Metal 3D printing porous bone induction structure tibial prosthesis

Abstract

The utility model discloses a metal 3D printing porous bone induction structure tibial prosthesis, which comprises a diaphysis prosthesis, a bone fracture plate and an intramedullary nail, the diaphysis prosthesis is designed according to the anatomical form of the focus part of a patient, the diaphysis prosthesis comprises a solid framework and a porous structure, and a cavity is arranged in the diaphysis prosthesis; the at least two bone fracture plates are connected to the two ends of the diaphysis prosthesis in the tibia direction respectively, and the at least two bone fracture plates are connected with the tibia near end and the tibia far end through screws respectively. The tibia near end comprises a first medullary cavity, the tibia far end comprises a second medullary cavity, the intramedullary nail penetrates through the first medullary cavity, the cavity and the second medullary cavity, and the two ends of the intramedullary nail are connected with the tibia near end and the tibia far end through screws respectively. The utility model can solve the problems of incapability of realizing rapid healing, poor initial stability and poor long-term stability in the existing bone defect reconstruction.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, and specifically relates to a metal 3D printed porous bone-inducing structure tibial prosthesis. Background Technology

[0002] The tibia, an important weight-bearing bone in the human body, is a major component of the lower limbs and is responsible for supporting weight-bearing walking. Due to various reasons such as fractures, infections, or joint diseases, patients may experience partial or complete damage to the tibia.

[0003] Current treatments for the tibia include bone grafting, bone transport surgery, bone induction, and bone formation. However, these treatments all have drawbacks such as long treatment cycles, slow healing, a certain recurrence rate, and the risk of infection.

[0004] Therefore, in this case, bone defect reconstruction suffers from technical defects that prevent rapid healing and ensure good initial and long-term stability, which has become a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a metal 3D printed porous bone-inducing structure tibial prosthesis to solve the technical problems of bone defect reconstruction in the prior art, such as the inability to achieve rapid healing, poor initial stability, and poor long-term stability.

[0006] The technical solution adopted to solve the above-mentioned technical problems is as follows:

[0007] This utility model discloses a metal 3D printed porous bone-inducing structure tibial prosthesis, comprising:

[0008] A skeletal prosthesis, designed according to the anatomical morphology of the patient's lesion site, the skeletal prosthesis includes a solid frame and a porous structure, and the skeletal prosthesis has a cavity inside;

[0009] Bone plates, at least two of which are respectively connected to both ends of the bone shaft prosthesis along the tibial direction, and at least two of the bone plates are respectively connected to the proximal and distal tibial screws;

[0010] An intramedullary nail has a first medullary canal at the proximal end of the tibia and a second medullary canal at the distal end of the tibia. The intramedullary nail passes through the first medullary canal, the cavity, and the second medullary canal. The two ends of the intramedullary nail are respectively connected to the proximal and distal tibial screws.

[0011] The beneficial effects of this invention are at least as follows: the bone prosthesis is designed according to the anatomical morphology of the patient's lesion site, ensuring that the shape of the bone prosthesis matches the anatomical morphology of the lesion site, allowing for better and more precise replacement of the patient's bone defect. The bone prosthesis comprises a solid frame and a porous structure, giving it better axial load-bearing capacity and better resistance to tibial stress. The porous structure not only reduces the weight of the 3D-printed porous bone-inducing tibial prosthesis, enabling a lightweight design and reducing stress shielding, but also promotes the growth of bone tissue, osteocytes, and blood vessels within it, accelerating healing.

[0012] The prosthesis has bone plates at both ends along the tibia. The two ends of the prosthesis are connected to the proximal and distal ends of the tibia by screws through the bone plates, so that the prosthesis is stably installed between the proximal and distal ends of the tibia.

[0013] The prosthesis contains a cavity, and an intramedullary nail is inserted into the first medullary cavity, the cavity, and the second medullary cavity. The two ends of the intramedullary nail are connected to the proximal and distal tibial screws, respectively, so that the intramedullary nail can share the stress of the tibia, maintain the axial fixation of the tibia, and reduce lateral stress. This gives the metal 3D printed porous bone-inducing structure tibial prosthesis good stability on the tibia, ensuring the initial and long-term stability of the reconstructed site after surgery, allowing patients to have good knee joint function, and reducing the difficulty and risk of surgery.

[0014] As a further improvement to the above technical solution, the bone prosthesis is provided with an observation window communicating with the cavity, and the intramedullary nail is provided with a positioning platform, with the observation window and the positioning platform being linearly corresponding.

[0015] As a further improvement to the above technical solution, the metal 3D printed porous bone-inducing tibial prosthesis also includes multiple transverse locking screws, some of which are threaded through the proximal tibia and the intramedullary nail, and the other part of which are threaded through the distal tibia and the intramedullary nail.

[0016] As a further improvement to the above technical solution, the bone plate is provided with locking screw holes and locking screws, and the locking screws are connected to the proximal or distal tibia after being inserted into the locking screw holes.

[0017] As a further improvement to the above technical solution, the locking screw includes a first thread located on the screw head portion and a second thread located on the screw shaft portion. The first thread engages with the locking screw hole thread, and the second thread connects to the proximal or distal tibia.

[0018] As a further improvement to the above technical solution, the two ends of the bone prosthesis facing the proximal and distal ends of the tibia are respectively connected to two oppositely arranged bone plates, and each bone plate is provided with two locking screw holes spaced apart along the tibial direction.

[0019] As a further improvement to the above technical solution, the bone prosthesis and the bone plate are integrally formed.

[0020] As a further improvement to the above technical solution, the porous structure is a tetrahedral structure.

[0021] As a further improvement to the above technical solution, the porosity of the porous structure is 60% to 85%.

[0022] As a further improvement to the above technical solution, the diameters at both ends of the cavity are adapted to the diameters of the first medullary cavity and the second medullary cavity, respectively. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0024] Figure 1 This is a schematic diagram of the assembly structure of the metal 3D printed porous bone-inducing structure tibial prosthesis provided in this embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the assembly structure of the metal 3D printed porous bone-inducing tibial prosthesis provided in this embodiment of the present invention from another perspective.

[0026] Figure 3 This is a schematic diagram of the structure of the skeletal prosthesis provided in this embodiment of the present invention;

[0027] Figure 4 This is a structural schematic diagram of the skeletal prosthesis provided in another embodiment of the present invention;

[0028] Figure 5 This is a cross-sectional view of the skeletal prosthesis provided in this embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the intramedullary nail structure provided in this embodiment of the utility model;

[0030] Figure 7 This is a schematic diagram of the structure of the locking screw provided in this embodiment of the utility model;

[0031] Figure 8 This is a schematic diagram of the structure of the horizontal locking nail provided in this embodiment of the utility model.

[0032] The following labels are shown in the attached diagram:

[0033] 100. Metal 3D Printed Porous Bone-Inducing Structure Tibial Prosthesis;

[0034] 200. Skeletal prosthesis; 210. Solid frame; 220. Porous structure; 230. Cavity; 240. Observation window;

[0035] 300, bone plate; 310, locking screw hole; 320, locking screw; 321, first thread; 322, second thread;

[0036] 400. Proximal tibia; 410. First medullary canal;

[0037] 500. Distal tibia; 510. Second medullary canal;

[0038] 600. Intramedullary nail; 610. Positioning platform;

[0039] 700, horizontal locking pin. Detailed Implementation

[0040] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0041] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] In the description of this utility model, the use of terms such as "several" means one or more, with "multiple" meaning two or more. Terms like "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of terms like "first," "second," and "third" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, the quantity of indicated technical features, or the sequential relationship between indicated technical features.

[0043] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0044] Reference Figures 1 to 8The following are several embodiments of the metal 3D printed porous bone-inducing structure tibial prosthesis of this utility model.

[0045] like Figures 1 to 8 As shown, the metal 3D printed porous bone-inducing structure tibial prosthesis 100 of this utility model embodiment includes a bone shaft prosthesis 200, a bone plate 300, and an intramedullary nail 600.

[0046] Understandably, the shape of the bone prosthesis 200 is designed according to the anatomical morphology of the patient's lesion site. The bone prosthesis 200 includes a solid frame 210 generated after topology optimization and a porous structure 220, such as... Figures 1 to 5 As shown, the solid frame 210 and porous structure 220 can better withstand tibial stress, enabling the 3D-printed porous bone-inducing tibial prosthesis 100 to stably support the patient's daily activities. The porous structure 220 can reduce the weight of the bone shaft prosthesis 200, thereby reducing the weight of the 3D-printed porous bone-inducing tibial prosthesis 100, reducing stress shielding, and promoting bone tissue growth and angiogenesis.

[0047] Understandably, the bone prosthesis 200 is manufactured using 3D printing additive manufacturing methods. Specifically, based on computed tomography (CT) or magnetic resonance imaging (MRI) data of the extent of lesion invasion, a 3D-printed personalized bone prosthesis 200 is designed for placement in the patient's leg. Simultaneously, topology optimization is performed by applying physiological loads using finite element method to determine the main stress-bearing solid frame 210, while porous structures 220 are generated for other parts outside the stress-bearing components, enabling a lightweight design for the bone prosthesis 200.

[0048] It is understandable that at least two bone plates 300 are provided and respectively connected to both ends of the bone shaft prosthesis 200 along the tibial direction, that is, the bone plates 300 extend from the bone shaft prosthesis 200 towards the tibia, such as... Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown. At least two bone plates 300 are connected to the proximal tibial plate 400 and the distal tibial plate 500 respectively by screws, that is, the metal 3D printed porous bone-inducing structure tibial prosthesis 100 is connected between the proximal tibial plate 400 and the distal tibial plate 500.

[0049] Understandably, the bone prosthesis 200 contains a cavity 230 for the insertion of the intramedullary nail 600, such as... Figures 3 to 5 As shown. Because the human tibia contains a medullary cavity, specifically the proximal tibia 400 includes a first medullary cavity 410, and the distal tibia 500 includes a second medullary cavity 510, as... Figure 1 and Figure 2As shown, when a patient has a bone defect, if a metal 3D-printed porous bone-inducing structure tibial prosthesis 100 is connected between the proximal tibial 400 and the distal tibial 500, then the first medullary cavity 410, the cavity 230 and the second medullary cavity 510 form the patient's complete tibial medullary cavity.

[0050] Understandably, the intramedullary nail 600 penetrates from the proximal tibial bone 400, and is sequentially inserted into the first medullary canal 410 of the proximal tibial bone 400, the cavity 230 of the bone shaft prosthesis 200, and the second medullary canal 510 of the distal tibial bone 500. The proximal and distal ends of the intramedullary nail 600 are connected to screws at the proximal tibial bone 400 and the distal tibial bone 500, respectively, thus fixing the intramedullary nail 600 to the patient's original bone. The intramedullary nail 600 plays a role in stress distribution, such as... Figure 1 and Figure 2 As shown.

[0051] Understandably, before installing the intramedullary nail 600, it is necessary to use instruments such as a medullary opener to make an opening at the knee position of the proximal tibial 400 so that the intramedullary nail 600 can be driven into the first medullary cavity 410, the cavity 230 and the second medullary cavity 510 sequentially from the knee position of the proximal tibial 400 through the guide pin.

[0052] Understandably, because some areas of the medullary cavity are relatively small, which is not conducive to the insertion of the intramedullary nail 600, when making an opening at the proximal 400 of the tibia below the knee, it is necessary to use tools such as medullary reamers to enlarge the medullary cavity before inserting the intramedullary nail 600.

[0053] This design, using 3D printing additive manufacturing to create a personalized metal 3D-printed porous bone-inducing structure tibial prosthesis 100, ensures that the shape of the metal 3D-printed porous bone-inducing structure tibial prosthesis 100 is identical to the anatomical morphology of the patient's lesion site. The bone shaft prosthesis 200 includes a solid frame 210 and a porous structure 220, giving it good axial load-bearing capacity, but poor resistance to lateral forces. This may lead to stress fracture at the connection point between the bone plate 300 and the bone shaft prosthesis 200, and the risk of connection failure between the bone plate 300 and the patient's tibia.

[0054] To address this, the bone prosthesis 200 has a cavity 230. One end of the intramedullary nail 600 passes through the cavity 230 and is fixed to the proximal tibial bone 400 within the first medullary cavity 410. The other end of the intramedullary nail 600 passes through the cavity 230 and is fixed to the distal tibial bone 500 within the second medullary cavity 510. This allows the intramedullary nail 600 to further maintain the axial fixation of the tibia, reduce lateral stress, and enable the 3D-printed porous bone-inducing structure tibial prosthesis 100 to have better stability on the tibia. Furthermore, it allows for more precise surgery, significantly reducing surgical difficulty and risk, shortening surgical time, and promoting better patient recovery. It ensures good stability of the reconstructed bone defect site in both the initial and long-term postoperative states, guaranteeing good knee joint function after surgery and enabling normal walking after rehabilitation training.

[0055] Understandably, the metal 3D-printed porous bone-inducing tibial prosthesis 100 can also avoid the high medical costs, multiple surgeries required for patients, and the potential for immune reactions due to the biocompatibility of some biomaterials and growth factors that may occur in traditional bone treatment methods.

[0056] Understandably, the bone prosthesis 200 is equipped with an observation window 240, which communicates with the cavity 230, such as... Figure 5 As shown. The observation window 240 is designed to provide space for the positioning instruments to work with the intramedullary nail 600 in the cavity 230 during the operation, thereby enabling precise distal placement of the intramedullary nail 600 and making the metal 3D printed porous bone-inducing structure tibial prosthesis 100 more stable.

[0057] Understandably, the intramedullary nail 600 is equipped with a positioning platform 610, such as... Figure 1 and Figure 6 As shown, after the intramedullary nail 600 penetrates the cavity 230, the observation window 240 and the positioning platform 610 are in a straight line correspondence. Specifically, the observation window 240 extends along the axial direction perpendicular to the bone shaft prosthesis 200. The positioning platform 610 extends along the axial direction perpendicular to the intramedullary nail 600.

[0058] Thus, after the intramedullary nail 600 penetrates the first medullary cavity 410, the cavity 230, and the second medullary cavity 510, a positioning instrument can be used to pass through the observation window 240 of the bone shaft prosthesis 200, thereby directly contacting the positioning platform 610 of the intramedullary nail 600, so that the intramedullary nail 600 and the bone shaft prosthesis 200 are relatively fixed, thereby facilitating the connection of the intramedullary nail 600 with the proximal tibial 400 and the distal tibial 500 screws.

[0059] It is understandable that the observation window 240 is greater than or equal to the positioning platform 610 to ensure that the positioning device passes through the observation window 240 and reaches the positioning platform 610.

[0060] Understandably, since the metal 3D printed porous bone-inducing tibial prosthesis 100 is reconstructed in three dimensions from the patient's CT or MRI data, the position of the observation window 240 is determined from the position of the positioning platform 610 after the bone prosthesis 200 and the intramedullary nail 600 are assembled and installed in the specified position during the simulated surgery. The observation window 240 is obtained by opening a window in the bone prosthesis 200 corresponding to the positioning platform 610.

[0061] Understandably, the metal 3D-printed porous bone-inducing tibial prosthesis 100 also includes multiple transverse locking screws 700, such as... Figure 1 , Figure 2 and Figure 8 As shown. A portion of the transverse locking screws 700 are threaded through the proximal tibial 400 and the intramedullary nail 600, thereby achieving connection and fixation between the proximal tibial 400 and the intramedullary nail 600; another portion of the transverse locking screws 700 are threaded through the distal tibial 500 and the intramedullary nail 600, thereby achieving connection and fixation between the distal tibial 500 and the intramedullary nail 600, thus improving the stability of the metal 3D-printed porous bone-inducing structure tibial prosthesis 100, such as... Figure 1 and Figure 2 As shown.

[0062] Understandably, the bone plate 300 is equipped with matching locking screw holes 310 and locking screws 320, such as... Figure 1 and Figure 2 As shown. Specifically, the locking screw 320 of the bone plate 300 facing the proximal tibia 400 passes through the locking screw hole 310 and is threaded into the proximal tibia 400, fixing the proximal tibia 400 and the bone plate 300 together. That is, the bone shaft prosthesis 200 is relatively fixed to the proximal tibia 400 through the bone plate 300 and the locking screw 320. Similarly, the locking screw 320 of the bone plate 300 facing the distal tibia 500 passes through the locking screw hole 310 and is threaded into the distal tibia 500, fixing the distal tibia 500 and the bone plate 300 together. That is, the bone shaft prosthesis 200 is relatively fixed to the distal tibia 500 through the bone plate 300 and the locking screw 320.

[0063] Furthermore, the locking screw 320 includes a first thread 321 located on the screw head portion and a second thread 322 located on the screw shank portion, as shown below. Figure 7 As shown. The first thread 321 engages with the locking screw hole 310 on the bone plate 300, and the second thread 322 is used for threaded connection of the proximal tibial end 400 or the distal tibial end 500.

[0064] Therefore, when the bone plate 300 is connected to the proximal tibial 400 or the distal tibial 500, the screw portion directly passes through the locking screw hole 310, and the second thread 322 abuts against and is screwed into the proximal tibial 400 or the distal tibial 500 until the first thread 321 of the screw head portion is threaded into the locking screw hole 310, so that the locking screw 320 is stably connected to the bone plate 300 and the proximal tibial 400 or the distal tibial 500, thereby reinforcing the connection between the metal 3D printed porous bone-inducing structure tibial prosthesis 100 and the proximal tibial 400 and the distal tibial 500, and preventing the locking screw 320 from loosening and thus affecting the axial load-bearing capacity of the metal 3D printed porous bone-inducing structure tibial prosthesis 100.

[0065] In some embodiments, the skeletal prosthesis 200 is provided with a bone plate 300 at each end along the tibial direction, making the connection between the metal 3D printed porous bone-inducing structure tibial prosthesis 100 and the tibia simple and quick to install.

[0066] In other embodiments, the bone prosthesis 200 has multiple bone plates 300 at both ends along the tibial direction. The multiple bone plates 300 are spaced apart in the axial direction of the tibia, so that one end of the bone prosthesis 200 is stably connected to the tibia through the multiple bone plates 300. This effectively increases the contact between the metal 3D printed porous bone-inducing structure tibial prosthesis 100 and the proximal 400 and distal 500 of the tibia, thereby effectively preventing the metal 3D printed porous bone-inducing structure tibial prosthesis 100 from rotating after implantation into the tibia, and further improving the overall stability of the metal 3D printed porous bone-inducing structure tibial prosthesis 100 after implantation.

[0067] In this embodiment, the bone prosthesis 200 has two bone plates 300 at each end along the tibial direction, such as... Figure 1 and Figure 3 As shown, two bone plates 300 are positioned opposite each other and connected to the proximal tibial 400 or the distal tibial 500. That is, one end of the bone shaft prosthesis 200 is connected to the opposite sides of the proximal tibial 400 or the distal tibial 500 through the two bone plates 300, thereby reducing the installation time while ensuring the axial stress of the tibial bone.

[0068] Understandably, each bone plate 300 is provided with two locking screw holes 310, such as... Figures 3 to 5 As shown. Specifically, the two locking screw holes 310 are spaced apart along the tibia, so that the two locking screws 320 connect the bone plate 300 to the proximal 400 or distal 500 of the tibia from different positions, thereby improving the stability of the metal 3D printed porous bone-inducing structure tibial prosthesis 100 with the tibia.

[0069] Understandably, the bone prosthesis 200 and the bone plate 300 can be fixedly connected by screws, welding, or other connection methods.

[0070] In this embodiment, the skeletal prosthesis 200 and the bone plate 300 are integrally formed, making the skeletal prosthesis 200 and multiple bone plates 300 structurally continuous. This facilitates the manufacture of the metal 3D printed porous bone-inducing structure tibial prosthesis 100, eliminating the need to install the skeletal prosthesis 200 and bone plates 300, and simplifying the assembly of the metal 3D printed porous bone-inducing structure tibial prosthesis 100.

[0071] Understandably, the porous structure 220 can be a polyhedron, such as a tetrahedron, octahedron, or dodecahedron. Although the tetrahedron porous structure 220 is lighter, it has lower strength.

[0072] In this embodiment, the porous structure 220 is a tetrahedral structure, which gives the porous structure 220 a higher porosity, making it more conducive to the ingrowth of bone tissue and osteocytes and vascularization.

[0073] Understandably, the porous structure 220 has a porosity of 60% to 85%, which has advantages such as promoting tissue growth, balancing mechanical properties, lightweighting, increasing biocompatibility, and promoting fluid transport.

[0074] Understandably, when the porosity of the porous structure 220 is less than 60%, osteoblast migration is easily hindered, and bone ingrowth depth is easily reduced by 60%, which can easily lead to implantation failure of the metal 3D-printed porous bone-inducing structure tibial prosthesis 100. When the porosity of the porous structure 220 is greater than 85%, the mechanical strength of the porous structure 220 drops sharply, making the porous structure 220 unsuitable for load-bearing areas.

[0075] Understandably, the diameters of the two ends of the cavity 230 along the tibia direction are respectively matched with the diameters of the first medullary cavity 410 and the second medullary cavity 510, so that the intramedullary nail 600 can be precisely inserted from the first medullary cavity 410 into the cavity 230 and from the cavity 230 into the second medullary cavity 510 when inserted.

[0076] Working principle: When the tibia becomes infected and part of the lesion needs to be removed, a 3D-printed personalized metal 3D-printed porous bone-inducing structure tibial prosthesis 100 is designed for implantation based on clinical CT or MRI data. First, the contact surfaces of the proximal tibia 400 and the metal 3D-printed porous bone-inducing structure tibial prosthesis 100 and the distal tibia 500 are prepared by osteotomy, so that the tibial cross section is relatively consistent with the metal 3D-printed porous bone-inducing structure tibial prosthesis 100. Then, the metal 3D-printed porous bone-inducing structure tibial prosthesis 100 is implanted between the proximal tibia 400 and the distal tibia 500.

[0077] Then, the intramedullary nail 600 is inserted into the proximal tibia 400 below the knee, passing through the cavity 230 of the bone shaft prosthesis 200, and reaching the designated position on the distal tibia 500. The positioning platform 610 of the intramedullary nail 600 is positioned through the observation window 240 using a positioning instrument. After positioning, multiple transverse locking screws 700 are used to fix the two ends of the intramedullary nail 600 to the proximal tibia 400 and the distal tibia 500 respectively.

[0078] Subsequently, the locking screw 320 is driven into the patient's bone through the locking screw hole 310, and the screw head of the locking screw 320 is screwed into the locking screw hole 310. The surgical incision is then closed, the wound is sutured, and the implantation of the metal 3D printed porous bone-inducing structure tibial prosthesis 100 is completed.

[0079] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A metal 3D-printed porous bone-inducing tibial prosthesis, characterized in that, Including: A skeletal prosthesis, designed according to the anatomical morphology of the patient's lesion site, the skeletal prosthesis includes a solid frame and a porous structure, and the skeletal prosthesis has a cavity inside; Bone plates, at least two of which are respectively connected to both ends of the bone shaft prosthesis along the tibial direction, and at least two of the bone plates are respectively connected to the proximal and distal tibial screws; An intramedullary nail has a first medullary canal at the proximal end of the tibia and a second medullary canal at the distal end of the tibia. The intramedullary nail passes through the first medullary canal, the cavity, and the second medullary canal. The two ends of the intramedullary nail are respectively connected to the proximal and distal tibial screws.

2. The metal 3D printed porous bone-inducing tibial prosthesis according to claim 1, characterized in that, The bone prosthesis is provided with an observation window communicating with the cavity, and the intramedullary nail is provided with a positioning platform, with the observation window and the positioning platform being linearly corresponding.

3. The metal 3D printed porous bone-inducing structure tibial prosthesis according to claim 2, characterized in that, It also includes multiple transverse locking screws, some of which are threaded through the proximal tibia and the intramedullary nail, and others of which are threaded through the distal tibia and the intramedullary nail.

4. The metal 3D printed porous bone-inducing structure tibial prosthesis according to claim 1, characterized in that, The bone plate is provided with locking screw holes and locking screws. The locking screws are inserted into the locking screw holes and then connected to the proximal or distal tibia.

5. The metal 3D printed porous bone-inducing tibial prosthesis according to claim 4, characterized in that, The locking screw includes a first thread located on the screw head portion and a second thread located on the screw shaft portion. The first thread engages with the locking screw hole thread, and the second thread connects to the proximal or distal tibia.

6. The metal 3D printed porous bone-inducing structure tibial prosthesis according to claim 4, characterized in that, The prosthesis has two opposing bone plates connected to its two ends facing the proximal and distal ends of the tibia, and each bone plate has two locking screw holes spaced apart along the tibial direction.

7. The metal 3D printed porous bone-inducing structure tibial prosthesis according to claim 1, characterized in that, The bone prosthesis and the bone plate are integrally formed.

8. The metal 3D printed porous bone-inducing structure tibial prosthesis according to claim 1, characterized in that, The porous structure is a tetrahedral structure.

9. The metal 3D printed porous bone-inducing tibial prosthesis according to claim 8, characterized in that, The porosity of the porous structure is 60% to 85%.

10. The metal 3D printed porous bone-inducing tibial prosthesis according to claim 1, characterized in that, The diameters at both ends of the cavity are adapted to the diameters of the first medullary cavity and the second medullary cavity, respectively.

Images