33 results about "Knee arthrodesis prosthesis" patented technology

The invention provides a knee joint prosthesis tibial plateau capable of enhancing fixation and a tool matched with the tibial plateau, the knee joint prosthesis tibial plateau specifically comprises a tibia support, the tibia support is of a hollow cylinder structure, and three convex bodies are fixedly arranged on the outer surface of the tibia support; a groove penetrating into the tibia support is formed in the abutment, and the abutment is fixedly arranged on the tibia support; the pushing device comprises extension rods arranged at the two ends of a worm, the worm with threads arranged on the outer surfaces of the two ends, turbines arranged on the two sides of the worm, upper supporting bodies arranged at the tops of the turbines and connected with the fixing device through first connecting bodies, and lower supporting bodies arranged at the bottoms of the turbines and connected with the fixing device. The fixing device is a hollow cone, a first spring is arranged in the fixing device, one end of the first spring is connected with the first connector, and the other end of the first spring is connected with a fixing block. According to the technical scheme, the technical problem that after the knee joint prosthesis is implanted into the tibia, the tibial plateau is unstable, the prosthesis is loosened and disengaged, and then bone fusion is affected is effectively solved.

The application provides a knee joint prosthesis tibial plateau capable of enhancing fixation and a matching tool, and specifically comprises: a tibial tray, which is a hollow cylindrical structure and is externally provided with three convex bodies; a base, which is provided with a groove penetrating into the tibial tray and is fixed on the tibial tray; a pushing device, which comprises: an extension rod arranged at both ends of a worm, a worm with threads arranged on the outer surface of both ends, a turbine arranged at both sides of the worm, an upper support body arranged on the top of the turbine and connected with a fixing device through a first connecting body, and a lower support body arranged at the bottom of the turbine and connected with the fixing device; and the fixing device is a hollow cone, which is internally provided with a first spring, one end of the first spring is connected with the first connecting body, and the other end is connected with a fixing block. The technical scheme of the application effectively solves the technical problem that after the knee joint prosthesis is implanted into the tibia, the tibial plateau is not stable, the prosthesis is loose and comes off, and bone fusion is affected.

The application discloses a mechanical locking type tibial platform, a tibial prosthesis and a knee joint prosthesis. The mechanical locking type tibial platform comprises a platform holder used for being attached to the proximal end of a tibia, a middle column extending downward along the center of the platform holder and used for being inserted into the marrow cavity of the tibia, an axial hole being arranged in the center of the middle column, a sleeve arranged in the axial hole of the middle column, a limiting structure being arranged on the outer wall of the sleeve, the limiting structure being configured to cooperate with the middle column to enable the sleeve to slide only in the axial direction of the axial hole, a fastener connected to the sleeve and protruding from the outer side wall of the middle column and used for being inserted into the cortical bone of the tibia, and a stand column, one end of the stand column being provided with a limiting block used for abutting against the top surface of the platform holder, and the other end of the stand column being provided with a threaded segment which is threadedly connected to the inner wall of the sleeve. The cooperation of the stand column, the sleeve and the fastener can lock the platform holder to the proximal end of the tibia and ensure the initial stability of the tibial platform.

The invention belongs to the technical field of medical instruments, and particularly discloses a meniscus liner and a hinge type knee joint prosthesis. The meniscus liner comprises a liner body, in the thickness direction of the liner body, the liner body is provided with a connecting hole for a rotating shaft to penetrate through, the connecting hole comprises a taper hole section and a straight hole section which are sequentially communicated in the axial direction of the connecting hole, and the taper hole section comprises a plurality of sub-hole sections which are sequentially communicated in the axial direction of the taper hole section; the inner diameters of the sub-hole sections are sequentially reduced in the direction from the end, away from the straight hole section, of the taper hole section to the end, close to the straight hole section, of the taper hole section; one end of the rotating shaft can be installed on the straight hole section, the other end of the rotating shaft can abut against the inner wall face, away from the straight hole section, of the sub-hole section, and a containing cavity can be formed between the inner wall face of the taper hole section and the outer wall of the rotating shaft. Abrasion with a hinge assembly can be reduced, and discomfort of a patient can be relieved.

This invention provides a fixation device and assembly method for pericondylar fractures of the knee joint prosthesis. The knee joint prosthesis includes a femoral condyle, a tibial plateau, and a tibial pad. The femoral condyle includes an anterior condyle, two posterior condyles, and an intercondylar fossa. A fixation device is installed in the intercondylar fossa, comprising an intramedullary fixation pin and a connecting fixation block. The connecting fixation block is installed within the intercondylar fossa and engages with the force-applying end of the intramedullary fixation pin. The connecting fixation block includes a main body with a top surface facing the tibial pad and a bottom surface opposite the top surface. The bottom surface extends away from the top surface to form a protrusion, and a through hole is formed within the protrusion, which is used to accommodate and fix the force-applying end of the intramedullary fixation pin. This invention embeds the entire connecting fixation block within the intercondylar fossa, fully utilizing the existing intercondylar fossa space of the PS-type prosthesis to establish a precise channel for the intramedullary fixation pin, thereby fixing the pericondylar fracture through structural fit.

A tibial spacer (10) includes a spacer block (16) including opposing bearing surfaces (18A, 18B), an alignment slot (14) extending into the spacer block, and a handle extending from the spacer block. The spacer block can include feet (12A, 12B) for passively engaging the femur or pegs (112A, 112B) for actively engaging the femoral component such that the spacer block is connected to the femur as the tibia rotates. A tibial spacer system includes a temporary component having an alignment tab (222) extending from a body and an alignment indicator on the body, a femoral component (240) and a pin (264) extending from the femoral component. The pin can engage the alignment tab such that the temporary component is connected to the femur as the tibia rotates. In addition to or as an alternative to the alignment tab and pin, the temporary component can include a tibial plate (30) that is rotatably connected to the temporary component.

The invention provides an individualized tibia defect repairing type knee joint prosthesis, and belongs to the technical field of orthopedic implants. The device is formed by assembling a femoral condyle, a femoral bone marrow needle, a plateau pad, a tibia plateau, a restoration body and a tibia bone marrow needle. Wherein the tibia platform and the restoration body are matched through metal-metal threads and are assisted by bone cement to achieve anti-rotation locking, the restoration body adopts a 3D printing individualized bone trabecula structure and is compounded with an HA coating to promote bone ingrowth, the tibia bone marrow needle and the platform are connected through a standard taper connector, inventory and individualization compatibility is achieved, and the bone marrow needle and the platform are connected through a standard taper connector. The defects that an existing prosthesis is large in bone mass loss, unattractive in reconstruction, free of bone ingrowth function, high in processing cost and the like are overcome, and the postoperative function of a tibia defect patient and the long-term stability of the prosthesis can be remarkably improved.

The present invention relates to a ceramic femoral component (200) of a knee prothesis comprising • - an inner surface of the femoral component, and • - at least one, preferably at least two projections (207a, 207b) extending inwardly away from the inner surface of the femoral component for guiding the ceramic femoral component on the patient's femur in anterior-posterior direction and positioning the ceramic femoral component on the patient's femur by formfit or pressfit.

The invention relates to the technical field of medical instruments, in particular to a 3D (three-dimensional) biological knee joint and a preparation method thereof.The 3D biological knee joint comprises a femoral condyle component, a tibia support component, a meniscus component and a patella component; according to the method, individualized knee joint data of a patient is obtained through CT / MRI scanning, reverse modeling is conducted in combination with Mimics software, a precisely-matched prosthesis three-dimensional model is generated, and the success rate is increased; based on specific anatomical features of a patient, adaptability errors of a traditional standardized prosthesis are avoided, operative wounds are reduced, and the initial stability of the prosthesis and a bone interface is improved. According to the invention, through the combination of technological processes such as individualized modeling, gradient functional coating, multi-process printing and post-treatment, the defects of a traditional knee joint prosthesis are overcome, and the properties such as remarkably improved biocompatibility, excellent antibacterial property, optimized mechanical matching property and accurate individualized adaptation are improved.

The utility model relates to the field of knee joint prostheses, in particular to a knee joint prosthesis with a reinforcing structure, which comprises a tibia support, a prosthesis body and a first fixing rod, a second fixing rod is arranged at the bottom of the tibia support, a mounting seat is embedded in the middle of the prosthesis body, and the bottom of the first fixing rod is fixedly connected with the top of the mounting seat. The tibia support and the prosthesis body are in implantation connection with knee joint bones of a patient through a second fixing rod and a first fixing rod respectively, the tibia support and the prosthesis body are rotationally connected through a first connecting piece and a second connecting piece, and a rubber column is fixedly installed at the bottom of the cylinder, installed in the sleeve in a clamped mode and capable of moving up and down in the sleeve. The knee joint of a patient can be bent conveniently, flexibility is higher, the tibia support and the prosthesis body are tightly connected and attached to each other through the first connecting piece and the second connecting piece, and loosening and falling are prevented.

The application discloses a shaft core type knee joint prosthesis and belongs to the technical field of artificial prosthesis. The knee joint prosthesis comprises a femoral condyle prosthesis and a tibial plateau support, and further comprises a tee joint structure. The top end of the femoral condyle prosthesis is connected with a bone cutting segment through taper cooperation, and the joint end of the femoral condyle prosthesis is provided with a transversely penetrating shaft hole. The top center of the tibial plateau support is fixed with a counterbore. One end of the tee joint structure is located in the counterbore. The other two opposite ends of the tee joint structure are located in the shaft hole of the femoral condyle prosthesis. The top of the tibial plateau support is provided with a tibial plateau pad corresponding to the joint end surface of the femoral condyle prosthesis. The joint end surface of the femoral condyle prosthesis is located on the upper surface of the tibial plateau pad. The adaptability and stability of the knee joint prosthesis are significantly increased.

The utility model provides a kind of tumour type knee joint prosthesis, for reconstructing the bone defect after distal femur tumour resection of children, including femur prosthesis and tibia prosthesis, the top of femur prosthesis is used to connect with distal femur, the bottom of tibia prosthesis is used to connect with proximal tibia, the bottom of femur prosthesis and the top of tibia prosthesis are connected by pin shaft rotation, the front side of tibia prosthesis is provided with limiting portion, limiting portion is used to limit tibia prosthesis and femur prosthesis knee hyperextension.In the front side of limiting portion is provided with the concave groove of recession to the rear, the intersection of the top surface and the front side of limiting portion is provided with avoidance chamfer.So, when patient carries out knee joint flexion, limiting portion no longer occurs interference with the inner side of patella, avoid limiting portion to patella damage.

The invention discloses a bionic meniscus mechanical adaptive knee joint prosthesis fixing device which comprises a tibia, a meniscus prosthesis, a fractal porous anchor and a shape memory polymer sleeve, the meniscus prosthesis is arranged on a platform of the tibia, the fractal porous anchor penetrates through the meniscus prosthesis and extends into the tibia, so that the meniscus prosthesis is fixed on the tibia platform, and the shape memory polymer sleeve is arranged in the shape memory polymer sleeve. The fractal porous anchor is of a gradient pore structure and can be directly inserted into bone tissue to form a minimally invasive channel, the shape memory polymer sleeve wraps the middle section, extending into the tibia, of the fractal porous anchor, the shape memory polymer sleeve shrinks at low temperature, and the glass transition temperature of the shape memory polymer sleeve is 31-38 DEG C. The three core problems that a traditional knee joint prosthesis is high in loosening rate, rapid in abrasion and poor in adaptability are solved, an innovative solution is provided for the field of orthopedic implants, and the knee joint prosthesis particularly conforms to the development trend of precise medical treatment and rapid rehabilitation surgery.

The invention discloses a knee joint prosthesis. The knee joint prosthesis comprises a thighbone component, a tibia component and a prosthesis coating. The tibia component comprises a tibia cushion block mechanism, a tibia articular surface liner mechanism, a tibia long rod mechanism, a medicine inserting cavity and a long rod slow-release medicine guide hole. The bending and stretching movement of a natural knee joint can be simulated between the thighbone component and the tibia component; in the postoperative stage, a sustained-release drug tablet is inserted into a drug insertion cavity, is guided downwards through a long-rod sustained-release drug guide hole, sequentially passes through a tibia cushion block mechanism and a tibia long-rod mechanism, and is gradually released to peripheral tissues of a knee joint prosthesis through the long-rod sustained-release drug guide hole; longitudinal three-dimensional medicine slow release from the articular surface to the marrow cavity is achieved, local infection can be restrained, postoperative inflammatory response can be relieved, the anti-infection effect is improved, the overall structure is designed in a modular mode, surgical operation, medicine supplement and assembly maintenance are facilitated, and good use convenience and safety are achieved.

The invention relates to a femoral condyle prosthesis, a femoral condyle prosthesis system and a knee joint prosthesis, the femoral condyle prosthesis comprises a main body, a front side cushion block and a rear side cushion block, the main body comprises a front condyle part, a far end part and a rear condyle part, and the front condyle part, the far end part and the rear condyle part are sequentially connected; the front side cushion block is detachably installed on the side, facing the femur, of the front condyle part, and the rear side cushion block is detachably installed on the side, facing the femur, of the rear condyle part. According to the femoral condyle prosthesis, the front cushion block and the rear cushion block are arranged on the front condyle portion and the rear condyle portion of the main body respectively, the relative position of the femoral condyle prosthesis and the distal femur can be adjusted, the problem that the femoral condyle prosthesis moves forwards or backwards relative to the preset position after being implanted due to the fact that the osteotomy position is inaccurate is solved, and the stability of the knee joint after being implanted is guaranteed.

The invention discloses a construction method and application of a calculation model of varus knee joint contact stress, and the method comprises the steps: setting a femur and femur cartilage of a knee joint as first elastomers, setting a tibia and tibia cartilage as second elastomers, respectively setting a high-elasticity-modulus layer and a low-elasticity-modulus layer, applying a normal force to the high-elasticity-modulus layer and introducing a modification coefficient, obtaining the corrected contact radius and peak pressure, and constructing a dynamic equilibrium equation of the introversion knee joint; adding meniscus parameters, and constructing a peak contact stress model of double contact areas of the introversion knee joint; constructing a strain function for the low-elastic-modulus layer by adopting a Yeoh model to obtain the elastic modulus of the meniscus material during large strain; inputting the image data, the introversion angle and the load parameters of the subject into the mathematical model of the peak contact stress of the knee joint, comparing the obtained analytical solution with the numerical solution of the finite element model, and if the analytical solution is within a preset range, proving that the mathematical model is correct, and applying the mathematical model to the optimization application of the artificial meniscus and the knee joint prosthesis.

The invention provides an adjustable knee joint tibial plateau pad fatigue loading device, and belongs to the technical field of knee joint prosthesis tibial plateau pad stand column fatigue damage tests. A tibial plateau pad clamping device; the tibia plateau pad clamp tool comprises a tibia plateau pad, a screw and a rectangular pressing plate, the tibia plateau pad is located at one side end of the tibia plateau pad clamping device, the device performs an experiment by adopting a real prosthesis, and a traditional oval pressing head tool is completely replaced; and the stress state of the knee joint prosthesis in actual use can be highly restored. An oval groove matched with a real femoral condyle is formed in an adjustable rectangular block in the femoral condyle clamp tool, and the effect that the force application angle and the contact area are consistent with those of clinical working conditions is ensured by being matched with a curing liquid fixing technology; meanwhile, the 3D printing customized tibial plateau pad clamping device perfectly reproduces a contact interface between the prosthesis and the bone.

The application provides a knee joint replacement surgery planning method and device based on X-ray images, equipment and a storage medium. The method comprises the following steps: acquiring two orthogonal X-ray images of a knee joint; using a statistical shape model method to three-dimensionally reconstruct a three-dimensional model of a femur and a tibia of the knee joint from the two input X-ray images, and outputting key point positions; recommending a prosthesis model and a pose according to the three-dimensionally reconstructed model and the key point positions; confirming the inspection result by a doctor by using the spatial relationship constructed by the key points, and further adjusting the prosthesis pose according to needs, and finally outputting a knee joint prosthesis replacement surgery planning scheme. The method disclosed by the application uses the statistical shape model method to three-dimensionally reconstruct a two-dimensional X-ray image into a three-dimensional bone model and visualize the three-dimensional bone model, which is beneficial to the doctor to more intuitively observe the prosthesis positioning condition, so that the surgery scheme can be better outputted. Moreover, the method disclosed by the application has a relatively low cost and can cover more people.

The present application relates to a kind of femoral condyle prosthesis and knee joint prosthesis, the femoral condyle prosthesis includes main body and rear pad, the main body includes front condyle, distal end and rear condyle, the front condyle, the distal end and the rear condyle are connected in turn, the rear pad is located in the side of the rear condyle towards human femur, the position of the rear pad is adjustable relative to the rear condyle along the thickness direction of the rear condyle.During operation, doctor can adjust the position of the rear pad in the femoral condyle prosthesis of the present application according to the osteotomy condition of the distal end of human femur, so that the femoral condyle prosthesis is in contact with the distal end of human femur and is pressurized fixed, realize the initial stability of non-cement femoral condyle prosthesis, and it is beneficial to the bone growth in later period.

The utility model provides an anti-infection biological knee joint prosthesis, and relates to the technical field of orthopedic implants. The anti-infection biological type knee joint prosthesis comprises a thighbone prosthesis and a tibia prosthesis, a medicine storage area is arranged in the thighbone prosthesis and / or the tibia prosthesis, the medicine storage area comprises a first hole channel and a second hole channel, and the first hole channel and the second hole channel are communicated in a crossed mode. A plurality of micropores are formed in the face, combined with the bone, of the femoral prosthesis and / or the face, combined with the bone, of the tibia prosthesis, and the micropores are arranged at intervals and all communicated with the medicine storage area. According to the anti-infection biological type knee joint prosthesis, the medicine storage area is provided with the first hole channel and the second hole channel which are communicated in a crossed mode, so that the distribution range of the medicine storage area is wide, and the micropores can be selectively formed in different positions of the thighbone prosthesis and the tibia prosthesis. Liquid medicine diffusion can be carried out on the position where infection needs to be resisted through the micropores, so that the effect of preventing or treating infection is achieved.

The invention discloses a biological fixation knee joint prosthesis and an implantation tool, and relates to the technical field of knee joint implantation, the biological fixation knee joint prosthesis comprises a main body, a plurality of positioning columns are arranged on one horizontal end face of the main body, a plurality of guide grooves are formed in the same side where the positioning columns are located, and a fixing part is embedded in each guide groove; the implanting tool further comprises a clamping assembly, the clamping assembly comprises a bearing piece, a rotary knob is arranged on the side wall of the bearing piece, a clamping plate is installed in the bearing piece in a sliding mode, a first auxiliary block and a second auxiliary block are installed on the bearing piece, the knee joint prosthesis and the skeleton can be rapidly fixed through the fixing piece, and the fixing piece and the knee joint prosthesis are detachably designed; the difficulty of rebuilding the knee joint prosthesis can be reduced; due to the fact that the bone and the prosthesis are locked through the fixing piece, the prosthesis can be prevented from loosening, and the service life of the prosthesis is greatly prolonged.

The present invention relates to a ceramic femoral component (200) of a knee prothesis comprising • - an inner surface of the femoral component, and • - at least one, preferably at least two projections (207a, 207b) extending inwardly away from the inner surface of the femoral component for guiding the ceramic femoral component on the patient's femur in anterior-posterior direction and positioning the ceramic femoral component on the patient's femur by formfit or pressfit.

A knee joint prosthesis includes a femoral component and a tibial component. The femoral component includes a medial condylar articulation surface, a lateral condylar articulation surface and a central box therebetween, the central box being enclosed on a bone-facing side of the femoral component and open on a tibial-facing side of the femoral component. The tibial component including a medial tibial articulation surface, a lateral tibial articulation surface and a post therebetween, the post being disposed within the central box of the femoral component. A concave curved surface portion of the box travels along a convex curved surface portion of the post over a range of motion of the tibial component relative to the femoral component such that an axis of rotation of the box of the femoral component and the post of the tibial component is coincident over the range of motion.

The application provides a knee joint prosthesis periprosthetic fracture fixation device and an assembling method. The knee joint prosthesis comprises femoral condyles, a tibial plateau and a tibial pad. The femoral condyles comprise an anterior condyle, two posterior condyles and an intercondylar fossa. The fixation device is installed at the intercondylar fossa. The fixation device comprises an intramedullary fixation needle and a connecting fixation block. The connecting fixation block is installed in the intercondylar fossa. The connecting fixation block is connected with the force applying end of the intramedullary fixation needle. The connecting fixation block comprises a main body. The main body has a top surface facing the tibial pad and a bottom surface opposite to the top surface. The bottom surface extends in a direction away from the top surface to form a protruding part. A through hole penetrating through the main body is formed in the protruding part. The through hole is used for accommodating and fixing the force applying end of the intramedullary fixation needle. The whole connecting fixation block is embeddedly installed in the intercondylar fossa. The original intercondylar fossa space of the PS type prosthesis is fully utilized to establish a precise channel of the intramedullary fixation needle. The periprosthetic fracture is fixed through structural cooperation.

This invention is entitled "Orthopedic Prosthetic System for Rotationally Articulated Knee Prostheses". The invention discloses an orthopedic prosthesis comprising a femoral component configured to attach to the distal end of a patient's femur. A tibial support is configured to attach to the proximal end of a patient's tibia. A tibial insert is configured to rotate relative to the tibial support. A modular insert is received in a cavity defined within the tibial insert. The femoral component is rotatably coupled to the body of the modular insert.

The invention discloses a continuous drug delivery device used in an infected articular cavity around a knee joint prosthesis, and belongs to the field of medical instruments, the same as the prior art, the continuous drug delivery device comprises an infusion tube, the infusion tube comprises a connecting section and a liquid delivery section, the liquid delivery section is located in the articular cavity, a plurality of holes are evenly formed in the tube wall of the liquid delivery section, and the holes are distributed in a spiral shape. Compared with the prior art, the infusion tube is formed by combining a plurality of pipelines which are detachably connected together, an injector connector and a liquid pumping device connector are arranged at the tail end of a connecting section, a balloon tube is arranged on one side close to the connectors, one end of the balloon tube is communicated with a balloon, and the other end of the balloon tube extends out of the body. According to the continuous drug delivery device, accurate delivery of liquid medicine and safety and reliability of the treatment process are guaranteed from different angles, the cure rate of infection around the knee joint prosthesis is increased, the treatment and rehabilitation cycle of a patient is shortened, and prognosis of the patient is improved.

The application discloses a kind of modular knee joint prosthesis, it is related to medical instrument technical field, the knee joint prosthesis includes femoral prosthesis, locking connection component, tibial prosthesis and femoral extension module, during initial replacement surgery, medical staff carries out osteotomy to femur, after being coated with bone cement on femoral joint, femoral prosthesis is implanted femur osteotomy surface, subsequently, tibial prosthesis is installed to tibial osteotomy surface after being coated with bone cement on tibia, according to clinical requirement, use corresponding specification locking connection component, locking connection component is connected and fixed with tibial prosthesis, finally, the relative position of femoral prosthesis and tibial prosthesis is adjusted, and the installation of prosthesis of knee replacement surgery is completed, when revision surgery is carried out, for the size difference of femoral defect of different patients, medical staff will corresponding specification femoral extension module is loaded into femoral prosthesis, the same set of knee joint prosthesis system is compatible initial replacement and revision surgery by the application, the application has the effect of improving clinical flexibility.

The invention relates to a spacer mould used in the field of health, particularly in orthopaedics and traumatology, during the treatment of infections around knee prostheses. The invention particularly relates to a modular spacer mould for the femur, having detachable moulds that allow the length to be adjusted by means of a toothed structure and that enable the antibiotic cement to be shaped in the desired size.

The present application relates to a kind of knee joint prosthesis and its manufacturing method, wherein the knee joint prosthesis includes tibial platform prosthesis, tibial platform prosthesis has osteotomy fitting area;Osteotomy fitting area includes integration area, anchoring area and transition zone;Integration area is positionally corresponding with host cancellous bone area, for inducing bone tissue growth to realize long-term biological fixation;Anchoring area is positionally corresponding with host sclerotic bone area or cortical bone area, realizes immediate fixation by mechanical interlocking;Transition zone is located between integration area and anchoring area, and the porosity of transition zone gradually decreases along the direction of integration area to anchoring area, and structural rigidity gradually increases along the direction of integration area to anchoring area, its beneficial effect is, the active adaptation of prosthesis and host bone bed non-uniform biological characteristics is realized, immediate mechanical stability and long-term biological integration effect are obtained under the premise of not needing permanent screw auxiliary fixation, the risk of prosthesis loosening is reduced, and the clinical service life of prosthesis is effectively prolonged.

The invention provides a knee joint prosthesis test mold device, which comprises a femoral condyle prosthesis test mold, an intercondylar fossa arranged on the outer surface of the femoral condyle prosthesis test mold; the laser transmitter is arranged in the intercondylar fossa; the tibia test mold assembly comprises a tibia platform prosthesis test mold and a tibia spacer test mold, the tibia spacer test mold is arranged on the surface, facing the femoral condyle prosthesis test mold, of the tibia platform prosthesis test mold, and the laser emitting end of the laser emitter faces the tibia spacer test mold; wherein the femoral condyle prosthesis test mold and the tibia test mold assembly have a relative rotation state and a relative static state, and when the femoral condyle prosthesis test mold and the tibia test mold assembly are in the relative rotation state, the femoral condyle prosthesis test mold can drive the laser transmitter to rotate relative to the tibia test mold assembly. According to the technical scheme, the problem that in the prior art, when total knee arthroplasty is carried out, the precision of the tibial prosthesis function rotation axis is poor is effectively solved.