Differentiated tibial plateau prosthesis system

Abstract

The invention relates to the field of medical instruments, in particular to a differentiated tibial plateau prosthesis system which comprises a plateau base, an inner side gasket, an outer side gasket and a central stand column. The platform base is provided with an inner side platform, a stand column platform and an outer side platform, and the stand column platform is located between the inner side platform and the outer side platform; the inner gasket is connected to the inner platform, the outer gasket is connected to the outer platform, and the central stand column is connected to the stand column platform; in the preset direction, the height of the outer side platform is larger than that of the inner side platform, and the inner side platform is flush with the stand column platform. The differentiated tibial plateau prosthesis system is matched with an artificial thighbone prosthesis for use, can effectively retain the bone mass of the proximal end of the tibia on the outer side of the knee joint, enables gaps between the inner side and the outer side of the knee joint which are originally large in difference to be balanced, reduces the requirement for releasing soft tissue on the inner side, avoids excessive releasing and stripping of the soft tissue of the knee joint, relieves the degree of postoperative pain, and improves the patient compliance. And the postoperative rehabilitation process is accelerated.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular, to a differentiated tibial platform prosthesis system. BACKGROUND

[0002] Although total knee arthroplasty is an effective surgical method for treating knee joint degeneration and other diseases, there is still a dissatisfaction rate of up to about 10-20%, and a relatively painful postoperative rehabilitation process. Many factors contribute to this adverse situation, excessive soft tissue release, stimulation, excessive bone resection can affect the stability and retention rate of the knee prosthesis, can cause the sinking and loosening of the knee platform prosthesis, and shorten the service life of the prosthesis, and excessive lateral platform bone resection also increases the difficulty of knee revision surgery.

[0003] During the operation, in order to solve the imbalance of the medial and lateral compartments of the knee joint, it is often necessary to release and cut the soft tissue including the medial collateral ligament, which increases the probability of postoperative pain and instability, and excessive pain increases the incidence of complications such as adhesion and poor mobility of the knee due to delayed rehabilitation. The current international mainstream knee prosthesis, especially the tibial platform prosthesis, is based on vertical force line tibial platform osteotomy, and the lateral platform osteotomy is about 6-12mm, which can obtain 0-4mm osteotomy of the medial platform, resulting in excessive loss of good proximal bone of the knee joint, weakening the support strength of the proximal tibia to the knee platform prosthesis.

[0004] Therefore, a new knee prosthesis system is needed to solve these problems, improve the effectiveness of such surgery, improve the satisfaction rate, reduce the incidence of complications, and prolong the service life of the prosthesis. SUMMARY

[0005] The purpose of the present application includes providing a differentiated tibial platform prosthesis system, which can reduce the amount of lateral platform osteotomy of the knee joint, more easily balance the medial and lateral gaps of the knee joint with greater difference, and reduce the need for medial soft tissue release.

[0006] Embodiments of the present application can be implemented as follows: The present application provides a differentiated tibial platform prosthesis system, which includes a platform base, an inner spacer, an outer spacer, and a central column; The platform base is configured with a medial platform, a column platform, and a lateral platform, the column platform is located between the medial platform and the lateral platform; the inner spacer is connected to the medial platform, the outer spacer is connected to the lateral platform, and the central column is connected to the column platform. Among them, along the preset direction, the height of the lateral platform is higher than the height of the medial platform, and the medial platform is flush with the column platform.

[0007] In an optional embodiment, the height difference between the outer platform and the inner platform is 2-10 mm in the preset direction.

[0008] In an optional embodiment, the inner spacer is movably connected to the inner platform, and the outer spacer is fixedly connected to the outer platform.

[0009] In an optional embodiment, the lower end surface of the inner spacer is a plane, the upper end surface of the inner spacer is a spherical surface, and the thickness of the inner spacer gradually increases from the front part to the rear part of the inner spacer; the lower end surface of the outer spacer is a plane, the upper end surface of the outer spacer is a spherical surface, and the thickness of the outer spacer gradually increases from the front part to the rear part of the outer spacer.

[0010] In an optional embodiment, the outer edge of the inner spacer and the outer edge of the outer spacer are both arc-shaped; the arc radius of the side edge of the front half of the inner spacer is smaller than the arc radius of the side edge of the rear half of the inner spacer; the arc radius of the side edge of the front half of the outer spacer is smaller than the arc radius of the outer edge of the rear half of the outer spacer. In an optional embodiment, the arc radius of the side edge of the front half of the inner spacer is smaller than the arc radius of the side edge of the front half of the outer spacer, and the arc radius of the side edge of the rear half of the inner spacer is smaller than the arc radius of the side edge of the rear half of the outer spacer.

[0011] In an optional embodiment, the inner part of the central column is provided with a reinforcing column in the preset direction, and the diameter of the reinforcing column is 3-6 mm.

[0012] In an optional embodiment, the column platform is provided with a connecting groove extending in a direction perpendicular to the preset direction; and the bottom of the central column is provided with a connecting part in sliding cooperation with the connecting groove.

[0013] In an optional embodiment, the connecting groove is a dovetail groove, and the connecting part has a shape suitable for the connecting groove.

[0014] In an optional embodiment, the bottom of the column platform is connected with a keel column; and in the preset direction, the diameter of the keel column gradually decreases in a direction away from the platform base.

[0015] In an optional embodiment, the differentiated tibial platform prosthesis system further comprises at least one connecting side wing connected to the keel column around the axis of the keel column and connected to the bottom surface of the inner platform, the outer platform, or the column platform. In an optional embodiment, the connecting side wing is provided with a pattern obliquely arranged thereon.

[0016] The differentiated tibial platform prosthesis system provided by the embodiments of the present application has the following beneficial effects: The differentiated tibial platform prosthesis system comprises a platform base, an inner side gasket, an outer side gasket and a central column; the platform base is configured with an inner side platform, a column platform and an outer side platform, and the column platform is located between the inner side platform and the outer side platform; the inner side gasket is connected to the inner side platform, the outer side gasket is connected to the outer side platform, and the central column is connected to the column platform; wherein, along a preset direction, the height of the outer side platform is higher than the height of the inner side platform, and the inner side platform is flush with the column platform. The differentiated tibial platform prosthesis system matches the artificial femoral prosthesis, can form a semi- mobile knee joint prosthesis with a height difference, can effectively retain the proximal tibial bone mass on the lateral side of the knee joint, that is, reduce the bone cutting amount of the lateral side of the knee joint, balance the inner and outer side gaps of the knee joint with originally large difference, reduce the need for soft tissue release on the inner side of the knee joint, avoid excessive release and stripping of the soft tissue of the knee joint, reduce the wear rate of the inner side gap of the knee joint, reduce the degree of postoperative pain, and speed up the postoperative rehabilitation process. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 The structure schematic diagram of the differentiated tibial platform prosthesis system in the first perspective of the present embodiment is provided. Figure 2 The structure schematic diagram of the differentiated tibial platform prosthesis system in the second perspective of the present embodiment is provided. Figure 3 The structure schematic diagram of the differentiated tibial platform prosthesis system in the third perspective of the present embodiment is provided. Figure 4 The exploded schematic diagram of the differentiated tibial platform prosthesis system of the present embodiment is provided. Figure 5 The cross-sectional view at the outer side platform of the present embodiment is provided. Figure 6 The cross-sectional view at the column platform of the present embodiment is provided. Figure 7 The structure schematic diagram of the platform base of the present embodiment is provided.

[0019] Icon: 100 - differentiated tibial platform prosthetic system; 200 - platform base; 300 - medial spacer; 400 - lateral spacer; 500 - central post; 201 - locking screw; 210 - medial platform; 220 - post platform; 230 - lateral platform; 231 - snap portion; 510 - reinforcing post; 221 - connecting slot; 600 - keel post; 110 - connecting wing. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0022] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0023] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0024] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0025] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0026] The inventor has found through research that most current knee joint deformities and pain are varus deformities and medial knee joint space pain symptoms, and there is a condition of medial soft tissue contracture and lateral relaxation. The current "one-size-fits-all" tibial plateau osteotomy mode makes the originally relaxed lateral space more relaxed, aggravates the medial-lateral imbalance, increases the need for large-area release of the medial space soft tissue, and thus increases postoperative joint pain, makes gap balancing more difficult, and further increases postoperative dissatisfaction.

[0027] Therefore, based on the above reasons, please refer to Figures 1-7 The embodiment provides a differentiated tibial plateau prosthesis system 100 which matches artificial femoral prosthesis use, can form a semi-active knee joint prosthesis with a height difference, can differentiate the medial-lateral compartment treatment on the basis of preserving the lateral bone mass, reduce postoperative pain, improve medial-lateral gap balancing, and can prolong the overall service life of the prosthesis, improve the effectiveness of such surgery, improve satisfaction, reduce the incidence of complications, and prolong the service life of the prosthesis.

[0028] Specifically, please refer to Figures 1-7 The differentiated tibial plateau prosthesis system 100 includes a platform base 200, a medial spacer 300, a lateral spacer 400, and a central column 500. The platform base 200 is configured with a medial platform 210, a column platform 220, and a lateral platform 230, and the column platform 220 is located between the medial platform 210 and the lateral platform 230. The medial spacer 300 is connected to the medial platform 210, the lateral spacer 400 is connected to the lateral platform 230, and the central column 500 is connected to the column platform 220. Among them, along the preset direction, the height of the lateral platform 230 is higher than the height of the medial platform 210, and the medial platform 210 is flush with the column platform 220.

[0029] Please refer to Figures 1-7 The working principle of the differentiated tibial plateau prosthesis system 100 is: Specifically, the differentiated tibial platform prosthesis system 100 comprises a platform base 200, an inner side gasket 300, an outer side gasket 400, and a central column 500; the platform base 200 is configured with an inner side platform 210, a column platform 220, and an outer side platform 230, and the column platform 220 is located between the inner side platform 210 and the outer side platform 230; the inner side gasket 300 is connected to the inner side platform 210, the outer side gasket 400 is connected to the outer side platform 230, and the central column 500 is connected to the column platform 220; wherein, along the preset direction, the height of the outer side platform 230 is higher than the height of the inner side platform 210, and the inner side platform 210 is flush with the column platform 220. Thus, the differentiated tibial platform prosthesis system 100 matches the artificial femoral prosthesis, and can form a semi- mobile knee joint prosthesis with a height difference, which can effectively retain the proximal tibial bone mass on the lateral side of the knee joint, that is, reduce the bone cutting amount of the lateral side platform 230 of the knee joint, balance the inner and outer side gaps of the knee joint with originally large difference, reduce the need for medial soft tissue release, avoid excessive release and stripping of the knee joint soft tissue, reduce the wear rate of the medial gap of the knee joint, reduce the degree of postoperative pain, and speed up the postoperative rehabilitation process.

[0030] It should be noted that in the present embodiment, the preset direction is the vertical direction.

[0031] From the above, in the present embodiment, the inner side platform 210 and the outer side platform 230 are arranged in a differentiated manner, so that when the platform base 200 is configured, a height difference is formed between the inner side platform 210 and the outer side platform 230, and the height difference between the outer side platform 230 and the inner side platform 210 can be 2-10 mm along the preset direction, wherein when adjusting the height difference, the adjustment distance can be 1 mm at a time.

[0032] Moreover, when the inner side gasket 300 and the outer side gasket 400 are configured, in order to enable the inner side gasket 300 and the outer side gasket 400 to be connected to the inner side platform 210 and the outer side platform 230 respectively, a structure for installing the inner side gasket 300 and the outer side gasket 400 is correspondingly provided on the inner side platform 210 and the outer side platform 230, and the connecting structure can be a groove structure; Moreover, the gaskets used in the total knee joint prosthesis at home and abroad at present are all the same polyethylene gaskets fixed on the platform, which to some extent loses the normal activity degree of the knee joint after surgery, such as torsion, rotation, and flexion, and affects part of the functional requirements after surgery; and the point-surface contact and friction mode also increases the long-term polyethylene wear after surgery, shortening the service life of the prosthesis; Based on this, please refer to Figures 1-7, the inner side gasket 300 can be movably connected to the inner side platform 210, and the outer side gasket 400 is fixedly connected to the outer side platform 230, that is, the outer side gasket 400 is relatively fixed after being connected to the outer side platform 230, and the inner side platform 210 is movable relative to the inner side platform 210 after being connected to the inner side platform 210. Moreover, when the outer side gasket 400 is installed, the clamping portion 231 is arranged in the groove-shaped portion of the outer side platform 230, so that the outer side gasket 400 is relatively fixed after being installed. The semi-movable platform gasket design reduces the wear rate of polyethylene, prolongs the service life of the prosthesis, and prevents the complication of gasket dislocation. The design can effectively prevent gasket dislocation, reduce the volume wear rate, and prolong the service life of the prosthesis.

[0033] Moreover, when the inner side gasket 300 is arranged, the lower end surface of the inner side gasket 300 is a plane, the upper end surface is a spherical surface, and the thickness of the inner side gasket 300 gradually increases from the front portion to the rear portion. The lower end surface of the outer side gasket 400 is a plane, the upper end surface is a spherical surface, and the thickness of the outer side gasket 400 gradually increases from the front portion to the rear portion.

[0034] Moreover, the thickness of the inner side gasket 300 is 3-14 mm, and the thickness increases by 1 mm. The top of the inner side gasket 300 is a spherical arc surface, the bottom is a smooth surface, the front portion is thicker than the rear portion, and the upper portion of the front portion is inclined. The thickness of the outer side gasket 400 is 3-10 mm, and the thickness increases by 1 mm. In the above manner, better adaptation and installation are achieved, and the outer side edges of the inner side gasket 300 and the outer side gasket 400 are arc-shaped. The arc radius of the side edge of the front half of the inner side gasket 300 is smaller than that of the rear half. The arc radius of the side edge of the front half of the outer side gasket 400 is smaller than that of the rear half. The arc radius of the side edge of the front half of the inner side gasket 300 is smaller than that of the front half of the outer side gasket 400, and the arc radius of the side edge of the rear half of the inner side gasket 300 is smaller than that of the rear half of the outer side gasket 400.

[0035] Please refer to Figures 1-7In the configuration of the central column 500, the central column 500 is fixedly connected to the column platform 220 by the locking screw 201; the front part of the central column 500 is vertical, and the rear part is arc-shaped, and the upper end is provided with a beveled notch; and in order to increase the structural strength of the central column 500, therefore, a reinforcing column 510 is arranged inside the central column 500 in a predetermined direction, and the diameter of the reinforcing column 510 is 3-6 mm. Moreover, in the installation of the column platform 220, the column platform 220 can be provided with a connecting groove 221, and the connecting groove 221 extends in a direction perpendicular to the predetermined direction; and the bottom of the central column 500 is provided with a connecting part in sliding fit with the connecting groove 221. Thus, the connection of the central column 500 can be simplified, and in the configuration of the connecting groove 221, since the central column 500 is located between the inner gasket 300 and the outer gasket 400, and the column platform 220 is located between the inner platform 210 and the outer platform 230, therefore, the groove-shaped side wall can also play a role in separating the outer platform 230 from the column platform 220, and separating the inner platform 210 from the column platform 220, and in the arrangement of the connecting groove 221, in order to improve the connection stability of the central column 500, therefore, the connecting groove 221 is a dovetail groove, and the connecting part has a shape suitable for the connecting groove 221.

[0036] Further, please refer to Figures 1-7 In the installation of the platform base 200, in order to enable it to be connected with the tibia, therefore, the column platform 220 is provided with a keel column 600 connected to the bottom of the column platform 220; and in the predetermined direction, the diameter of the keel column 600 gradually decreases in the direction away from the platform base 200.

[0037] Moreover, in order to improve the structural strength of the differentiated tibial platform prosthesis system 100, therefore, the differentiated tibial platform prosthesis system 100 further comprises at least one connecting side wing 110 connected to the keel column 600 around the axis of the keel column 600, and connected to the bottom surface of the inner platform 210, the outer platform 230 or the column platform 220; wherein the connecting side wing 110 is provided with a pattern arranged obliquely thereon.

[0038] In summary, please refer to Figures 1-7 The differentiated tibial platform prosthesis system 100 provided by the embodiment comprises a platform base 200, an inner gasket 300, an outer gasket 400 and a central column 500. The platform base 200 is made of metal or alloy, and the upper surface is a polished smooth surface; and can be divided into an outer platform 230, an inner platform 210 and a column platform 220, wherein the inner platform 210 and the column platform 220 are flush and lower, and the outer platform 230 is higher, forming a height difference of 2-10 mm with the inner platform 210 and the column platform 220, and can increase by 1 mm, so that the cross section of the platform base 200 is Z-shaped.

[0039] The central post 500 is installed in a dovetail groove structure, so that the side walls of the dovetail groove are formed as high metal partition walls at the junctions of the post platform 220 with the inner platform 210 and the post platform 220 with the outer platform 230, and the partition walls are in the shape of "J" in cross section due to the dovetail groove of the connecting groove 221; The bottom of the post platform 220 is provided with a cylindrical keel 600, and the bottom surface of the platform base 200 is provided with a plurality of connecting flaps 110 connected with the keel 600 around the axis of the keel 600 and connected with the bottom surface of the inner platform 210, the outer platform 230 and the post platform 220 respectively, and each of the connecting flaps 110 is provided with inclined lines. Thus, the two connecting flaps 110 are distributed on the front and back sides of the keel 600, and the connecting flaps 110 connected with the inner platform 210 and the outer platform 230 are distributed on the two sides of the keel 600, and the connecting flaps 110 connected with the inner platform 210 are located at the lower 1 / 3 of the outer platform 230 close to the post platform 220, and the connecting flaps 110 connected with the outer platform 230 are located at the lower 1 / 3 of the outer platform 230 close to the post platform 220. It should be noted that the connecting flaps 110 can be triangular and provided with inclined lines. It should be noted that when the keel 600 is provided, the distal end of the keel 600 can be a tapered semi-cylindrical hollow space with a trapezoidal cross section, and the opening of the port can be closed by a button-type polyethylene cap with an arc-shaped surface and shallow grooves.

[0040] The inner gasket 300, the outer gasket 400 and the central post 500 are made of polyethylene, the top of the central post 500 is convex, the edges are round and blunt, the front is vertical, the back is arc-shaped, and the upper end is provided with an inclined notch. The bottom width of the central post 500 is equal to the width of the post platform 220, and the central post 500 can be embedded in the post platform 220 through the connecting groove 221. There is a metal reinforcing column 510 with a diameter of 3-6 mm in the central post 500 along the axis. The two sides of the bottom of the central post 500 are provided with shallow grooves from front to back.

[0041] The above structure is matched with the corresponding artificial femoral prosthesis for use, which can easily balance the gap between the lateral compartment and the medial compartment, retain the lateral tibial bone mass, and reduce the need for medial soft tissue release.

[0042] Thus, the differentiated tibial platform prosthesis system 100 is implanted into the knee joint tibial plateau by the implanting instrument, matched with the corresponding artificial femoral prosthesis, the bone mass of the originally loose lateral gap is effectively reserved, the degree of medial soft tissue release and irritation is reduced, and postoperative pain is reduced; the central column 500 ensures the stability in the front and back directions of the knee joint, the medial movable gasket can effectively reduce the wear of the interface, and the service life of the prosthesis is prolonged.

[0043] When applied, refer to Figures 1-7 The specific steps are as follows: First, the surface preparation of the knee joint femoral side is performed by using a measuring and bone cutting tool, the size of the femoral prosthesis and the bone cutting amount are determined, and the joint line level of the posterior condyle is determined; the medial and lateral menisci, and the anterior and posterior cruciate ligaments are removed, and the proximal tibial surface is exposed; the medial and lateral diameters of the proximal tibial surface are measured, and the appropriate size of the tibial platform prosthesis is evaluated; according to the size of the tibial platform prosthesis, the junction line of the lateral platform 230 and the column platform 220 is determined; The subchondral level of the lateral joint is measured by using a special tibial force line alignment tool and a bone cutting thickness measuring tool, and the subchondral horizontal bone cutting of the lateral compartment is performed perpendicular to the tibial force line, and the bone cutting block is removed; The wear level of the medial compartment is evaluated, and appropriate limited knee joint medial soft tissue sleeve release is performed. The subchondral level of 1-2mm of the worn cartilage is determined as the bone cutting level of the medial compartment; and the height difference between the lateral platform 230 and the medial platform 210 / column platform 220, and the appropriate size of the final differentiated tibial platform prosthesis system 100 is selected according to the height difference; The reciprocating saw blade is used to perform vertical bone cutting along the anteroposterior axis of the tibial platform at the junction line of the lateral platform 230 and the column platform 220, and the depth reaches the height difference between the lateral platform 230 and the column platform 220, and the height difference between the medial platform 210 and the column platform 220; The reciprocating saw blade is retained at the vertical bone cutting position to protect the lateral bone of the tibial platform; the subchondral horizontal bone cutting of the medial compartment and the column platform 220 is performed perpendicular to the tibial force line, and the bone cutting block is removed; The selected tibial platform prosthesis trial of appropriate size is placed on the tibial platform bone cutting surface, and the femoral prosthesis trial is placed; the fixed lateral gasket 400 trial of appropriate thickness is selected and placed on the lateral platform 230; the central column 500 is placed on the column platform 220 and temporarily locked and fixed; The movable medial gasket 300 trial of appropriate thickness is selected and pushed into the medial compartment to reset the knee joint; Move the knee joint, test the moving track of the medial spacer 300, and whether there is a dislocation tendency; test the tension of the medial and lateral soft tissues of the knee joint, and the tightness of the medial and lateral compartments, the range of motion of the knee joint, and other parameters, and adjust the thickness of the medial spacer 300 and the lateral spacer 400 as necessary until satisfactory; Then remove all the test molds, place the keel preparation platform test mold on the platform bone surface, place the column platform 220 sleeve, drill the hole of the keel column 600 with a rough drill bit, and knock the connecting flange 110 into the preparation of the keel column 600; Then knock the connecting flange 110 into the connecting flange 110 groove on the outer platform 230 and the inner platform 210 test mold, and prepare three keels; If a tibial prosthesis extension rod is needed, remove the polyethylene cap at the distal end of the keel column 600, and knock the extension rod into the distal end of the keel column 600 to lock it.

[0044] Rinse the femoral and tibial bone cutting surfaces and joint cavities, dry the bone surfaces, and mix the bone cement. Apply the bone cement to the bone surface and the platform base 200 bottom surface, knock the platform base 200 into the platform bone surface to complete the compaction, and remove the excess bone cement; Then apply the bone cement to the back of the femoral prosthesis and the femoral bone surface, place the femoral prosthesis, and remove the excess bone cement; Push the central column 500 into the platform base 200 column platform 220, and make its rear part enter the column platform 220 metal spacing part; knock the front of the central column 500 to make the central column 500 completely enter the column platform 220; Then push the lateral spacer 400 of the appropriate thickness into the lateral platform 230 in the same way, and knock it in; Then push the selected medial movable spacer of the appropriate thickness into the medial platform 210; Reset the movable knee joint and remove the excess bone cement; Complete the installation process.

[0045] In summary, the differentiated tibial platform prosthesis system 100 has the following advantages: The differentiated design of the differentiated tibial platform prosthesis system 100 reduces the amount of bone cutting on the lateral gap platform, and the remaining bone mass facilitates future revision procedures; At the same time, most of the knee deformity is varus deformity, there is medial platform 210 wear, soft tissue contracture tension, lateral gap relaxation, lateral soft tissue is more normal relaxation. The traditional total knee arthroplasty is to take the mode of "one size fits all", the lateral platform 230 bone cutting amount is 9-11mm, the medial bone cutting amount is smaller, 0-6mm, which makes the lateral relaxed joint space more increased, increases the difficulty of medial and lateral gap balance, and more medial soft tissue release, irritation, extension is needed to make the medial and lateral soft tissue balanced, which will increase the postoperative pain and discomfort of patients, delay the postoperative rehabilitation process, increase the postoperative dissatisfaction rate and medial pain, and the probability of complications.

[0046] And the differentiated tibial platform prosthesis system 100 provided by the embodiment compensates for these defects through differentiated design, reduces the lateral tibial platform bone cutting amount under the premise of ensuring the medial bone cutting amount and lower limb alignment, tightens the originally relaxed lateral gap, so that the lateral spacer 400 gap does not need to be 8-12mm thick as in the traditional; At the same time, it avoids the excessive release and cutting of the medial soft tissue that must be implemented, thereby reducing the postoperative knee pain, accelerating the postoperative rehabilitation process, and reducing the risk of knee adhesion and dysfunction.

[0047] And the differentiated tibial platform prosthesis system 100 can use polyethylene spacers of different thicknesses in the medial and lateral compartments of the knee joint, and does not have to adjust to the uniform thickness spacers of the traditional prosthesis. The personalized spacer thickness can obtain more ideal medial and lateral compartment tension and stability. The medial and lateral gaps are more easily balanced, so that the postoperative knee lateral gap does not need to tolerate 1-6mm relaxation, and by using relatively thin polyethylene spacers, the medial and lateral compartments can obtain ideal balance, avoiding the risk of postoperative flexion instability, abnormal lower limb alignment, and reduced quadriceps muscle strength.

[0048] The keel post 600 replaces the function of the anterior cruciate ligament, avoiding instability in the anterior-posterior direction of the knee joint, resulting in a good postoperative gait and ensuring good range of motion of the knee joint. Compared with the traditional spacer post, the keel post 600 has a relatively narrow width, reducing the restrictiveness of the cam-post design and allowing greater rotational movement between the femoral prosthesis and the tibial prosthesis; the metal post along the central axis of the central post 500 enhances the overall strength of the keel post 600, reducing the risk of polyethylene post fracture and wear. The medial compartment spacer in the knee joint can slide in the anterior-posterior direction on the medial platform 210 with a high boundary, as well as a certain degree of medial-lateral rotation, and the high boundary can effectively prevent the dislocation risk of the mobile spacer; the smooth surface of the medial platform 210 and the mobile spacer design reduce the wear coefficient between the medial compartment prosthesis components of the knee joint, prolonging the service life of the prosthesis. The lateral spacer 400 is non-mobile and embedded in the lateral platform 230, avoiding the risk of dislocation of the lateral spacer 400 due to the axial movement pattern of the knee joint. The tapered space reserved inside the distal end of the keel post 600 facilitates the connection of the extension rod that may be required. The triangular keel wings below the lateral platform 230 and the medial platform 210, as well as the diagonal side wings of the keel post 600, can effectively improve the overall rotational resistance.

[0049] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1.A differentiated tibial platform prosthesis system, characterized in that: the differentiated tibial platform prosthesis system comprises a platform base, a medial spacer, a lateral spacer and a central column; the platform base is configured with a medial platform, a column platform and a lateral platform, the column platform is located between the medial platform and the lateral platform; the medial spacer is connected to the medial platform, the lateral spacer is connected to the lateral platform, and the central column is connected to the column platform; wherein, along a predetermined direction, the height of the lateral platform is higher than the height of the medial platform, and the medial platform is flush with the column platform. 2.The differentiated tibial platform prosthesis system according to claim 1, characterized in that: along the predetermined direction, the height difference between the lateral platform and the medial platform is 2-10 mm. 3.The differentiated tibial platform prosthesis system according to claim 1, characterized in that: the medial spacer is movably connected to the medial platform, and the lateral spacer is fixedly connected to the lateral platform. 4.The differentiated tibial platform prosthesis system according to claim 1, characterized in that: the lower end surface of the medial spacer is a plane, the upper end surface thereof is a spherical surface, and the thickness of the medial spacer gradually increases from the front to the back thereof; the lower end surface of the lateral spacer is a plane, the upper end surface thereof is a spherical surface, and the thickness of the lateral spacer gradually increases from the front to the back thereof. 5.The differentiated tibial platform prosthesis system according to claim 1, characterized in that: the lateral edges of the medial spacer and the lateral spacer are arc-shaped; the lateral edge arc radius of the front half of the medial spacer is smaller than that of the back half thereof; the lateral edge arc radius of the front half of the lateral spacer is smaller than that of the back half thereof; wherein, the lateral edge arc radius of the front half of the medial spacer is smaller than that of the front half of the lateral spacer, and the lateral edge arc radius of the back half of the medial spacer is smaller than that of the back half of the lateral spacer. 6.The differentiated tibial platform prosthesis system according to claim 1, characterized in that: a reinforcing column is arranged inside the central column along the predetermined direction, and the diameter of the reinforcing column is 3-6 mm. 7.The differentiated tibial platform prosthesis system according to claim 1, characterized in that: the column platform is provided with a connecting groove extending in a direction perpendicular to the predetermined direction; and the bottom of the central column is provided with a connecting portion in sliding fit with the connecting groove. 8.The differentiated tibial platform prosthesis system according to claim 7, characterized in that: the connecting groove is a dovetail groove, and the connecting portion has a shape suitable for the connecting groove. 9.The differentiated tibial platform prosthesis system according to any one of claims 1-8, characterized in that: the bottom of the column platform is connected with a keel column; along the predetermined direction, the diameter of the keel column gradually decreases in a direction away from the platform base. 10.The differentiated tibial platform prosthesis system according to claim 9, characterized in that: The differential tibial platform prosthesis system further comprises at least one connecting side wing connected with the keel column around the axis of the keel column and connected with the bottom surface of the medial platform, the lateral platform or the column platform; Wherein, the connecting side wing is obliquely arranged with a texture.

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