CN209678762U - Knee-joint prosthesis and knee-joint prosthesis component - Google Patents

Abstract

The utility model provides a kind of knee-joint prosthesis and knee-joint prosthesis component.Knee-joint prosthesis includes tibial, liner and femoral component.One or more fins that tibial includes platform and upwardly extended by the upper surface of platform and extended forward by the rear portion of platform, the leading edge of the upper surface of platform are provided at least one front boss, and the rear of the upper surface of platform is provided at least one rear boss.The lower surface of liner have the groove to match with fin, with the matched preceding grooving of front boss and with rear boss it is matched after grooving.The connection of the upper surface joint of femoral component and liner.Wherein, at least one fin has inner sidewall and lateral wall, and on extending direction forward, wherein one side wall has bending place and forms the first inclined-plane for inner sidewall and lateral wall, and first tiltedly extends away from the direction of wherein another side wall.

Description

Knee-joint prosthesis and knee-joint prosthesis component

Technical field

The utility model relates generally to a kind of implantable orthopedic prosthesis, it particularly relates to which a kind of knee joint is false Body and knee-joint prosthesis component.

Background technique

The theory of knee-joint prosthesis design is generally basede on identity principle, i.e., is provided and be similar to just with the knee joint element of implantation Normal kneed biomechanical movement mode, and by implantation material itself and knee ligament and soft tissue balance obtain it is static and Dynamic stability.The design of these knee joint elements all attempts the movement by restoring natural human knee joint, and adjustment The strength generated in knee joint flexion and extension with control.But knee-joint prosthesis designs all at present all do not reach this mark It is quasi-.

Traditional knee-joint prosthesis, mainly include in conjunction with femur femoral component, for the shin in conjunction with shin bone Bone component and the liner for being set to tibial upper surface.Wherein, in fixed-bearing knee prosthesis, liner setting After on tibial, opposite slide cannot occur therewith.

In the prior art, the edge contour generally along tibial component platform or center projections form fixing groove to lead To or positioning, before and after liner component by setting Elastic buckle and fixing groove achieve the purpose that it is sealed.

So, in use, Impact direction is mainly front-rear direction relative to patient to knee-joint prosthesis, thus pad by It is greater than the left and right sides to forward shearing force, in this way, liner will appear forward fine motion, and frequent opposite sliding causes Abrasion.Above-mentioned closing component structure in the prior art be easy to cause the contact area stress of liner and shin bone edge contour to concentrate, Locking force is caused to be not enough to offset the shearing force that liner travels forward, so that the fine motion amount of liner is caused to increase, and liner Lower surface serious wear.

Above- mentioned information are only used for reinforcing the understanding to the background of the utility model disclosed in the background technology part, because This it may include the information not constituted to the prior art known to persons of ordinary skill in the art.

Utility model content

One main purpose of the utility model is to overcome at least one defect of the above-mentioned prior art, provides one kind and subtract The knee-joint prosthesis of fine motion is padded less.

Another main purpose of the utility model is to overcome at least one defect of the above-mentioned prior art, provides one kind Knee-joint prosthesis component.

To realize above-mentioned purpose of utility model, the utility model adopts the following technical solution:

One aspect according to the present utility model provides a kind of knee-joint prosthesis, including tibial, liner and stock Bone component.Tibial includes platform and is upwardly extended by the upper surface of the platform and prolonged forward by the rear portion of the platform The one or more fins stretched, the leading edge of the upper surface of the platform are provided at least one front boss, the upper table of the platform The rear in face is provided at least one rear boss；The lower surface of the liner has the groove to match with the fin, described Liner has and has and the matched rear grooving of the rear boss with the matched preceding grooving of the front boss, the liner；Femur structure Part is connect with the upper surface joint of the liner；Wherein, at least one described fin has inner sidewall and lateral wall, is prolonging forward It stretches on direction, wherein one side wall has bending place and forms the first inclined-plane for the inner sidewall and the lateral wall, and described first tiltedly Extend away from the direction of wherein another side wall.

The upper surface of an embodiment according to the present utility model, first inclined-plane and the platform forms intersecting lens, Angle between the intersecting lens and the central axes in the front-back direction of the platform is greater than 0 degree.

An embodiment according to the present utility model, the angle are 2 degree of -70 degree.

An embodiment according to the present utility model, the fin are a pair, and a pair of fin is arranged in the platform Middle part, at least one fin and the platform are in axis parallel in the front-back direction or angled.

An embodiment according to the present utility model, the bending place have recess, and the recess is upper from the platform Surface upwardly extends and terminates at the upper surface of the fin.

An embodiment according to the present utility model, another side wall in the inner sidewall and the lateral wall of the fin Without the bending place；Or

Another side wall has the bending in extending direction forward in the inner sidewall and the lateral wall of the fin Place simultaneously forms the second inclined-plane, and second inclined-plane and first inclined-plane are parallel or angled.

An embodiment according to the present utility model, the fin and the groove are interference fitted in width direction.

An embodiment according to the present utility model, the front boss have undercutting before at least one, the rear boss tool It is undercut after having at least one, there is at least one to be caught in the preceding front protrusion undercut and at least one for the lower surface of the liner It is caught in the rear rearward projection undercut.

An embodiment according to the present utility model, at least one described rear undercutting are located in the middle part of the rear of the platform.

Another aspect according to the present utility model provides a kind of knee-joint prosthesis component, including one or more above-mentioned Tibial, multiple above-mentioned liners and multiple femoral components.Each liner is in the of different size of inward-outward direction；It is described Femoral component is connect with the upper surface joint of the liner.

As shown from the above technical solution, it the advantages of the knee-joint prosthesis of the utility model and has the active effect that

Knee-joint prosthesis provided by the utility model, by " inner sidewall and lateral wall of fin wherein one side wall have it is curved At folding and form the first inclined-plane, first tiltedly extends away from the direction of wherein another side wall " structure design so that fin Inner sidewall and/or lateral wall have inclined-plane, and groove also has inclined-plane in corresponding position.When shearing of the liner by forward direction When power, since fin and groove form inclined-plane cooperation, therefore fin and groove be at inclined-plane cooperation it is gapless, fin effectively hinders Hinder liner to move forward, significantly reduces the generation of fine motion between liner and tibial.Meanwhile according to trigonometric function original Reason, the power that the inclined-plane of fin can will pad forward power and be decomposed into a part of non-forward direction, it is forward to effectively reduce liner Shearing force size reduces the trend of liner forward slip.Accordingly, the inclined-plane of fin and groove cooperation effectively hinders liner It moves ahead, so that the fine motion amount of liner weakens, effectively reduces the abrasion of the lower surface of liner.

Detailed description of the invention

Its example embodiment is described in detail by referring to accompanying drawing, above and other feature and advantage of the utility model will It becomes readily apparent from.

Fig. 1 is the exploded view according to the knee-joint prosthesis shown in an illustrative embodiments.

Fig. 2 is the top view according to the tibial shown in an illustrative embodiments.

Fig. 3 is the bottom view according to the liner shown in an illustrative embodiments.

Fig. 4 is the rearview according to tibial and liner assembly shown in an illustrative embodiments.

Fig. 5 is the cross-sectional view in Fig. 4 along line A-A.

Fig. 6 is the cross-sectional view in Fig. 4 along line B-B.

Fig. 7 is the perspective view according to another embodiment of the tibial shown in an illustrative embodiments.

Fig. 8 is the perspective view according to a further embodiment of the tibial shown in an illustrative embodiments.

Wherein, the reference numerals are as follows:

10, tibial

101, leading edge

102, rear

110, platform

111, the upper surface of platform

120, fin

121, inner sidewall

1211, the first inclined-plane

122, lateral wall

123, recess

130, front boss

1301, preceding undercutting

140, rear boss

1401, rear undercutting

20, it pads

201, the upper surface padded

210, groove

220, preceding grooving

2201, front protrusion

230, rear grooving

30, femoral component

Specific embodiment

Example embodiment is described more fully with reference to the drawings.However, example embodiment can be with a variety of shapes Formula is implemented, and is not understood as limited to embodiment set forth herein；On the contrary, thesing embodiments are provided so that this is practical new Type will be full and complete, and the design of example embodiment is comprehensively communicated to those skilled in the art.It is identical in figure Appended drawing reference indicates same or similar structure, thus the detailed description that will omit them.

In the present invention, such as "front", "rear", "upper", "lower", "inner", "outside" direction and knee joint are false Front, rear, top, and bottom, inside and outside direction when body implantation human body is stood with descendant are consistent, and the utility model is with the knee of left knee It is described for articular prosthesis, for example, as shown in Fig. 2, the right side of tibial is inside, the left side of tibial is Outside.

With reference to the accompanying drawing, it elaborates to some embodiments of the utility model, in the absence of conflict, under The feature in embodiment stated can be combined with each other.

Fig. 1 is the exploded view according to the knee-joint prosthesis shown in an illustrative embodiments.Fig. 2 is according to an exemplary reality Apply the top view of the tibial shown in mode.Fig. 3 is the bottom view according to the liner shown in an illustrative embodiments.Fig. 4 It is the rearview according to tibial and liner assembly shown in an illustrative embodiments.Fig. 5 is cuing open along line A-A in Fig. 4 View.Fig. 6 is the cross-sectional view in Fig. 4 along line B-B.Fig. 7 is according to the another of the tibial shown in an illustrative embodiments The perspective view of embodiment.Fig. 8 is the solid according to a further embodiment of the tibial shown in an illustrative embodiments Figure.

As shown in Figure 1, the utility model provides a kind of knee-joint prosthesis comprising tibial 10, liner 20 and Femoral component 30.Wherein, tibial 10 includes platform 110 and is starting point to away from platform 110 using the lower surface of platform 110 The fixing component that lower surface direction extends, such as elongated bar, elongated bar can be implanted into the patient prepared by surgical operation Ligament tibia end (not shown).The upper surfaces that liner 20 can be fixed on tibial 10, for example, fin as described below 120 with The cooperation of groove 210.Femoral component 30 can be implanted into the femur end (not shown) of the patient prepared by surgical operation, and structure Cause to imitate the configuration of the natural condyle of femur of patient.The upper surface 201 of liner 20 includes external side support surfaces and medial support Surface is connect with the external condyle articular surface of femoral component 30 and entocondyle articular surface joint respectively.Certainly, such as this field people Known to member, it can also include patellar components, no longer elaborate herein.

Tibial 10 and femoral component 30 can be made of metals such as cochromes, and it is normal that this field can also be used certainly Other materials.Tibial 10 and the bone engagement surface of femoral component 30 can be textured, are conducive to the knot with bone It closes.It is raw in bone to promote in addition, these bone engagement surfaces also can have porous coating, thus permanently and skeletal fixation.

Liner 20 can be used polymeric material and be made, such as ultra-high molecular weight polyethylene, and but it is not limited to this.

With reference to the accompanying drawing, it elaborates to the structure of tibial 10 and liner 20.

As shown in Figure 1, Figure 2 and Figure 3, tibial 10 includes platform 110 and upward by the upper surface 111 of platform 110 The one or more fins 120 for extending and being extended forward by the rear of platform 110 102.Fin 120 can be and platform 110 1 Body formed, such as pass through Milling Process.The size of platform 110, which can be, tops portion with patient's shin bone by surgical operation Outer contour shape after point matches, so that the lower surface of platform 110 is preferably engaged with the section of patient's shin bone.

In the other embodiments of the utility model, as shown in Figure 7 and Figure 8, one or more fins 120 originate in flat The rear portion of platform 110 and extend forward, is not connected with the rear 102 of platform 110, as long as its work that can play guiding and positioning With.

The quantity of fin 120 can be one, it is two or more.Wherein, at least one fin 120 has inner sidewall 121 With lateral wall 122, on the direction that the fin 120 extends forward, inner sidewall 121 and lateral wall 122 wherein one side wall have it is curved At folding and the first inclined-plane 1211 is formed, the first inclined-plane 1211 extends to the direction far from wherein another side wall.The following table of liner 20 Face has the groove 210 to match with fin 120.

Specifically, it for the ease of following the description, is illustrated so that inner sidewall 121 has bending place as an example.Such as Fig. 2 institute Show, inner sidewall 121 forward and extends inwardly to form the first inclined-plane 1211, the rest part on the first inclined-plane 1211 and inner sidewall 121 Angle is formed, inclined-plane 1211 tilts inwardly on extending direction forward, i.e., far from lateral wall 122.It should be noted that this reality It is the non-bending part far from another side wall with novel " far from another side wall ", if another side wall is prolonging forward Stretching also has bending part on direction, then the inclined-plane far from another side wall can be parallel to even close to another side wall Bending part is formed substantially such asOrShape.In other words, if another side wall is in extending direction forward With bending part, the utility model is not particularly limited to the overbending direction of the bending part, and overbending direction can be outward Or extend inwardly, even as described aboveShape direction extend.It should be understood that above-mentioned a variety of changes Shape, it is within the protection scope of the present utility model.

In addition, the leading edge 101 of the upper surface 111 of platform 110 is provided at least one front boss 130, the upper table of platform 110 The rear 102 in face 111 is provided at least one rear boss 140.Correspondingly, liner 20 have with front boss 130 it is matched before cut Slot 220, liner 20 have and the matched rear grooving 230 of rear boss 140.When liner 20 is fixedly mounted on the platform of tibial 10 When 110 upper surface 111, grooving 220 before front boss 130 can be accommodated in, rear boss 140 can be accommodated in rear grooving 230.

In the present invention, it does not limit the inner sidewall 121 of fin 120 and whether lateral wall 122 has in above-below direction There is inclination.

Knee-joint prosthesis in use, due to when patient's knee joint is bent and stretched Impact direction predominantly relative to patient's Front-rear direction, thus pad 20 be greater than by forward shearing force inside and outside, in this way, liner 20 will appear forward fine motion, And frequently abrasion caused by opposite sliding.Knee-joint prosthesis provided by the utility model passes through the " inner sidewall 121 of fin 120 Wherein one side wall has bending place and forms the first inclined-plane 1211 with lateral wall 122, and the first inclined-plane 1211 is to far from wherein another The structure design of the direction extension of side wall ", so that the inner sidewall 121 and/or lateral wall 122 of fin 120 have inclined-plane, groove 210 also have inclined-plane in corresponding position.When padding 20 shearing force by forward direction, due to fin 120 and groove 210 Form inclined-plane cooperation, thus fin 120 with groove 210 at inclined-plane cooperation be it is gapless, fin 120 effectively hinders liner 20 It moves forward, significantly reduces the generation of fine motion between liner 20 and tibial 10.It is convex meanwhile according to trigonometric function principle The power that the inclined-plane of rib 120 can will pad 20 forward power and be decomposed into a part of non-forward direction, effectively reduces liner 20 forward Shearing force size, reduce liner 20 forward slips trend.Accordingly, the inclined-plane of fin 120 and groove 210 cooperation effectively resistance Hinder moving ahead for liner 20, so that the fine motion amount of liner 20 weakens, effectively reduces the abrasion of the lower surface of liner 20.

Please continue to refer to Fig. 1-Fig. 3, in a preferred embodiment of the utility model, the first inclined-plane 1211 and platform 110 upper surface 111 forms intersecting lens, and the angle between intersecting lens and the central axes in the front-back direction of platform 110 is greater than 0 degree. For example, as shown in Fig. 1 to Fig. 8 angle can be 0 degree of -90 degree, preferably, angle can be 2 degree of -70 degree.In addition, as above-mentioned DescriptionShape, angle is also possible to 90 degree -180 degree.

Please continue to refer to Fig. 1-Fig. 3, in a preferred embodiment of the utility model, the quantity of fin 120 can be The middle part of the upper surface 111 of platform 110 is arranged in a pair, a pair of of fin 120.The setting of two fins 120, so that fin 120 The reaction force for giving liner 20 is more uniform, stable and strong.

In other embodiments, a pair of of fin 120 can be using platform 110 in central axes in the front-back direction as axial symmetry Setting.

It should be understood that two above-mentioned fins 120 can be with roughly the same height, it is also possible to have not Same height.Wherein, term " substantially " to modify it is any can minor change relationship, measurement and assembly when have error, but This error will not change its essence.

Wherein, fin 120 can be with platform 110 in axis parallel in the front-back direction, and fin 120 can also be with platform 110 is angled in central axes in the front-back direction, such as acute angle.Certainly, two fins 120 can be parallel to central axes, can also be with It is angled with central axes, as long as fin can play guiding role in prosthese installation process.

Fig. 4-Fig. 6 is please referred to, in a preferred embodiment of the utility model, the bending place of fin 120 has recess 123, recess 123 upwardly extends from the upper surface of platform 110 111 and terminates at the upper surface of fin 120.The effect of recess 123 It is to prevent the wedge angle of 210 corresponding position of groove and the bending place of fin 120 from occurring to do when fin 120 and the assembly of groove 210 It relates to.

In the present invention, the concrete shape of recess 123 is not particularly limited, such as the cross sectional shape of recess 123 Can be semicircular, rectangle or other can make the wedge angle of groove 210 be contained in the shape in recess 123 without interfering with it Shape.

As shown in Fig. 2, in a preferred embodiment of the utility model, the inner sidewall 121 and lateral wall of fin 120 Another side wall in 122 can be without above-mentioned bending place, in other words, another side wall of fin 120 can be by What 102 forward edge 101 of rear of platform 110 extended linearly.

The other side in another embodiment of the utility model, in the inner sidewall 121 and lateral wall 122 of fin 120 Wall extending direction forward have bending place and formed the second inclined-plane, the second inclined-plane can be with the first inclined-plane 1211 it is parallel, It is also possible to angled.Specifically, by taking the extending direction on the first inclined-plane 1211 shown in Fig. 2 as an example, to illustrate second The extending direction on inclined-plane.In Fig. 2, the first inclined-plane 1211 forward and extends internally, and the second inclined-plane can be parallel to first Inclined-plane 1211 forward and extends internally.Certainly, the second inclined-plane is also possible to forward and outwardly extending.

Preferably, the second inclined-plane can be with the first inclined-plane 1211 it is symmetrical in central axes in the front-back direction with fin 120 Setting, accordingly, when liner 20 is fixed on tibial 10, there are two symmetrically arranged with each groove 210 tool for each fin 120 Inclined-plane mating surface, it is more efficient to hinder the forward slip of liner 20, reduce the abrasion of the lower surface of liner 20.

In an embodiment of the utility model, interference can be on outer extending direction including fin 120 and groove 210 Cooperation, prevent that there is gap in inward-outward direction, to cause shaking.

As shown in Fig. 5 to Fig. 8, in an embodiment of the utility model, front boss 130 has undercutting before at least one 1301, rear boss 140 has undercutting 1401 after at least one, pads 20 lower surface and there is at least one to be caught in preceding undercutting 1301 Front protrusion 2201 and at least one be caught in after undercutting 1401 rearward projection.

Accordingly, the cooperation of fin 120 and groove 210 can effectively prevent liner 20 square in a front/back relative to tibial 10 To with moved on medial/lateral direction, the cooperations of preceding undercutting 1301 and front protrusion 2201 and rear undercutting 1401 and rearward projection can It effectively prevent movement of the liner 20 relative to tibial 10 in an upward direction.

Fin 120 anteriorly extends from rear portion, and in the installation process of liner 20, fin 120 can play alignment and lead To effect, so that the groove 210 of liner 20 is slided exactly along fin 120 to rear 102.Specifically, user can be first By groove 210 be aligned fin 120, slided backward then along fin 120, until rearward projection be caught in after undercut 1401, finally to The front of lower pressing liner 20, so that fin 120 is placed in completely in groove 210, while front protrusion 2201 is caught in preceding undercutting 1301.Accordingly, liner 20 is completely fixed on tibial 10, realizes front/rear direction, medial/lateral direction and up and down Direction it is sealed.

In an embodiment of the utility model, the rears of platform 110 are arranged at least one above-mentioned rear undercutting 1401 102 middle parts.For example, as shown in fig. 7, the rear 102 of platform 110 is arranged, there are three rear boss 140, wherein being located at rear The rear boss 140 at 102 middle parts undercuts 1401 after having one, and other two rear boss 140 undercuts 1401 after can not having.Phase The rear of Ying Di, 20 lower surfaces of liner are provided with grooving 230 after three to match respectively with three rear boss 140, wherein position Rear grooving 230 in middle part has the rearward projection to match with rear undercutting 1401, after grooving 230 can not have after other two Protrusion.

The utility model also provides a kind of knee-joint prosthesis component, the tibial including one or more any of the above-described 10, the liner 20 and multiple femoral components 30 of multiple any of the above-described, the connection relationship between three is same as described above, herein It repeats no more, it is plurality of to pad 20 in the of different size of inward-outward direction.

The design of knee-joint prosthesis is especially commercially available in the form of various different in width usually with various different sizes, It is the different situations in order to adapt to the figure and bone of patient in different groups in this way.Based on this, knee provided by the utility model Articular prosthesis component has fully considered the flexibility of tibial 10 and liner 20 in terms of size.

Specifically, although each liner 20 in multiple liners 20 can be different in the width of inward-outward direction, The fin 120 and front and back boss of each tibial 10 and the location and shape of undercutting and 20 further grooves 21 of each liner and before The location and shape of grooving and protrusion are constant afterwards, therefore it is constant for padding 20 groove 210 and the matching relationship of fin 120 's.Accordingly, the liner 20 of multiple and different width can be fixed on to the tibial 10 of same size, this is surgeon in art Bigger freedom degree is provided when selecting in preceding and art using various sizes of prosthesis structure.

According to described above, the various designs of knee-joint prosthesis and knee-joint prosthesis component provided by the utility model allow to change It is apt to the exchange ability of different size prostheses.Specifically, any one in multiple liners 20 of different size can be fixed to Same size tibial 10, this exchange ability can allow for reducing tibial 10 in knee-joint prosthesis component deposit Deposit, the liner 20 for allowing to select suitable dimension can be also implanted into after tibial 10 in art.

It should be appreciated that the utility model be not limited in its application to this specification proposition component detailed construction and Arrangement.The utility model can have other embodiments, and can realize and execute in many ways.Aforementioned change Shape form and modification are fallen in the scope of the utility model.It should be appreciated that this reality of this disclosure and restriction It is mentioned or all alternative groups of two or more apparent independent features with the novel text and/or drawings that extend to It closes.All these different combinations constitute multiple alternative aspects of the utility model.Embodiment described in this specification is said The best mode for becoming known for realizing the utility model is illustrated, and those skilled in the art will be enable practical new using this Type.

Claims (10)

1. a kind of knee-joint prosthesis characterized by comprising

Tibial upwardly extends including platform and by the upper surface of the platform and is extended forward by the rear portion of the platform One or more fins, the leading edge of the upper surface of the platform is provided at least one front boss, the upper surface of the platform Rear be provided at least one rear boss；

Liner, the lower surface of the liner have the groove to match with the fin, and the liner has and the front boss Matched preceding grooving, the liner have and the matched rear grooving of the rear boss；And

Femoral component is connect with the upper surface joint of the liner；

Wherein, at least one described fin has inner sidewall and a lateral wall, the inner sidewall and the lateral wall wherein one side wall With bending place and the first inclined-plane is formed, described first tiltedly extends away from the direction of wherein another side wall.

2. knee-joint prosthesis according to claim 1, which is characterized in that the upper surface on first inclined-plane and the platform Intersecting lens is formed, the angle between the intersecting lens and the central axes in the front-back direction of the platform is greater than 0 degree.

3. knee-joint prosthesis according to claim 2, which is characterized in that the angle is 2 degree of -70 degree.

4. knee-joint prosthesis according to claim 1-3, which is characterized in that the fin is a pair, Yi Duisuo The middle part that the platform is arranged in fin is stated, an at least fin in axis parallel in the front-back direction or is in the platform Angle.

5. knee-joint prosthesis according to claim 1-3, which is characterized in that the bending place has recess, institute The upper surface for stating recess from the platform upwardly extends and terminates at the upper surface of the fin.

6. knee-joint prosthesis according to claim 1-3, which is characterized in that the inner sidewall of the fin and Another side wall does not have the bending place in the lateral wall；Or

Another side wall has the bending place simultaneously in extending direction forward in the inner sidewall and the lateral wall of the fin The second inclined-plane is formed, second inclined-plane and first inclined-plane are parallel or angled.

7. knee-joint prosthesis according to claim 1-3, which is characterized in that the fin and the groove are in width Spend direction interference fit.

8. knee-joint prosthesis according to claim 1-3, which is characterized in that the front boss has at least one Preceding undercutting, the rear boss are undercut after having at least one, and there is at least one to be caught in the preceding bottom for the lower surface of the liner The front protrusion cut is caught in the rear rearward projection undercut at least one.

9. knee-joint prosthesis according to claim 8, which is characterized in that at least one described rear undercutting is located at the platform Rear in the middle part of.

10. a kind of knee-joint prosthesis component characterized by comprising

One or more such as described in any item tibials of claim 1-9；

Multiple such as described in any item liners of claim 1-9, each liner is in the of different size of inward-outward direction；And

Multiple femoral components, the femoral component are connect with the upper surface joint of the liner.