CN104644290A - Porous total knee prosthesis - Google Patents

Abstract

The porous artificial knee joint includes a femoral ankle prosthesis, an artificial meniscus and a tibial tray prosthesis. The solid main part of the femoral ankle prosthesis is provided with connection holes, and the surface combined with the patient's femur is covered with a The surface of the first porous fixation layer opposite to the patient's femur forms a structure that encloses the end of the femur after osteotomy, and the surface opposite to the femur is symmetrically provided with two femoral articular surfaces ; The artificial meniscus has a protrusion that cooperates with the connection hole and is used to prevent the dislocation of the femoral ankle prosthesis, the tibial articular surface that cooperates with the femoral articular surface, and the connecting portion that cooperates with the tibial support prosthesis; the upper end of the tibial support prosthesis It has a positioning part matched with the connecting part, the outer surface of the lower end supporting part is covered with a second porous fixing layer, and the surface of the tibial joint is also covered with a third porous fixing layer. The artificial knee joint of the present invention has strong bonding force with the patient's femur bone, is conducive to the growth of bone tissue, and can realize a better biological fixation effect.

Description

Porous artificial knee joint

technical field

The invention relates to the field of medical devices, in particular to any man-machine interactive (also known as passive) mechanical arm and ball joint locking method and device for a robot.

Background technique

Artificial knee arthroplasty has become a treatment for end-stage joint diseases and femoral neck fractures in the elderly, and it has significantly improved the quality of life of patients. Every year, about 1.5 million artificial joint replacement operations are performed on patients with joint loss of function caused by arthritis in the world. Artificial hip replacement can better relieve pain, improve joint function, restore joint stability and limb function, and has been recognized by the majority of patients.

The human knee joint is subjected to tension, pressure, torsion, interface shear, repeated fatigue, wear and other forces under load. Therefore, it is required that the implanted tibial and femoral ankle prosthesis must be firmly fixed to the bone.

The artificial knee joint generally consists of three components: femoral ankle prosthesis, artificial meniscus, and tibial support prosthesis. The artificial meniscus is located between the femoral ankle prosthesis and the tibial tray prosthesis, and can transmit load between the femoral and tibial tray prosthesis.

The main body and surface of traditional artificial knee joints are non-porous and dense structures, and the surface roughness is usually increased to achieve the purpose of improving the frictional combination with the bone. Long-term follow-up data show that about 10% of patients need artificial joint revision within 15 years after the initial artificial joint replacement. Aseptic loosening of artificial joint prosthesis is one of the most common complications after artificial joint replacement, and it is also the main factor that limits the service life of artificial joints. Once the prosthesis loosens, it will cause pain, joint dysfunction and other problems, and even require revision surgery.

Therefore, how to obtain bony fixation of the implanted prosthesis as soon as possible is considered to be the key to preventing artificial knee joint loosening. At present, the fixation of artificial joint prosthesis refers to how the tibial tray prosthesis and the femoral ankle prosthesis are fixed to the bone. Fixation methods can be roughly divided into two types: bone cement fixation and biological fixation. However, there are many problems in these two fixing methods.

Bone cement fixation, by filling the bone cement between the installed prosthesis and the bone bed, two interfaces of the prosthesis-bone cement and bone cement-bone are formed, so that the prosthesis is fixed in the bone cement. Bone cement fixation has bone cement fatigue, which makes the effect of bone cement in maintaining the long-term stability of artificial joints unsatisfactory, and "bone cement disease" often occurs, that is, artificial joint loosening and osteolysis. However, if the patient's bone quality is poor, the life of the prosthesis is short, and the activity intensity is low, it is recommended to use bone cement for fixation. But bone cement fixation, due to the existence of bone cement fatigue, makes the effect of bone cement in maintaining the long-term stability of artificial joints unsatisfactory, and "bone cement disease" often occurs, that is, artificial joint loosening and osteolysis.

Biological fixation, also known as non-cemented fixation, is a fixation method in which the porous surface of the artificial joint prosthesis is in close contact with the bone to achieve bone ingrowth to achieve biological atresia. Biological fixed prosthesis depends on the shape of the prosthesis and the tight press fit of the bone bed at the initial stage of implantation, while in the stage of bone ingrowth, it depends on the surface treatment effect of the prosthesis, which is determined by the porous surface/coating on the surface of the prosthesis. It determines how the prosthesis is combined with the bone, thus determining the firmness of the fixation. Biological fixation surfaces are mainly porous into the following two types: (1) Megaporous surfaces (such as coral face, pearl face), prostheses with megaporous surfaces and osseointegration are only mechanically "two-dimensional" fixation, Fixation is achieved only by changing the shear force on the surface of the bone-prosthesis into compressive stress, which has limited strength enhancement. (2) Microporous fixation is divided into two-dimensional surface microporous and three-dimensional porous design. Most of the micropores on the two-dimensional surface are sintered by metal beads, sandblasting, micro-arc oxidation and other methods to realize the microporous structure on the surface (the pore diameter is mostly micron, and the connectivity of the pore layer is poor). The pore size of the hole is between 150-700 microns. When the pore size is less than 100 microns, only fibrous tissue grows into the hole, not bone tissue. Therefore, the micropores on the two-dimensional surface cannot provide bone ingrowth, only the phenomenon of "bone growth", and its interface bonding strength and osteoinductive ability are poor; while the three-dimensional porous surface is mostly realized by plasma spraying, chemical vapor deposition and other methods ( The pore size is 100-700 microns, and the porosity is about 25%-75%), which has stronger osteoinductive ability and interface bonding strength than the two-dimensional porous surface, but it has not obtained good fixation effect in a large number of clinical applications. In the case of clinical repair, its defects are gradually exposed. Due to the weak bonding force between the coating and the prosthesis, the coating peels off, breaks, and the formation of particles causes the prosthesis to loosen. Prospective studies have shown that hydroxyapatite (HA) coated prosthesis has a 5% loosening rate in the medium term, which is significantly higher than that of pure bone cement fixed prosthesis, and the osseointegration around the prosthesis is not continuous. When installing this type of artificial joint, it is necessary to fully ensure that the size of the artificial joint and the bone cavity to be inserted should match very well without leaving any gaps. At the same time, the bone in the bone cavity should also have good support and initial fixation. Only in this way can the artificial joint be stabilized and facilitate the ingrowth of bone in the future. If the non-cemented artificial hip joint becomes loose, it will only appear out of joint, which is less corrosive to bone tissue, less bone tissue loss, and easy to repair.

Prospective studies have shown that the current biological fixation prosthesis has improved the early fixation effect, but the mid- and long-term fixation effect has not improved, mainly due to the loosening and even failure of the prosthesis due to the peeling off, fracture of the coating, and the formation of particles. .

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned defects of the prior art, and provide an artificial knee joint with a strong bonding force with the patient's femur bone, which is beneficial to the ingrowth of bone tissue, and can achieve a better biological fixation effect.

The porous artificial knee joint provided by the present invention comprises a femoral ankle prosthesis, a tibial tray prosthesis and an artificial meniscus between the femoral ankle prosthesis and the tibial tray prosthesis, wherein the femoral ankle prosthesis The body has a solid main part, and the solid main part of the femoral ankle prosthesis is provided with a connection hole, and the surface of the solid main part combined with the patient's femur is covered with a bone that can be combined with the femoral bone for fixation. The first porous fixing layer; on the first porous fixing layer, the surface opposite to the patient's femur is symmetrically provided with an ankle joint surface and between the two ankle joint surfaces and on both sides of the connection hole The junction surface between the ankles forms a structure enclosing the femoral end after the osteotomy, and the solid main part of the femoral ankle prosthesis is symmetrically provided with two femoral articular surfaces on the surface facing away from the patient's femur; the artificial meniscus has a The protrusion that can cooperate with the connection hole and is used to prevent the dislocation of the femoral ankle prosthesis, the tibial articular surface that cooperates with the femoral articular surface, and the connection part that cooperates with the tibial tray prosthesis; the tibial tray The prosthesis includes a solid main body part of the tibial marrow. The upper end of the solid main part of the tibial marrow has a positioning part that can cooperate with the connecting part, and the lower end is a supporting part. The outer surface of the supporting part is covered with a second porous fixing layer.

In a further structural design of the present invention, the surface of the positioning portion on the tibial tray prosthesis opposite to the support portion is the tibial joint surface, and the surface of the tibial joint surface is covered with a third porous fixing layer.

In the specific structural design of the present invention, the thickness of the first porous fixed layer, the second porous fixed layer and the third porous fixed layer are 0.2-3 mm, the pore diameter is 0.2-0.8 mm, and the porosity is 30-90 %.

In the specific structural design of the present invention, the connecting portion on the artificial meniscus includes a boss and a positioning flange arranged on the boss; the positioning portion on the tibial tray prosthesis includes a The concave cavity matched with the boss and the central groove matched with the positioning flange.

In the specific structural design of the present invention, the tibial tray prosthesis bearing part has a frustum-shaped structure with a gradually smaller outer diameter downwards, and along the axial direction of the outer circumference of the large end of the frustum, there are at least two symmetrical The strip-shaped groove, the junction of the strip-shaped groove and the outer periphery of the frustum of the cone is smoothly transitioned.

In the specific structural design of the present invention, the articular surface of the femur is a highly polished surface.

The femoral ankle prosthesis and tibial tray prosthesis of the present invention are made of cobalt-chromium-molybdenum alloy, stainless steel, titanium, titanium alloy, nickel-cobalt alloy or metal tantalum material, and the artificial meniscus is made of ultra-high molecular polyethylene material .

In the specific structural design of the present invention, the solid main part of the femoral ankle prosthesis is provided with positioning wings on both sides for auxiliary fixation combined with the lateral side of the patient's femoral ankle.

The present invention is provided with a patella groove on the solid body part, and in the middle of the contact surface with the patella or the patella prosthesis of the human body, and two pulley surfaces are respectively provided on both sides of the patella groove to form a movable joint with the patella or the patella prosthesis. Connected block parts.

The present invention aims at making the artificial knee joint have a better biological fixation effect (bone ingrowth). A three-dimensional porous structure layer that can be integrally formed is provided on the surface of the femoral ankle prosthesis combined with the patient's femoral bone and the support of the tibial tray prosthesis, and the porous fixation layer and the knee joint prosthesis have high bonding strength and pores in the porous fixation layer. The characteristics of the high rate and the pore diameter of the porous fixation layer are conducive to bone tissue ingrowth, which make the interlocking combination between the patient's bone body and the prosthesis. The extension and interweaving of the connecting channels can overcome the shortcomings of the current artificial prosthesis using the coating for biological fixation, thereby achieving a better biological fixation effect and prolonging the service life of the artificial prosthesis.

Description of drawings

Fig. 1 is the assembly diagram of the porous artificial knee joint provided by the embodiment of the present invention;

Fig. 2 is an exploded diagram of the porous artificial knee joint provided by the embodiment of the present invention;

3A is a schematic structural view of the first porous fixation layer of the femoral ankle prosthesis provided by the embodiment of the present invention;

3B is a schematic structural view of the solid main part of the femoral ankle prosthesis provided by the embodiment of the present invention;

Fig. 3C is a schematic structural view of the first viewing angle of the femoral ankle prosthesis provided by the embodiment of the present invention;

Fig. 3D is a schematic structural diagram of the second viewing angle of the femoral ankle prosthesis provided by the embodiment of the present invention;

FIG. 3E is a schematic diagram of the cross-sectional structure of A-A in FIG. 3D;

Fig. 4A is a schematic structural diagram of the first viewing angle of the artificial meniscus provided by the embodiment of the present invention;

Fig. 4B is a schematic structural diagram of the second viewing angle of the artificial meniscus provided by the embodiment of the present invention;

Fig. 4C is a schematic structural diagram of the third viewing angle of the artificial meniscus provided by the embodiment of the present invention;

Fig. 5A is a schematic structural diagram of the first viewing angle of the tibial tray prosthesis provided by the embodiment of the present invention;

Fig. 5B is a schematic diagram of the structure of B-B in Fig. 5A;

Fig. 5C is a schematic structural diagram of the second viewing angle of the tibial tray prosthesis provided by the embodiment of the present invention;

Fig. 5D is a schematic diagram of the exploded structure of the tibial tray prosthesis provided by the embodiment of the present invention;

Fig. 5E is a schematic diagram of the structure of the second porous fixing layer of the tibial tray prosthesis provided by the embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Referring to Fig. 1-Fig. 5, the present invention provides a kind of porous artificial knee joint, comprises femoral ankle prosthesis 1, tibial support prosthesis 3 and is positioned at described femoral ankle prosthesis 1 and described tibial support prosthesis 3 Artificial meniscus 2, see Fig. 3A-Fig. 3E, wherein said femoral ankle prosthesis has solid body part 12, and the solid body part 12 of described femoral ankle prosthesis 1 is provided with connection hole 13, is positioned at the center of solid body part 12 Position; on the surface of the solid main body part 12 combined with the patient's femur, it is covered with the first porous fixing layer 11 that can be combined with the femoral bone for fixation, and its three-dimensional porous structure is conducive to the growth of bone tissue On the first porous fixing layer 11, the surface opposite to the patient's femur is symmetrically provided with an ankle joint surface 111 and ankle joints located between the two ankle joint surfaces 111 and on both sides of the connection hole 13. The joint surface 112 forms a structure enclosing the femoral end after the osteotomy; on the solid body part 12 of the femoral ankle prosthesis 1, and on the surface opposite to the patient's femur, two femoral articular surfaces 1231 are symmetrically arranged, The articular surfaces 1231 of the two femurs are curved surfaces, which facilitate the rotation of the joints;

Referring to Fig. 4A-Fig. 4C, the artificial meniscus 2 is placed between the femoral ankle prosthesis 1 and the tibial tray prosthesis 3 for conducting load, and it includes a plate body 20, which has a curved periphery The disc-shaped member has a conical protrusion 21 on its upper surface, which can cooperate with the connecting hole 13 and can be inserted into the connecting hole 13 during installation to limit the range of motion of the knee joint and prevent the femoral Dislocation of the ankle prosthesis 1; the upper surface of the body 20 is provided with a tibial articular surface 22 that matches the femoral articular surface 1231 of the femoral ankle prosthesis 1, and is located on both sides of the protrusion 21. The lower end of the body 20 has a The matching connecting portion 23 of the tibial tray prosthesis 4;

5A-5E, the tibial tray prosthesis 3 includes a solid main body part 32 of the tibial marrow, the upper end of the solid main body part 32 has a positioning part 321 that can cooperate with the connecting part 23, and the lower end is a columnar supporting part 322 , the outer surface of the support portion 322 is covered with the second porous fixing layer 31 .

In the above structure, a porous fixing layer is provided on the fixing surface of the artificial prosthesis in contact with the bone, and its porous structure is beneficial to the ingrowth of bone tissue. In this way, the bonding strength between the porous fixation layer and the knee joint prosthesis can be increased, and the porous fixation layer has stronger osteoinductive ability compared with the existing coating mode, and it is easier for bone to grow into and extend in the internal connection channel The interweaving makes the bone and the prosthesis form an interlocking combination, so as to achieve a better biological fixation effect. The artificial femoral ankle prosthesis and the artificial tibial tray prosthesis of the present invention can carry out porous structure design through CAD software, and the artificial prosthesis with porous structure can realize the preparation of the porous fixation layer or the porous fixation layer and the artificial prosthesis through the three-dimensional rapid prototyping system Chemically prepared, and the design of the above-mentioned porous fixing layer is suitable for use in all types of non-cemented artificial knee joint prosthesis, has strong versatility, and can realize industrial production.

Please refer to Fig. 3A-Fig. 3E again. In the specific structural design of the present invention, the femoral ankle prosthesis 1 can be made of cobalt-chromium-molybdenum alloy, stainless steel, titanium, titanium alloy, nickel-cobalt alloy or metal tantalum material. The main body 12 includes a long wrapping 121 , a short wrapping 123 and a bottom 122 connected between the long wrapping 121 and the short wrapping 123 , forming a concave structure with an arc surface. The outer periphery of the short wrapping 123, that is, the surface opposite to the patient's femur, is symmetrically provided with two described femoral articular surfaces 1231, and an arched support platform 1221 is provided upward at the middle position of the bottom 122, and the connection The hole 13 is perpendicular to the arched support platform 1221, and can be a rectangular hole or a polygonal hole as shown in the figure, with a straight edge that can prevent rotation. The two sides 1222 of the arched support platform 1221 form a plane that is attached to the back of the joint surface 112 between the ankles. In this way, the first porous fixing layer 11 covers the inner surfaces of the long wrapping 121 and the short wrapping 123 , the arch support platform 1221 , both sides 1222 and the upper surface 1223 , forming a structure wrapping the femoral end after osteotomy. Since the first porous fixing layer 11 covering the inner surface of the solid body part 12 is composed of multiple different layers and different surfaces, and is designed according to the shape of the femur end after osteotomy, it can be better combined with the human femur , the bonding surface between the first porous fixing layer 11 and the femur is increased, which facilitates the infiltration and growth of bone tissue and can avoid the separation between the first porous fixing layer 11 and the femur end.

Further, the femoral articular surface 1231 is an arc-shaped highly polished surface, which can reduce the friction coefficient between the femoral ankle prosthesis 1 and the artificial meniscus 2, and at the same time, the femoral articular surface 1231 matches the anatomical characteristics of the oriental knee joint, Allows for greater flexion.

Referring to FIG. 3B and FIG. 3C , between the two femoral articular surfaces 1231 , there is also an inter-articular fossa 1232 recessed to facilitate the formation of an arc-shaped surface of the femoral articular surfaces 1231 .

Please refer to Fig. 3B and Fig. 3C again, the solid body part 12 of the femoral ankle prosthesis 1 is also provided with positioning wings 14 on both sides of the connection hole 13, and the positioning wings 14 are concave toward the connection hole 13. The arc-shaped groove is used for auxiliary fixation combined with the lateral side of the patient's femoral condyle to ensure the stability of the connection between the entire knee joint and the human femur.

Referring to Fig. 3D, in the specific structural design of the present invention, a patella groove 1211 is provided in the middle of the outer peripheral surface of the long wrapping 121 of the solid body part 12 along its vertical position, and two sides of the patella groove 1211 are respectively provided with two sides. The trochlear surface 1222 constitutes the trochlear part that is movably connected with the patella or the patella prosthesis, and is movably connected with the contact surface of the human patella or the patella prosthesis to facilitate the rotation of the entire knee joint.

Please refer to Fig. 4A-Fig. 4C, in the specific structural design of the present invention, the artificial meniscus 2 is made of ultra-high molecular weight polyethylene material. Since the knee meniscus is an important part of the knee joint, it has the functions of increasing the joint contact surface, lubricating the joint, bearing and transmitting the load between the tibia and femur, absorbing shock and maintaining the functional structure of the knee joint. Therefore, the anti-articular surface composed of metal and high molecular polyethylene, rather than metal and metal, can increase the biomechanical compatibility of human knee joint activities. The front and rear ends of the protrusion 21 of the artificial meniscus 2 are provided with an arc-shaped sliding surface 24, which is recessed toward the tibial articular surface 22 along its bottom, and smoothly transitions with the bottom of the protrusion 21. On the one hand, it is convenient for the protrusion 21 and the femoral ankle prosthesis 1. Connection and installation, on the other hand, can facilitate the forward and backward rotation of the artificial meniscus 2 and the tibial tray prosthesis 3 around the femoral ankle prosthesis 1; the connecting part 23 includes an arc-shaped boss 232 on the periphery, and the middle position of the boss 232 is There is also a positioning flange 231 outward. In the illustrated embodiment, the structure of the positioning flange 231 is a hollow circular sleeve, which is convenient for processing and helps reduce the weight of the entire component.

Please refer to Fig. 5A-Fig. 5E, in the specific structural design of the present invention, described tibial tray prosthesis 3 is made of cobalt-chromium-molybdenum alloy, stainless steel, titanium, titanium alloy, nickel-cobalt alloy or metallic tantalum material, and described tibial tray The structure of the positioning part 321 at the upper end of the bone marrow solid body part 32 is adapted to the structure of the connecting part 23 of the artificial meniscus 2, including a concave cavity 3211 that matches the structure and shape of the boss 232 and a center that matches the positioning flange 231. The groove 3213 can make the artificial meniscus 2 and the tibial tray prosthesis 3 socketed. In this way, the artificial meniscus 2 and the tibial tray prosthesis 3 can be fixed through double nesting, and the firm positioning and fixing between the two can be realized, and this structure is easy to process, easy to manufacture and convenient to assemble. The columnar supporting part 322 at the lower end of the solid main body part 32 of the tibial marrow has a frustum-like structure with a gradually smaller outer diameter downwards, and at least two symmetrical strips are provided downwards along the axial direction of the outer circumference of the large end of the frustum. The groove 3221, the junction of the strip groove 3221 and the outer periphery of the frustum is smoothly transitioned. The illustrated embodiment shows four strip-shaped arc-shaped grooves, and the cross-section of the support portion 322 shows a smooth transition from a cylinder to a rhombus. Correspondingly, the cross-sectional shape of the outer periphery of the second porous fixed layer 31 is consistent with the cross-sectional shape of the support portion 322 . In this way, it is beneficial to the cooperation of the tibial support prosthesis 3 and the human leg bone, avoiding the loosening of the tibial support prosthesis 3, and simultaneously preventing the rotation of the tibial support prosthesis 3 after being connected, thereby increasing the stability of biological fixation.

Further, in the specific structure of the tibial tray prosthesis 3, the surface of the positioning part 321 opposite to the support part 322 is the tibial joint surface 3213, and the tibial joint surface 3213 matches the anatomical structure of the oriental tibial plateau osteotomy. , and the tibial tray prosthesis 3 has the largest contact area with the tibial osteotomy, reducing the pressure on the tibial bone; on the surface of the tibial joint surface 3213, it is covered with a third porous fixation in contact with the tibial osteotomy The layer 3213 is consistent with the porous structure of the first porous fixed layer 11 and the second fixed layer 31 . Since the tibial joint surface 3213 is in contact with the tibia surface of the human body, a porous structure is designed here, which can realize a larger area of contact with bone tissue on the basis of the first porous fixing layer 11 and the second porous fixing layer 31, and more It is conducive to the ingrowth of bone tissue, and the effect of biological fixation is better.

Specifically, the thickness of the first porous fixed layer 11, the second porous fixed layer 31 and the third porous fixed layer 3213 of the present invention can be 0.2-3mm, the pore diameter is 0.2-0.8mm, and the porosity is 30- 90%. The above parameters can be designed through CAD software operation, and manufactured by a three-dimensional rapid prototyping system. Its pore size and porosity are similar to the porous structure of human cancellous bone, which is conducive to the growth of bone tissue and can achieve firm biological fixation.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (10)

1. a porous artificial knee joint, comprise femur ankle prosthese, tibia support prosthese and the artificial meniscus between described femur ankle prosthese and described tibia support prosthese, it is characterized in that, described femur ankle prosthese has solid body, the solid body of described femur ankle prosthese offers connecting hole, in the surface that described solid body combines with the femur of patient, be covered with the first porous fixed layer that can be combined fixation with femur sclerotin; On described first porous fixed layer, the surface relative with the femur of patient is arranged with ankle faying face and at faying face between ankle faying face and between the ankle being positioned at described connecting hole both sides described in two, form the structure of the femur end after encasing osteotomy, solid body and the surface opposing with the femur of patient of described femur ankle prosthese are arranged with two femoral joint faces; Described artificial meniscus has one and can to coordinate with described connecting hole and for preventing the projection of described femur ankle prothesis dislocation, the tibial prosthesis face of matching with described femoral joint face, the connecting portion that matches with described tibia support prosthese; Described tibia support prosthese comprises tibia marrow solid body, and described tibia marrow solid body upper end has the location division that can coordinate with described connecting portion, and lower end is support, and this support outer surface is covered with the second porous fixed layer.

2. porous artificial knee joint according to claim 1, is characterized in that: the surface relative with described support, the location division on described tibia support prosthese is tibia faying face, and described tibia faying face surface is covered with the 3rd porous fixed layer.

3. porous artificial knee joint according to claim 1, is characterized in that: described first porous fixed layer and described second porous fixed layer thickness 0.2-3mm, aperture 0.2-0.8mm, porosity 30-90%.

4. porous artificial knee joint according to claim 2, is characterized in that: described 3rd porous fixed layer thickness 0.2-3mm, aperture 0.2-0.8mm, porosity 30-90%.

5. the porous artificial knee joint according to any one of claim 1-4, is characterized in that: the described connecting portion on described artificial meniscus comprises boss and is arranged at the locating flange on this boss; Described location division on described tibia support prosthese comprises the cavity coordinated with described boss and the central channel coordinated with described locating flange.

6. the porous artificial knee joint according to any one of claim 1-4, it is characterized in that: described tibia support prosthese support has gradually little in external diameter frustum structure downwards, and along the axis of the large end periphery of described frustum, offer at least two symmetrical strip grooves downwards, the intersection of described strip groove and frustum periphery seamlessly transits.

7. the porous artificial knee joint according to any one of claim 1-4, is characterized in that: described femoral joint face is high burnishing surface.

8. the porous artificial knee joint according to any one of claim 1-4, it is characterized in that: described femur ankle prosthese and tibia support prosthese are made up of vitallium, rustless steel, titanium, titanium alloy, nickel cobalt (alloy) or metal tantalum material, and described artificial meniscus is made up of ultra high molecular polyethylene material.

9. the porous artificial knee joint according to any one of claim 1-4, is characterized in that: the solid body both sides of described femur ankle prosthese be also provided with for the femur ankle of patient outside combine auxiliary fixing location wing.

10. the porous artificial knee joint according to any one of claim 1-4, it is characterized in that: on described solid body, and with Human Patella or patellar prosthesis contact surface centre position, be provided with patellar groove, the both sides of described patellar groove are respectively equipped with two trochlear surfaces, form the coaster part be flexibly connected with patella or patellar prosthesis.