DE202009012704U1 - Knee endoprosthesis - Google Patents

Abstract

A knee joint endoprosthesis (10) having a femoral component (14) and a meniscal component (16) mounted relative thereto and movably, the femoral component (14) comprising a medial and a lateral condyle (32, 34) comprising a medial and a lateral condylar surface (16). 36, 38), which meniscus part (16) has a medial and a lateral articular surface (50, 60) against which the medial and lateral condylar surfaces (36, 38) abut at least partially, the medial condyle (32) and the medial Articular surface (50) are formed to form a rotational joint (56) with a rotational joint center (52), characterized in that a rolling movement guide means (62) is provided for defined unrolling of the lateral Kondylenfläche (38) and the lateral joint surface (60) along one another defined as a function of a flexion angle (68) between the femoral component (14) and the meniscal component (16), curved around the center of rotation of the joint (52) en train (72).

Description

The The present invention relates to a knee joint endoprosthesis having a Femal judgment and a relative to and stored on this movable Meniscus part, which femoral part medial and lateral condyle comprises, which have a medial and a lateral Kondylenfläche, which meniscus part has a medial and a lateral articular surface, at which the medial and lateral surfaces of the condyles are at least partially in contact, whereby the medial condyle and the medial articular surface are shaped are for forming a rotational joint with a rotational joint center.

knee joint endoprostheses The type described above are based on their structure on a healthy knee joint. Such moves during the Knee flexion, also referred to as flexion, on the lateral side more posterior than on the medial side and allows through the axial rotation generated thereby during flexion of the knee joint an optimal leadership the patella through the trochlea. The location of the trochlea to the patella has a very strong influence on an optimal force deflection, in particular on the stretchability. Therefore, it is known knee joint endoprostheses described above Art in the form of uncoupled, bicondylar knee implants with one - on the tibia or attached to a tibial component fixed to the tibia Meniscus component which form a loose axial Rotation possibility of Tibia to the femur allow.

at a bad band situation or partially missing crossbands by the known implant construction a posterior displacement the femoral component forced, at least on the lateral side. In this way the femur comes in contact with a flexion later Meniscus part made in particular of polyethylene (PE) is, respectively, with the tibial component, so theoretically in this way a larger diffraction or flexion angle between tibia and femur or their longitudinal axes can be realized. Posterior translation usually becomes by the interaction of a projection ("post") and a corresponding one Cam ("cam") between the femoral part and the meniscus part or via a third condyle. However, this allows a perfect alignment of the trochlea, as with the natural, healthy knee joint is the case, not realized.

It is therefore particularly an object of the present invention, a knee joint endoprosthesis of the type described above so too improve that flexion of the knee joint is improved to an optimal leadership to allow the patella through the trochlea and so the physiological kinematics of the healthy knee joint.

These Task is in a knee joint endoprosthesis described above Type according to the invention thereby solved, that a rolling motion guide device is provided for the defined unrolling of the lateral Kondylenfläche and the lateral articular surface along each other one in dependence defined a flexion angle between the femoral component and the meniscal component, around the center of rotation center running, curved track.

The proposed according to the invention Knee joint endoprosthesis allows a force-guided off-center Rotation of the formed by the knee joint endoprosthesis artificial Knee joint at a diffraction of the same. Medialseitig allows the Knee joint endoprosthesis rotation about the center of rotation joint, on the lateral side, by means of the rolling motion guiding device during the Flexion of the knee joint, starting, for example, from the extension of the leg of the patient, no sliding movement between the femur part and the meniscus part admitted, but a rolling motion with the Effect, that at the same time lateral condyle of a femur something in the posterior direction moves longitudinally the curved track running around the center of rotation. The rotation of the knee joint is thus automatically forcibly guided and not initiated by any existing soft tissue. With the proposed Knee endoprosthesis leaves thus a force-guided Create rotation in the leg axis when moving through the joint and associated with it improves the patella in the now anatomical lead aligned trochlea. Another advantage is the increase the power of the leg mechanics conditioned by the now possible optimal patella, So an improved quadriceps performance. Patellar complications especially a subluxation or dislocation associated with pain and joint failure are reduced by the improved patellar guidance. Characterized in that on the above-described projection / cam mechanism ("Post / cam") for forced guidance of the Femur dispensed relative to the tibia posteriorly due to flexion can be, the meniscus part has a much longer life on. Furthermore, the risk of breakage or heavy wear of - not existing - projection Completely eliminated. Furthermore you can Total size of the meniscus part reduced and thus also the surgical technique can be simplified. moreover a more individualized care of the respective patient is possible.

It is advantageous if the rotational joint center is designed in the form of a joint center that is stationary relative to the femoral component and the meniscal component. Such a stationary joint center leaves to train in a simple way. In addition, the knee joint can also be better stabilized in the case of a very weak or degenerated ligaments.

Preferably the rotary joint is designed in the form of a ball joint. A ball joint allows in a simple way, in particular the formation of a stationary Joint center.

Of the Construction of the knee joint endoprosthesis becomes particularly easy when the medial condyle area a spherical condylar area and if the medial articular surface one to the medial condylar surface corresponding hollow spherical joint surface area comprises. The globular Kondylenflächenbereich can thus directly in or on the hollow-spherical joint surface area are stored, with their radii of curvature preferably adapted to each other so that a relative Defined to the femoral part and the meniscus part fixed joint center becomes.

Advantageous it is when the stationary joint center is designed in such a way that it exclusively a sliding movement of the femoral component and the meniscal component relative allows each other. In this way, the femoral component is prevented from becoming relative to the femoral component Meniscus part as a result of flexion of the knee joint in posterior Can move direction.

According to one another preferred embodiment The invention may further be provided that the rotation joint center in the form of a relative to the femoral component and the meniscal component along a dependent on a flexion angle between femoral component and meniscal component of anterior migratory to the posteriorly running rotational joint center Joint center is formed. The migratory joint center allows in particular as a result of flexion of the knee joint movement of the femoral component Medial side slightly in the posterior direction as a result of a diffraction of the knee joint. This may be a translational sliding and / or rolling movement of the femoral component and the meniscal component together act.

advantageously, the knee joint endoprosthesis is designed such that the rotational joint center web runs straight or pointing away from the meniscal component in the medial direction concave curved is. By appropriate design of the medial Kondylenfläche and the medial articular surface let yourself pretend the rotation joint center path, for example by accordingly curved medial condylar surface areas and a corresponding medial articular surface area of the meniscal component.

On particularly simple way Form a migrating joint center when a radius of curvature the medial articular surface is larger as a radius of curvature the medial condyle area. These are preferably those areas, along those the femoral part and the meniscus part abut each other when the knee joint is bent, that is, at a flexion or a corresponding extension, which is also called extension or extension movement. In this way, there is a movement of the medial condyle of the femur relative to the medial articular surface of the meniscal component during a flexion movement in the posterior direction allows. In this case, the meniscal part and the femoral part are preferably designed such that that exclusively a sliding movement between the medial condyle and the medial articular surface is made possible.

Cheap is it, when the migrating joint center is formed such that it was a superimposed one Sliding / rolling movement of the femoral component and the meniscal component relative allows each other. Thus, at least partially also medialseitig a defined Translational movement of the femoral component relative to the meniscal component in As a result of flexion movement of the knee can be achieved.

Around in a simple way a forced guidance to Specification of a rolling movement of the lateral condyle and the lateral articular surface to enable relative to each other it is advantageous if the Abrollbewegungsführungseinrichtung with each other comprising cooperating first and second guide elements, which at the femoral part and the meniscal part are designed to define one in dependence a flexion angle between femoral component and meniscal component of anterior posteriorly and vice versa around the center of rotation of the contact surface. Through the first and second guide elements becomes a sliding movement between the lateral condyle and the lateral articular surface Completely or essentially completely prevented. Analogous to the meshing of one another's teeth Gear and a rack so a rolling motion of the knee joint laterally through the guide elements enforced. However, the first and second guide elements can also be designed such that no exclusive rolling movement enforced, but also, in particular, to a limited extent, a sliding movement on the lateral side is possible.

For a particularly optimized guidance of the patella in the trochlea, it is advantageous if the rolling-motion guiding device is designed to allow only a rolling movement between the lateral condylar surface and the lateral joint surface. As already stated, this can be achieved in particular by in that the first and second guide elements are designed to engage in one another in such a way that, similar to the intermeshing of teeth of a toothed wheel and a toothed rack, they do not allow the parts to slide relative to one another.

On In a particularly simple way, the guide elements can be formed, if the femoral part at least a first and if the meniscus part at least a second guide element comprising at least a first and a second guide elements define at least partially abutting first and second guide element surfaces. Force the abutting first and second guide element surfaces as a result of a movement of the knee joint, so for example at a flexion or extension, a lateral rolling movement of the femoral part and the meniscal part relative to each other.

Advantageous if it is, the first guide element surface at least has a pointing in the direction of the meniscus part concave surface area. As a result, for example, a corresponding convex surface area of the meniscal component into the concave surface area of the femoral component at the desired Rolling movement in consequence of a flexion of the knee joint intervene.

Around one possible good leadership or interlocking between the femoral component and the meniscal component Achieving a lateral rolling motion is to achieve it cheap, if the first guide element surface two or more, each concave by a convex surface area surface areas having. these can relative to each other in a row, which is rectilinear or curved can be, one behind the other or even partially next to each other or offset from each other next to each other and arranged one behind the other be.

In order to the first and second guide element surfaces can interact easily, is it cheap if the second guide element surface at least a convex surface area pointing towards the femur having. The convex surface area in particular can take up a concave area of the femoral part, relative to a rolling movement of the femoral component and the meniscal component to enforce each other.

Around possibly over one huge Area to specify a defined rolling motion is it cheap, if the second guide element surface two or more, each separated by a concave area convex Has surface areas.

A especially small size of the meniscus part let yourself achieve, in particular, the first and second guide elements formed in the region of the lateral articular surface and the lateral Kondylenfläche are. In particular, you can the first and second guide elements into the lateral articular surface or integrated into the lateral Kondylenfläche and respectively one piece be formed with these. This can be a guide directly in the areas be reached, where the femoral component and the meniscal component lateral in contact with each other.

Preferably have the first and second guide elements first and second guide element surfaces, which at least partially the lateral articular surface and form the lateral condylar surface. This allows the femoral component and the meniscal component to be joined together lead in the areas in which they are in contact with each other.

advantageously, indicates the lateral condylar surface at least one pointing in the direction of the meniscus part concave area on. Such a concave surface area let yourself for example, in the form of a depression of the otherwise preferably predominantly pointing away from the femur, forming a convexly curved femoral articular surface. In the recess or recess, a corresponding, convex facing away from the meniscus part protruding projection or an increase intervene and so with a flexion of the knee joint from an extended position cause a forced rolling movement in any bending position.

According to one another preferred embodiment The invention may be provided that the lateral Kondylenfläche two or more, each concave by a convex surface area surface areas having. So lets In a simple way, a two- or multi-toothed teeth between the Make the femoral part and the meniscus part a rolling motion as a result of a flexion movement of the knee joint to force. there It should be noted that the interlocking projections and Recesses defining convex and concave areas differ shaped or else, as in a connection between one Gear and a rack, can be shaped identically.

In order to further simplify and optimize the interaction of the first and second guide elements, it is favorable if the lateral articular surface has at least one convex surface area pointing in the direction of the femur part. The convex surface area, which can form, for example, a part of an outer surface of a projection, can thus easily in a corresponding recess with concave Intervene surface area of the femur judgment.

One optimized interaction of the first and second guide elements is especially possible if the lateral articular surface two or more, each separated by a concave area convex surface areas having.

In principle, it would be conceivable fix the meniscal part directly to the tibia. If necessary the replacement of the meniscus part as a result of wear or a damage To facilitate, it is advantageous if the knee joint endoprosthesis further comprises a tibial component carrying the meniscal component. The tibia part so first anchored in a tibia of a patient, for example by cementing or screwing, and then with be connected to the meniscus part.

at a plurality of knee joint endoprostheses is provided, the meniscus part and the tibialis movable to store each other. According to a preferred embodiment However, it is favorable for the present invention if the meniscus part and the tibia part are immovably connected. To this Way the meniscus part in a defined manner relative to the tibia of the patient. The most physiological reconstruction possible allow a knee joint trained femoral and meniscal parts in the manner described above an at least partially enforced Rolling movement on each other laterally as a result of a flexion movement of the knee.

Especially The femur judgment can be trained in a simple and compact way the meniscal component, if the femoral component except the lateral and the medial Condyle does not include another condyle. The meniscus part comprises then exclusively a lateral and a medial condyle. Furthermore, at the Knee joint endoprosthesis preferably no projection in the form of a Post ("post") or The like provided on the meniscus part and / or on the tibia part, the to the leadership of the meniscal component and the femoral component during a flexion movement of the knee interact. In this way, the size of the meniscus part can be easy and safe to minimize.

The Knee endoprosthesis leaves produce in a simple way and also increase their stability, if the femoral component and / or the meniscal component and / or the tibial component, respectively one piece are formed. In particular, you can the femoral component and the tibial component of an implant material, for example an implant steel or titanium, be formed, the meniscus part made of an abrasion-resistant plastic, for example polyethylene or High density polyethylene with high molecular weight.

According to one another preferred embodiment The invention may be advantageous if the femoral component and / or the tibia part are designed in the form of modular prosthesis parts. Both the femoral part and the tibia part are so individual adapt to the physiology of the patient. For example can Both the femoral component and the tibial component have shafts that are in corresponding wells used by the femur and tibia and can be fixed therein, for example using bone cement or bone screws. The shafts can also solvable connectable with other components of the femur or be connectable to the tibial component, so that if necessary, the femoral component and the tibial component individually by an operator while still surgical Assemble surgery to ensure the best possible adaptation of the knee joint endoprosthesis to allow for the physiology of the patient.

Basically it would be true conceivable, the femoral part and the meniscus part of identical materials manufacture. To a friction and thereby wear through To minimize abrasion, it is cheap if the femoral part and the meniscus part are made of different materials are made. conveniently, The femoral component and the tibial component are made of identical materials produced. It is advantageous if the femur part of a more abrasion-resistant material is made than the meniscus part. On that way a wear of the Relocate knee joint endoprosthesis to the part, which may be easier can be exchanged.

The following description of preferred embodiments of the invention used in conjunction with the drawings for further explanation. Show it:

1 an anterior plan view of an implanted knee joint endoprosthesis with the knee joint extended;

2 : An anterior exploded perspective view of the femoral component and the meniscal component of the knee joint endoprosthesis 1 from above;

3 : a posterior perspective view analog 2 from underneath;

4 : a medial side view of the two in the 2 and 3 represented parts of the knee joint endoprosthesis;

5 : a lateral view analogous to 4;

6 : A perspective view of the femoral component and the meniscal component in an inflectional position development of about 90 °; and

7 : an anterior-lateral view analogous 6 ,

In 1 is a total with the reference number 10 designated knee joint endoprosthesis shown. It includes a on a femur 12 fixable, bicondylar femoral part 14 and a relative to and on this movably mounted meniscus part 16 ,

The meniscus part 16 Optionally, directly with a partially resected tibia 18 a patient, for example by screwing or cementing, or alternatively at an in 2 dashed tibia part 20 the knee joint endoprosthesis 10 be fixed immovable.

The tibia part 20 includes a plate 22 and a substantially transversely projecting from this shaft 24 in a suitably shaped cavity 26 the tibia 18 is fixed, for example by means of bone cement or bone screws, not shown. The meniscus part 16 is immovable by means of a connecting device, not shown on the tibia part 20 established. The connecting device can be designed in particular in the form of a latching or snap connection with interlocking latching or snap elements, which are connected to the plate 22 and at a bottom 28 , which is otherwise formed just trained to be. Alternatively, the connecting device may also comprise fastening elements, for example screws, with which the meniscal component is immovable on the tibial component 20 can be determined.

The femur judgment 14 , as well as the meniscus part 16 , is related to a sagittal plane 30 formed asymmetrically and comprises two condyles, namely a medial condyle 32 and a lateral condyle 34 , which has a medial condylar surface 36 and a lateral condylar surface 38 exhibit. The condylar surfaces 36 and 38 show from the femur judgment 14 away towards the meniscus part 16 out.

The condyles 32 and 34 are spaced apart in the lateral-medial direction and at their anterior ends via a connecting element 40 integrally connected. From the meniscus part 16 away facing contact surfaces 42a . 42b . 42c . 42d and 42e for applying the meniscal component to a correspondingly prepared femur 12 are each inclined by 45 ° relative to each other. In the contact areas 42b and 42c is a first recess 44a formed in each of the contact surfaces 42b and 42c has a constant depth, but not over the entire, of the two plant surfaces 42b and 42c defined area extends. Another recess 44b is starting from the contact surfaces 42d and 42e in the condyles 32 and 34 educated. The contact surfaces 42a to 42e in connection with the recesses 44a and 44b the two condyles 32 and 34 serve to the femur judgment 14 at a previously corresponding to one of the contact surfaces 42a to 42e predetermined inner contour of the femoral part 14 to fix partially-resolved femur, preferably with bone cement.

The condylar surfaces 36 and 38 are shaped differently. The medial condylar surface 36 has a spherical Kondylenflächenbereich 46 on which of the femdom 14 pointing away and curved exclusively convex. A radius of curvature of the spherical condylar surface area 46 is slightly smaller than a hollow-spherical articular surface area 48 a medial articular surface 50 of the meniscal component 16 at which the medial condylar surface 36 with the spherical condylar surface area 46 partially applied. Optionally, the radii of curvature of the spherical condylar surface area 46 and the hollow spherical articular surface area 48 also be formed identically, so that a rotational joint center 52 a ball joint is defined. The rotational joint center 52 may be in the form of a fixed hinge center when the radius of the spherical condylar surface area 46 and the hollow spherical articular surface area 48 are identical. Is the tub-shaped, hollow-spherical articular surface area 48 less curved than the spherical condylar surface area 46 , the rotational joint center can 52 along a rotational joint center track 54 From a maximum anterior position with the knee joint extended, move in the posterior direction to a maximum posterior end position in which the knee joint is maximally bent. Overall, the medial condyle forms 32 with the medial articular surface then also a rotation joint 56 out.

The medial articular surface 50 forms part of a top 58 of the meniscal component 16 , which further comprises a lateral articular surface 60 which cooperates with the lateral condylar surface 38 is formed in the manner described below.

As mentioned above, knee joint endoprostheses with an off-center rotary joint 52 as described above. As a result of a flexion of the knee joint a defined unrolling, preferably only the lateral condyle 34 and the lateral articular surface 60 To reach, includes the knee joint endoprosthesis 10 a rolling motion guide device 62 , It serves to force a defined rolling movement of the lateral Kondylenfläche 38 and the lateral articular surface 60 along one another depending on a flexion angle 68 of the knee joint, ie between a longitudinal axis 64 of the femur and a longitudinal axis 66 the tibia, defined around the rotational joint center 52 extending curved track 72 , As a result, a lateral joint center 70 as a result of bending along a path 72 migrates in the posterior direction. Is it the joint center 52 around a fixed joint center, then the path runs 72 around the fixed joint center 52 , This results from the fact that the rotary joint 56 in this case is a ball joint.

The forced rolling movement is due to the special design of the rolling motion guide device 62 achieved, which corresponds in principle in construction a gear and a rack, which are moved relative to each other. First guide elements 74 correspond to teeth of a gear and second guide elements 76 on the meniscus part 16 Teeth of the rack. The first and second guide elements 74 and 76 are in the form of depressions 78 and 80 as well as increases 82 and 84 on the meniscus part 16 such as 86 and 88 at the femdom 14 educated. They are arranged such that the elevations 82 . 84 . 86 and 88 bending the knee into the correspondingly shaped depressions 78 and 80 plunge. Due to the special design of the wells 78 and 80 as well as the raises 82 . 84 . 86 and 88 As a result, a toothing is achieved, which is a sliding movement of the knee joint endoprosthesis 10 lateral, ie between the lateral condylar surface 38 and the lateral articular surface 60 avoided. The first and second guide elements 74 and 76 are also preferably concentric with the rotational joint center 52 formed so that medial side rotation around the rotational joint center 52 and on the lateral side a superimposed rotational / rolling movement about the rotation joint center 52 enforced. The joint center migrates 70 , which is essentially due to the lateral condyle 34 is defined along the path 72 with increasing flexion angle 68 in the direction of the arrow 90 in the posterior direction.

At a migratory center of rotation 52 runs the Rotationsgelenkzentrumsbahn 54 depending on the design of the medial articular surface 50 and the associated medial condylar surface 36 either straight or from the meniscus part 16 pointing away in the medial direction convexly curved.

Analogously, a contact surface area also migrates 92 in the posterior direction, with the contact surface area 92 is defined by the adjoining lateral Kondylenfläche 38 and lateral articular surface 60 ,

For the leadership of the femdom 14 and the meniscus part 16 relative to each other define the first and second guide elements 72 and 74 first guide element surfaces 94 and second guide element surfaces 96 , The first guide element surface 94 has at least one concave surface area 98 on, by convex surface areas 100 are limited laterally. In an analogous manner, the second guide element surface 96 at least one, preferably two in the direction of the femur part 14 pointing convex surface areas 102 preferably through a concave surface area 104 are separated from each other.

The first and second guide elements 74 . 76 are in the area of the lateral articular surface 60 and the lateral condylar surface 38 formed, resulting in a particularly small size of the meniscal component 16 results. They thus at least partially form the lateral articular surface 60 and the lateral condylar surface 38 ,

The femur judgment 14 and the tibia part 20 may optionally be in the form of modular prosthesis parts, which may be composed of several, interconnected and possibly interchangeable parts.

The implant design described, which when moving the leg forcibly guided axial rotation about the off-center rotational joint center 52 , optionally also medial superimposed with a posterior translation, generated and thus allows a defined alignment of the trochlea contributes significantly to maintain the physiological kinematics of the knee joint. There are no further guiding elements between the tibia part 20 and the femdom 14 , known for example in the form of protrusions and ent speaking cam, even more condyles on the femur, so in particular no third condyle required.

The femur judgment 14 and the tibia part 20 are preferably made of an instrument steel or titanium or a titanium alloy, the meniscus part 16 preferably made of an abrasion-resistant plastic, for example polyethylene (PE).

Claims (28)

Knee joint endoprosthesis ( 10 ) with a femur ( 14 ) and a relative to and on this movably mounted meniscus part ( 16 ), which femdom ( 14 ) a medial and a lateral condyle ( 32 . 34 ), which has a medial and a lateral condylar surface ( 36 . 38 ), which meniscus part ( 16 ) a medial and a lateral articular surface ( 50 . 60 ), on which the medial and lateral condylar surfaces ( 36 . 38 ) at least partially, the medial condyle ( 32 ) and the medial articular surface ( 50 ) are shaped to form a rotational joint ( 56 ) with a rotational joint center ( 52 ), characterized in that a rolling motion guide direction ( 62 ) is provided for defined unrolling of the lateral Kondylenfläche ( 38 ) and the lateral articular surface ( 60 ) along one another as a function of a flexion angle ( 68 ) between females ( 14 ) and meniscus part ( 16 ) to the rotational joint center ( 52 ), curved track ( 72 ). Knee joint endoprosthesis according to claim 1, characterized in that the rotational joint center ( 52 ) in the form of a relative to the femur ( 14 ) and to the meniscus part ( 16 ) fixed joint center ( 52 ) is trained. Knee joint endoprosthesis according to claim 1 or 2, characterized in that the rotary joint ( 56 ) in the form of a ball joint ( 56 ) is trained. Knee joint endoprosthesis according to claim 3, characterized in that the medial condylar surface ( 36 ) a spherical condylar area ( 46 ) and that the medial articular surface ( 50 ) one to medial Kondy lenfläche ( 36 ) corresponding hollow spherical articular surface area ( 48 ). Knee joint endoprosthesis according to one of claims 2 to 4, characterized in that the stationary joint center ( 52 ) is designed such that it only a sliding movement of the femoral component ( 14 ) and the meniscus part ( 16 ) relative to each other. Knee joint endoprosthesis according to claim 1, characterized in that the rotational joint center ( 52 ) in the form of a relative to the femur ( 14 ) and to the meniscus part ( 16 ) along a function of a flexion angle ( 68 ) between females ( 14 ) and meniscus part ( 16 ) of anterior to posterior rotary joint center track (FIG. 54 ) migratory joint center ( 52 ) is trained. Knee joint endoprosthesis according to claim 6, characterized in that the rotational joint center web ( 54 ) runs in a straight line or from the meniscus part ( 16 ) in the medial direction pointing away convexly curved. Knee joint endoprosthesis according to claim 6 or 7, characterized in that a radius of curvature of the medial articular surface ( 50 ) is greater than a radius of curvature of the medial condylar surface ( 36 ). Knee joint endoprosthesis according to one of claims 6 to 8, characterized in that the migrating joint center ( 52 ) is designed such that it has a superimposed sliding / rolling movement of the femur part ( 14 ) and the meniscus part ( 16 ) relative to each other. Knee joint endoprosthesis according to one of the preceding claims, characterized in that the rolling-motion guiding device ( 62 ) cooperating with each other first and second guide elements ( 74 . 76 ), which at the femur ( 14 ) and on the meniscus part ( 16 ) are designed to define a function of a flexion angle ( 68 ) between females ( 14 ) and meniscus part ( 16 ) from anterior to posterior and vice versa around the rotational joint center ( 52 ) migrating contact surface area ( 92 ). Knee joint endoprosthesis according to one of the preceding claims, characterized in that the rolling-motion guiding device ( 62 ) is designed to exclusively a rolling movement between the lateral Kondylenfläche ( 38 ) and the lateral articular surface ( 60 ). Knee joint endoprosthesis according to claim 10 or 11, characterized in that the femur part ( 14 ) at least a first and that the meniscus part ( 16 ) at least one second guide element ( 74 . 76 ) comprising at least a first and second guide elements ( 74 . 76 ) at least partially abutting first and second guide element surfaces ( 94 . 96 ) define. Knee joint endoprosthesis according to claim 12, characterized in that the first guide element surface ( 94 ) at least one towards the meniscal component ( 16 ) pointing concave area ( 98 ) having. Knee joint endoprosthesis according to claim 13, characterized in that the first guide element surface ( 94 ) two or more, each by a convex surface area ( 100 ) separate concave areas ( 98 ) having. Knee joint endoprosthesis according to one of claims 12 to 14, characterized in that the second guide element surface ( 96 ) at least one in the direction of the femur ( 14 ) convex surface area ( 102 ) having. Knee joint endoprosthesis according to claim 15, characterized in that the second guide element surface ( 96 ) two or more, each by a concave surface area ( 104 ) separate convex surface areas ( 102 ) having. Knee joint endoprosthesis according to one of claims 12 to 16, characterized in that the first and second guide elements ( 74 . 76 ) in the area of the lateral articular surface ( 60 ) and the lateral condylar surface ( 38 ) are formed. Knee joint endoprosthesis according to one of claims 12 to 17, characterized in that the first and second guide elements ( 74 . 76 ) first and second guide element surfaces ( 94 . 96 ), which at least partially the lateral articular surface ( 60 ) and the lateral condylar surface ( 38 ) form. Knee joint endoprosthesis according to one of the preceding claims, characterized in that the lateral Kondylenfläche ( 38 ) at least one towards the meniscal component ( 16 ) pointing concave area ( 98 ) having. Knee joint endoprosthesis according to claim 19, characterized in that the lateral Kondylenfläche ( 38 ) two or more, each by a convex surface area ( 100 ) separate concave areas ( 98 ) having. Knee joint endoprosthesis according to one of the preceding claims, characterized in that the lateral joint surface ( 60 ) at least one in the direction of the femur ( 14 ) convex surface area ( 102 ) having. Knee joint endoprosthesis according to claim 21, characterized in that the lateral articular surface ( 60 ) two or more, each by a concave surface area ( 104 ) separate convex surface areas ( 102 ) having. Knee joint endoprosthesis according to one of the preceding claims, characterized by the meniscal component ( 16 ) supporting tibial component ( 20 ). Knee joint endoprosthesis according to claim 23, characterized in that the meniscal component ( 16 ) and the tibial component ( 20 ) are immovably connected. Knee joint endoprosthesis according to one of the preceding claims, characterized in that the femoral component ( 14 ) except the lateral and medial condyle ( 32 . 34 ) does not include any other condyle. Knee joint endoprosthesis according to one of the preceding claims, characterized in that the femoral component ( 14 ) and / or the meniscal component ( 16 ) and / or the tibial component ( 20 ) are integrally formed. Knee joint endoprosthesis according to one of the preceding claims, characterized in that the femoral component ( 14 ) and / or the tibial component ( 20 ) are designed in the form of modular prosthesis parts. Knee joint endoprosthesis according to one of the preceding claims, characterized in that the femoral component ( 14 ) and the meniscus part ( 16 ) are made of different materials.