EP0689406A1 - Knee endoprosthesis - Google Patents

Knee endoprosthesis

Info

Publication number
EP0689406A1
EP0689406A1 EP19950904493 EP95904493A EP0689406A1 EP 0689406 A1 EP0689406 A1 EP 0689406A1 EP 19950904493 EP19950904493 EP 19950904493 EP 95904493 A EP95904493 A EP 95904493A EP 0689406 A1 EP0689406 A1 EP 0689406A1
Authority
EP
Grant status
Application
Patent type
Prior art keywords
bearing
surface
tibial
knee
body
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Withdrawn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
EP19950904493
Other languages
German (de)
French (fr)
Inventor
Bruno E. Dr. Gerber
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.)
Synthes GmbH
Original Assignee
Plus Endoprothetik AG
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

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/38Joints for elbows or knees
    • A61F2/3868Joints for elbows or knees with sliding tibial bearing
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/16Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
    • A61B17/17Guides or aligning means for drills, mills, pins or wires
    • A61B17/1739Guides or aligning means for drills, mills, pins or wires specially adapted for particular parts of the body
    • A61B17/1764Guides or aligning means for drills, mills, pins or wires specially adapted for particular parts of the body for the knee
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/88Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/88Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/92Impactors or extractors, e.g. for removing intramedullary devices
    • A61B2017/922Devices for impaction, impact element
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/03Automatic limiting or abutting means, e.g. for safety
    • A61B2090/033Abutting means, stops, e.g. abutting on tissue or skin
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316The 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
    • A61F2002/30329Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30433Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316The 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
    • A61F2002/30535Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30604Special structural features of bone or joint prostheses not otherwise provided for modular
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth
    • A61F2/30771Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes, grooves
    • A61F2002/30878Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes, grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30884Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2220/00Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0041Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2310/00Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005The prosthesis being constructed from a particular material
    • A61F2310/00011Metals or alloys
    • A61F2310/00023Titanium or titanium-based alloys, e.g. Ti-Ni alloys

Abstract

The invention concerns a knee endoprosthesis with a femur-mounted component (10), a tibia-mounted component (11) and, located between the femur-mounted and tibia-mounted components, a bearing body (12) made of plastic, in particular polyethylene, the bearing body (12) resting against a cup-shaped bearing surface (20) located on the tibia-mounted component (11) and facing the femur-mounted component (10) to form a slip joint. Jutting out from the bearing surface (20) on the tibia-mounted component is a stud-like or pin-like stop (21) which projects into a slot-shaped hole (22) in the bearing-body slip surface (32), which faces the bearing surface (20) on the tibia-mounted component, such that the bearing body (12) can be rotated on the bearing surface (20) on the tibia-mounted component and can also move longitudinally to a limited extent in the plane in which the knee bends.

Description

Knee endoprosthesis

description

The invention relates to a knee-joint endoprosthesis having a femur part, a tibia part and, disposed between the femoral and tibial part bearing body made of plastic, insbeson particular polyethylene, wherein the bearing body is supported gleitlagernd on a side facing the femur part of a spherical shell-shaped bearing surface of the tibia.

Such a knee-joint endoprosthesis is known from US-A-4,224,696. This knee endoprosthesis allows both a rotary movement and displacement movement of

Bearing body on the tibial bearing surface with. the result that a virtually lifelike movement of the knee joint is obtained. Lack of design measures, however, does not ensure accurate rotational and longitudinal guidance of the bearing body in the known knee replacement surgery. In addition, there is the danger that the bearing body on the tibial surface Lager¬ or "addition Rocks" tibial plate forwards or backwards.

Also available are also knee prostheses known that allow only a rotation of the bearing body relative to the tibial Lager¬ area, however, no transverse shift (TACK Knee Prosthesis System Company aldemar Link GmbH & Co., Hamburg, Prospekt 736 d-en 3.92) , In this knee joint prosthesis is indeed a relatively straightforward

Construction reached; but since the knee joint allows only a rotation of the bearing body, the natural movement can only be modeled as teil¬. However, measures see superiors who hold the bearing body in contact with the tibial bearing surface. When excessive rotational movement, however, there is again the danger of the femur from the bearing body lifts off with the possible consequence of undesirable dislocation.

The present invention has for its object to provide a knee-joint endoprosthesis of the kind mentioned so weiter¬ zubilden that an exact rotational and longitudinal guide is gewährlei¬ stet. Furthermore, to be safely avoided body on the tibial plate, an "Out swings" of storage.

At the same time is to ensure that similar does not increase as the natural knee, the flexion with increasing flexion and knee flexion.

This object is achieved by the characterizing features of claim 1, wherein the Unter¬ claims relate to preferred structural details. Particularly worthy of mention, however, the construction according to claim 2 appears, and then the journal or pin-like stopper is formed by a screwed in the tibia bearing surface head screw whose head holds the bearing body on the tibial bearing surface. Particularly advantageous details are described in claims 9 and 10, a "Out rocking" of the bearing body on the tibial

prevent storage area also; at the same time is reached by the inventive inclination of the tibial bearing surface, in that the bending resistance is relatively low even in the final stage of knee flexion and flexion, particularly in conjunction with a femur part with back increasingly decreasing radius.

Also of importance is the instruments described in the claims 13 and 14 in conjunction with a tibial bearing surface according to claim 12. Hereinafter, an embodiment of an inventive knee-joint endoprosthesis described with reference to the accompanying drawings. Show it:

Fig. 1 is a front view of a knee-joint endoprosthesis according to the invention in the inserted state;

Figure 2 is a side view of the knee joint endoprosthesis according to Fig. 1.

Fig. 3, the tibial bearing surface in plan view;

Figure 4 shows a femur part and the tibia part interposed between the bearing body made of plastic, particularly polyethylene, in plan view.

5 shows the bearing element according to FIG 4 in front elevation view showing different heights and widths..;

Fig. 6 shows the bearing element according to FIG. 4 'and 5 in

Side view, also illustrating different heights;

Fig. 7 is a retaining screw for the bearing member of FIGS. 4 to 6 on the tibial bearing surface in accordance with

Fig. 3;

Fig. 8 is an instrument to prepare the tibia for implantation of the tibial component of the knee joint endoprosthesis according to the invention, in perspective,

View;

. Fig. 9 is a part of the instrument according to Figure 8 in a perspective view; and

Fig. 10 shows a tibial bone cutter in side view. The illustrated in FIGS. 1 and 2, knee-joint endoprosthesis is composed of a femoral component 10, tibial component 11, and a zwi¬'s femoral and tibial component disposed bearing body 12 made of plastic, in particular polyethylene. Femoral part 10 and part 11 are Tibia¬ in known manner by pins 13, 14 and 15 with the thigh -bzw. Shin-bone verbun¬ to. The femoral component further includes a so-called femoral component 16 with two convexly curved sliding surfaces 17, 18, the korrespon¬ explode in the implanted state with complementary concave sliding surfaces on the upper side of the bearing body 12 so that between the bearing body 12 and femoral component 16, a so-called roll-sliding movement takes place.

On the femoral component 10 to the end facing the tibia part 11, a tibial bearing plate 19 is fixed. The femoral part 10 which faces the tibial bearing surface 20 is a spherical shell or spherically curved. Similarly, the bearing surface is associated underside of the bearing body 12 is excluded, so that the bearing body 12 without danger of lifting on the tibial bearing surface both rotatable and is supported displaceably in the knee flexion plane. In order from the knee bending plane to prevent a lateral displacement of the bearing body 12 out of the bearing body is guided on the tibial bearing surface 20 12th To this end, is at the tibial bearing surface 20, a pin-like stop 21 prior to entering at the tibial bearing surface 20 facing in a slot-like opening 22 supporting or sliding surface of the bearing body 12, as shown in Figs. 1 and 2 is recognizable. The pin-like stopper 21 is screwed on the tibial bearing surface 20 (see screw 23 in FIGS. 1 and 2). Furthermore, the upper and the femur 10 facing side of the pin 21 is hemispherical in shape. The Quer¬ cut and the inner corners of the slot-type opening or recess 22 in the bearing body 12 are adapted to the contour of the stop pin 21st This avoids lateral play between the bearing body 12 and tibial component 11 and get an exact guidance between bearing body 12 and tibial component 11 in knee flexion plane. Further, it is not obstructed by the described shape of the stop pin 21, a rotation of the tibia relative to the femur.

As can be Fig. 3 recognize, the tibial bearing plate is asymmetrical in plan view 19th The bearing body 12 has shown in FIG. 4 in plan view an approximately kidney-shaped outline on. It is in one piece from plastic, in particular

Polyethylene. The convex sliding surfaces 17, 18 of the femur slide 16 associated bearing shells are marked by the reference numeral 24 in Fig. 4. The above-mentioned reference to FIGS. 1 and 2 slot-like opening 22 in the bearing body 12 is formed in the embodiment according to FIGS. 4 to 6 as a continuous durch¬ passage 25. Through this passage, the threaded shank portion and a head screw can pass lead 26, as shown for example in Fig. 7. The head screw 26 is screwed 19 or its bearing surface 20 in the tibial bearing plate. The corresponding threaded bore is indicated in Fig. 3 by the reference numeral 27. The complementary threaded portion of the screw head 26 is hen verse¬ in Fig. 7 by the reference numeral 28. The screw head 29 has corresponding to FIG. 7, the shape of a lens. This screw head is mounted

State corresponding to Fig. 5 recessed from the bearing shells 24 of the bearing body 12. A collision with the Femurschlit¬ th 16 is excluded. The underside of the Schrau¬ benkopfes 29 abuts an inner edge 30 of the passage 25 so that is held by the cap screw 26, the bearing body 12 without play on the bearing surface 20 of the tibial bearing plate nineteenth Between the screw head 29 and Gewinde¬ portion 28 of the cap screw 26 is shown in FIG. 7 nor a cylindrical portion 31 is provided which rests free of play on the lateral boundary of the slot-like passageway 25 so that a precise guidance of the Lager¬ body 12 in the knee-bend plane is ensured.

The screw 26 can have instead of the threaded portion 28 has an internal thread with which the screw 26 can be screwed onto a threaded pin on the upper end of the tibial dome 15 °.

The lines 32 in Fig. 5 and Fig. 6 indicate a different high bearing body 12, while the lines 33 reveal the possible widths of the bearing body 12. Insofar as it is the graphic representation of different sizes of the bearing body 12 in height and width.

The lower boundary surface 34 of the cylindrical portion 31 of the cap screw 26 is flat. For adaptation to the concave tibial bearing surface 20 is on one side connected between convexly curved ring.

All parts with the exception of the bearing body 12 are preferably made of titanium or a titanium alloy. The Lager¬ surfaces may additionally be provided with a ceramic layer.

Referring to FIG. 2, it should be mentioned that in the context of the described knee-joint endoprosthesis of all wesentli cher importance is inclined downward to the rear position of the kugel¬ shell-shaped bearing surface 20. The angle of inclination to the horizontal counter is marked with a. The angle beta between the spherical shell-shaped bearing surface 20 and the Tibiaächse, which coincides with the geometric longitudinal center axis 37 of the tibial dome 15, is the angle α smaller than 90 °. The inclination angle is preferably 5 to 15 °, in particular approximately 10 °. Accordingly, the angle ß is 75 ° to 85 °, in particular about 80 °. The inclination of the spherical shell-shaped bearing surface 20 is defined by the inclination of the straight line connecting the two end points of the bearing surface in knee flexion plane (in Fig. 2 the drawing plane). Accordingly, the geometric center 36 of the spherical shell-shaped bearing surface 20 of the tibia 11 is gegen¬ coincides in extension across the central longitudinal axis 37 of the tibial dome 15, which prosthesis with the Tibiaächse and accordingly with the central longitudinal axis of the stretched knee-joint endoprosthesis or knee joint Endo¬, offset to the rear. The described inclination of the kugelschalen¬ shaped bearing surface 20 of the tibial part 11 backward and downward is ensured that the flexion resistance does not increase in the final phase of knee flexion, as is the case also in the natural knee. By the sphericity of the bearing surface 20 in addition it is ensured that a sufficient resistance to sliding of the bearing body on the rear edge of the bearing surface is also still present in the knee bending end position.

In addition, the mandrel 15 relative to the tibial Mittel¬ the spherical shell-shaped bearing surface 20 of the longitudinal axis Tibia¬ part 11 is displaced forward (see also Fig. 2). Also this relative position between the spherical shell-shaped bearing surface 20 and mandrel 15 approaches the proximal end of the tibia, the natural knee joint loan. In particular, the introduction of force into the tibia is then perpendicular to the implant-abutment surfaces so that even after prolonged use a loosening of the tibial component is unlikely. The introduction of force into the tibia is optimal.

The abovementioned measures and consequent Vor¬ parts are prior art according to the aforementioned US-A-4,224,696 also can not be removed.

As already mentioned above, the tibial bearing surface is formed by a kugelschalenformig shaped plate 20 whose thickness is about 1.0 to 2.0 mm. By this measure, it is possible to remove only a minimum of bone material at the proximal end of the tibia. It is necessary, however, to form the proximal end of the tibia correspondingly concave. To this end, an instrument according to Fig. Vorge beat 8, which is characterized by a percussion device 43 having a distal tibial mold part 38 and a proximal face 39, the distal tibial mold part 38 has a convexly curved mold surface 40 to the corresponding concave molding having the proximal end of the tibia. The tibial mold part 38 is attachable to the proximal end of the percussion device 43 in the direction of arrow 44th The striking surface 39 is located exactly above the mold surface 40, so that it can be correspondingly concavely formed by one or proxi¬ paint more blows on the striking face 39 or the like with a hammer or the like. Percussive tool the cancellous bone at the first plan-sectional area of ​​the tibia, namely is such that the tibial bearing plate 19 is exactly fittable so as indicated in Fig. 2.

After shaping of the proximal section surface of the tibia by means of the stamp-like mold part 38 is a hole for the tibial mandrel 15 is produced therethrough by means of a bone milling cutter. For this purpose a bore 41 for guiding the above-mentioned bur is in the tibia molding 38 42 corresponding to FIG. 10 are formed. The bore 41 is pla¬ sheet that the tibial mandrel bore herstell¬ in exact association with the bearing surface 20 of tibial component 11 to be implanted is bar. For fixing the tibia molding 38 on the striker 43, the tibial molded part 38 has two transverse slots 45, of which in Fig. 8 only one is visible. In these transverse slots 45 complementary holding forks 46 of the percussion device 43 are inserted. In the transverse slits 45 can be also entspre¬ accordingly flat-shaped leg 47 of a U-shaped holder 48 push. By means of the holder 48 can be held in position 38, the tibial form-part in order to then tion through the borings 41 through means of the bone milling cutter 42, the tibial Dombohrung form. The milling section of the bone cutter

42, as shown in FIG. 10 reveals, characterized and with cone-like pointed ausgebil¬ det the reference point 49.

The impact force of the striking surface 39 of the percussion device

be transferred to the tibial member 38 form 43, the distal end of the impact device 43 to a protruding nose 50th This nose 50 is plugged tibial mold part 38 on to the top thereof. Thus, the impact from the impact surface 39 through the shaft and said nose 50 of the impact device 42 is transmitted to the tibia molding 38th

In Fig. 2 is even with the words "rear" and "front", the rear and front side of the knee joint shown. It will also be appreciated that the radius of the "rear" part of the convex sliding surfaces 17, 18 of the femur slide 16 is smaller than the radius of the "front" portion of the mentioned sliding or friction bearing surfaces. For this reason, it is for the kinematics forward geous when the spherical shell-shaped bearing surface 20 of the

Tibia part rearwardly inclined downward so as Fig. 2 shows.

are all disclosed in the application documents as essential to the invention claimed, as far as they ein¬ individually or in combination over the prior art are new.

Claims

claims
1. knee endoprosthesis with
- a femoral component (10),
- a tibial component (11), and
- arranged between the femoral and tibial part bearing body (12) made of plastic, particularly polyethylene, wherein the bearing body (12) at a the femur part (10) facing the spherical shell-shaped bearing surface (20) of the tibia part (11) is gleitlagernd supported, characterized in that on the tibial bearing surface (20) (21; 26), a stop projecting, in a slot-like opening (22; 25) on the tibia bearing surface (20) facing the supporting and sliding surface (32) of the bearing body (12) occurs, so that the bearing body (12) on the tibial bearing surface (20) to a limited extent is both rotatable as in knee flexion plane longitudinally displaceable, and in that the geometrical central longitudinal axis (51) of the spherical shell-shaped bearing surface (20) of the tibia part (11) relative to the central longitudinal axis (37) of the stretched knee joint endoprosthesis is inclined rearwardly, gene so that the spherical-shell-shaped bearing surface (20) in the implanted state corresponding to the rear below is isplays.
2. A knee-joint endoprosthesis according to claim 1, characterized in that the stop for the Lager¬ body (12) by a in the tibia bearing surface (20) can be screwed or can be screwed onto a located on the tibial bearing surface threaded pin head screw (26) is formed, the head (29) (20) holds the bearing body (12) on the tibial bearing surface.
3. A knee-joint endoprosthesis according to claim 2, characterized in that the slot-like Öff- to voltage (22) in the bearing body (12) to form a slot-like passage (25) extends through this hindurcher¬ so that upon passage of the head bolt (26) the head (29) on the upper side of the bearing body (12), in particular a countersunk relative to the top of the Lager¬ body (12) disposed edge (30) of one of the slot-like opening corresponding upper recess (35) is applied.
4. A knee-joint endoprosthesis is curved according to claim 3, characterized in that the bearing surface of the Schrau¬ benkopfes (29) in the longitudinal direction of the slot-like passage (25) similarly as the concave tibial bearing surface (20).
5. A knee-joint endoprosthesis according to claim 2, characterized in that the screw head (29) inside the bearing body (12) that is within a parallel 'to the slot-like opening (22) extending transverse slot is placed.
6. A knee-joint endoprosthesis according to claim 5, characterized in that the tibia bearing surface (20) nearer the screw head contact surface of the transverse slot is curved in the longitudinal direction thereof both concavely as the tibial bearing surface (20).
7. A knee-joint endoprosthesis according to one of claims 2 to
6, characterized in that the preferably peg-like or pin-like stop (21) or the screw head
(26) made of titanium or a titanium alloy.
8. A knee-joint endoprosthesis according to one of claims 2 to
7, characterized in that the screw head (29) is designed in the manner of a mushroom or a lens.
9. A knee-joint endoprosthesis connects to one of claims 3 to 8, characterized in that at which the spherical-shell-shaped bearing surface (20) of the tibia part (11) side facing away from a shaft or mandrel (15), whose geometrical central longitudinal axis with the geometric longitudinal center axis (51) the kugelschalen¬ shaped bearing surface (20) encloses an acute angle corresponding to the angle of inclination (α) of the kugelschalen¬ shaped bearing surface (20) in the implanted state, wherein the inclination angle (α) is between about 5 ° and 15 °, in particular about 10 °.
10. Knee joint endoprosthesis according to claim 9, characterized in that the tibial punch (15) relative to the central longitudinal axis offset (51) of the spherical shell-shaped bearing surface (20) of the tibia part (11) forwards.
11. A knee-joint endoprosthesis according to one of claims 1 to 10, characterized in that the tibial bearing surface
(20) is asymmetrically formed in plan view.
12. A knee-joint endoprosthesis according to one of claims 1 to 11, characterized in that the tibial "bearing surface (20) is formed by a kugelschalenformig shaped plate whose thickness is about 1.0 to 2.0 mm.
13 instrument to prepare the tibia for implantation of the tibial component according to one of claims 1 to 12, in particular claim 12, characterized by a percussion device (43) having a distal tibial mold part (38) and a proximal face (39), wherein the distal tibia-shaped part (38) has a convex molding surface (40) corresponding concave molding of the proximal end of the tibia.
14. An instrument according to claim 13, characterized in that the tibia forming member (38) is demountable and comprises a bore (41) for guiding a bur (42) with which the tibial mandrel bore to in exact association with the bearing surface (20) of the implanting the tibial part (11) can be produced.
EP19950904493 1993-12-30 1994-12-16 Knee endoprosthesis Withdrawn EP0689406A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE4345032 1993-12-30
DE4345032 1993-12-30
PCT/EP1994/004194 WO1995017860A1 (en) 1993-12-30 1994-12-16 Knee endoprosthesis

Publications (1)

Publication Number Publication Date
EP0689406A1 true true EP0689406A1 (en) 1996-01-03

Family

ID=6506556

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950904493 Withdrawn EP0689406A1 (en) 1993-12-30 1994-12-16 Knee endoprosthesis

Country Status (4)

Country Link
US (1) US5755802A (en)
EP (1) EP0689406A1 (en)
JP (1) JPH08507245A (en)
WO (1) WO1995017860A1 (en)

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US5755802A (en) 1998-05-26 grant
JPH08507245A (en) 1996-08-06 application

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