces of the Ti bioplate 2 .

Die Tibiateile 1 bestehen aus einem keramischen Werkstoff, während das Spannele­ ment 3 wie auch das Tibiaplateau 2 aus einer Titanlegierung hergestellt sind.The tibia parts 1 are made of a ceramic material, while the Spannele element 3 and the tibia plateau 2 are made of a titanium alloy.

Durch Lösen der Fixierschraube 4 und Entfernen des Spannelements 3 läßt sich das Tibiateil 1 bzw. die beiden Tibiateile 1 leicht aus dem Tibiaplateau 2 nach medial ent­ nehmen.By loosening the fixing screw 4 and removing the tensioning element 3 , the tibia part 1 or the two tibia parts 1 can be easily removed from the tibial plateau 2 towards the medial side.

Fig. 2 zeigt eine Draufsicht auf ein Tibiaplateau 2 mit eingesetzten Tibiateilen 1 ge­ mäß der fig. 1 von der Femurseite. Gut zu erkennen ist, wie das Spannelement 3 auf der Abschrägung 6 (siehe Fig. 1) der Tibiateile 1 aufliegt und diese so festlegt. Fig. 2 shows a plan view of a tibia plateau 2 with inserted tibia parts 1 ge according to the fig. 1 from the femoral side. It can be clearly seen how the clamping element 3 rests on the bevel 6 (see FIG. 1) of the tibia parts 1 and thus fixes them.

Die Tibiateile 1 können auch direkt mit dem Tibiaplateau 2 verschraubt sein. Hierzu ist eine Bohrung in den Tibiateilen 1 erforderlich, in der eine Schraube eingelassen ist. Die Befestigung kann auf alle erdenklichen Arten erfolgen, sie muß jedoch lösbar ausgebildet sein.The tibia parts 1 can also be screwed directly to the tibia plateau 2 . This requires a hole in the tibia parts 1 , in which a screw is inserted. The attachment can be done in all imaginable ways, but it must be designed to be detachable.

Claims (7)

1. Kniegelenkendoprothese mit einem im Femur verankerten Femurteil und einem mit dem tibialen Knochen verbundenen Tibiaplateau (2) auf dem als Gleitflächen Tibiateile (1) angeordnet sind und vorzugsweise mit zwischen dem Femurteil und den Tibiateilen (1) angeordneten Meniskuselementen, dadurch gekennzeich­ net, daß das oder die Tibiateile (1) mit dem Tibiaplateau (2) lösbar verklemmt, verschraubt und/oder verspannt sind.1. Knee joint endoprosthesis with a femur part anchored in the femur and a tibia plateau ( 2 ) connected to the tibial bone on which tibial parts ( 1 ) are arranged as sliding surfaces and preferably with meniscus elements arranged between the femur part and the tibia parts ( 1 ), characterized in that the or the tibia parts ( 1 ) are releasably clamped, screwed and / or clamped to the tibia plateau ( 2 ). 2. Kniegelenkendoprothese nach Anspruch 1, dadurch gekennzeichnet, daß auf dem Tibiaplateau (2) ein Spannelement (3) über eine Fixierschraube (4) befe­ stigt ist, welches die Tibiateile (1) verklemmt und/oder verspannt.2. knee joint endoprosthesis according to claim 1, characterized in that on the tibia plateau ( 2 ) a clamping element ( 3 ) via a fixing screw ( 4 ) BEFE Stigt, which clamps and / or braces the tibia parts ( 1 ). 3. Kniegelenkendoprothese nach Anspruch 2, dadurch gekennzeichnet, daß das Spannelement (3) zwischen den Tibiateilen (1) angeordnet ist und gleichzeitig beide Tibiateile (1) auf dem Tibiaplateau (2) verankert.3. Knee joint endoprosthesis according to claim 2, characterized in that the tensioning element ( 3 ) is arranged between the tibia parts ( 1 ) and at the same time anchors both tibia parts ( 1 ) on the tibia plateau ( 2 ). 4. Kniegelenkendoprothese nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die zum Spannelement (3) gewandte Seitenfläche des Tibiateils (1) und die angrenzende Seitenfläche des Spannelements (3) eine zueinanderpassende Abschrägung aufweisen, wobei die Abschrägung des Spannelements (3) auf der Abschrägung des Tibiateils (1) aufliegt.4. knee joint endoprosthesis according to claim 2 or 3, characterized in that the clamping element ( 3 ) facing side surface of the tibia part ( 1 ) and the adjacent side surface of the clamping element ( 3 ) have a matching bevel, the bevel of the clamping element ( 3 ) on the Bevel of the tibia part ( 1 ) rests. 5. Kniegelenkendoprothese nach einem der Ansprüche 1 bis 4, dadurch gekenn­ zeichnet, daß die Tibiateile (1) in eine Einbuchtung (7) des Tibiaplateaus (2) eingelegt sind.5. Knee joint endoprosthesis according to one of claims 1 to 4, characterized in that the tibia parts ( 1 ) are inserted into an indentation ( 7 ) of the tibial plateau ( 2 ). 6. Kniegelenkendoprothese nach Anspruch 5, dadurch gekennzeichnet, daß zu­ mindest eine der Seitenflächen der Einbuchtung (7) mit einer Einkerbung (8) versehen ist, die auf dem Tibiateil (1) aufliegt. 6. Knee joint endoprosthesis according to claim 5, characterized in that at least one of the side surfaces of the indentation ( 7 ) is provided with a notch ( 8 ) which rests on the tibia part ( 1 ). 7. Kniegelenkendoprothese nach einem der Ansprüche 1 bis 6, dadurch gekenn­ zeichnet, daß die Tibiateile (1) aus einem keramischen Werkstoff bestehen.7. Knee joint endoprosthesis according to one of claims 1 to 6, characterized in that the tibia parts ( 1 ) consist of a ceramic material.
DE19708375A 1997-01-17 1997-03-01 Fixation of a tibia part on a tibial plateau of a knee joint endoprosthesis Withdrawn DE19708375A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE19708375A DE19708375A1 (en) 1997-01-17 1997-03-01 Fixation of a tibia part on a tibial plateau of a knee joint endoprosthesis
CA002226240A CA2226240A1 (en) 1997-01-17 1998-01-06 Fixation of a tibial part on a tibial plate of a knee-joint endoprosthesis
EP98100245A EP0855172B1 (en) 1997-01-17 1998-01-09 Fastening of a tibial piece on a tibilal tray of a knee prosthesis
DE59806837T DE59806837D1 (en) 1997-01-17 1998-01-09 Fixation of a tibia part on a tibia plateau of a knee joint endoprosthesis
JP10005914A JPH10201780A (en) 1997-01-17 1998-01-14 Intracorporeal protease for knee joint
US09/008,428 US5968099A (en) 1997-01-17 1998-01-16 Fixation of a tibial part on a tibial plate of a knee-joint endoprosthesis

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19701622 1997-01-17
DE19708375A DE19708375A1 (en) 1997-01-17 1997-03-01 Fixation of a tibia part on a tibial plateau of a knee joint endoprosthesis

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DE19708375A1 true DE19708375A1 (en) 1998-07-23

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DE19708375A Withdrawn DE19708375A1 (en) 1997-01-17 1997-03-01 Fixation of a tibia part on a tibial plateau of a knee joint endoprosthesis
DE59806837T Expired - Fee Related DE59806837D1 (en) 1997-01-17 1998-01-09 Fixation of a tibia part on a tibia plateau of a knee joint endoprosthesis

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DE59806837T Expired - Fee Related DE59806837D1 (en) 1997-01-17 1998-01-09 Fixation of a tibia part on a tibia plateau of a knee joint endoprosthesis

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