ZONAL TRABECULAR UNI-COMPARTMENTAL TIBIAL PLATEAU CONTAINING ZIRCONIUM-NIOBIUM ALLOY ON OXIDATION LAYER AND PREPARATION METHOD THEREOF

Abstract

The present invention discloses a zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer and preparation method, including following steps: using zirconium niobium alloy powder as raw material, conducting a 3D printing for one-piece molding to obtain an intermediate product of the uni-compartmental tibial plateau, performing hot isostatic pressing and cryogenic oxidation to obtain the uni-compartmental tibial plateau; the lower surface of the semi-tibial plateau support and the surface of the keel plate are both provided with a bone trabeculae; the zonal trabecular uni-compartmental tibial plateau adopts the structure of arranging step distributed bone trabeculaes which can reduce the fretting wear of the interface between the prosthesis and the bone, and reduce the stress shielding effect of the prosthesis on the bone tissue, homogenize the stress of the tibial plateau bone tissue, and improve the initial stability and long-term stability of the uni-compartmental tibial plateau.

Claims

1. A preparation method of the zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer, including the following steps: 1) using zirconium-niobium alloy powder as a raw material, conducting a 3D printing for one-piece molding, and obtaining a first intermediate product of the zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer, putting the first intermediate product into a Sinter-HIP furnace, heating to 1250° C.-1400° C. under inert gas protection, and placing at a constant pressure of 140 MPa to 180 MPa for 1 h to 3 h, and reducing to a normal pressure, cooling to below 200° C. with the furnace, taking it out, and obtaining a second intermediate product; 2) putting the second intermediate product into a programmed thermostat, cooling to -80° C. to -120° C. at a rate of 1° C./min, keeping it at a constant temperature for 5 h to10 h, and taking it out of the programmed thermostat; and putting it into a liquid nitrogen for 16 h to 36 h, and adjusting the temperature to a room temperature so as to obtain a third intermediate product; 3) putting the third intermediate product in a programmed thermostat, cooling to -80° C. to -120° C. at a rate of 1° C./min, and placing it at a constant temperature for 5 h to10 h, taking it out of the programmed thermostat, and putting it into the liquid nitrogen for 16 h to 36 h, and adjusting the temperature to room temperature so as to obtain a fourth intermediate product; 4) machining, finishing, polishing, cleaning, and drying the fourth intermediate product, and obtaining a fifth intermediate product, where the upper surface roughness of the fifth intermediate semi-tibial plateau support is Ra≤0.050 .Math.m; 5) putting the fifth intermediate product into a tube furnace, introducing the normal-pressure inert gas containing 5% to 15% of oxygen in percentage by mass, heating to 500° C. to 700° C. at 5° C./min to 20° C./min, and cooling to 400° C. to 495° C. at 0.4° C./min to 0.9° C./min, and cooling to be below 200° C. sequentially, take it out to obtain the zonal trabecular uni-compartmental plateau containing zirconium-niobium alloy on oxidation layer. wherein, the inert gas is helium or argon; the zonal trabecular uni-compartmental plateau containing zirconium-niobium alloy on oxidation layer includes a semi-tibial plateau support (1), a side wall (2) is arranged on the upper surface of the straight edge of the semi-tibial plateau support (1), and a semi elliptical keel plate (3) provided with a long round hole is arranged near the side wall of the lower surface of the semi-tibial plateau support, the lower surface of the semi-tibial plateau support (1) and the surface of the keel plate (3) are both provided with a bone trabeculae; a front bone trabeculae (8) and a rear bone trabeculae (9) are arranged on the lower surface of the semi-tibial plateau support (1) except connecting the keel plate (3); a first partition line (6) of the front bone trabeculae (8) and the rear bone trabeculae (9) is perpendicular to the side wall (2) or is formed an angle (4) of 45 °to 70 ° with the side wall (2); the bone trabeculae arranged on the surface of the keel plate (3) comprises an upper bone trabeculae (10) and a lower bone trabeculae (11); the partition line of the upper bone trabeculae and the lower bone trabeculae is a second partition line (12), and the second partition line (12) is located at the lower surface of the top of the long round hole of the keel plate (3) or the upper surface of the bottom of the long round hole of the keel plate (3); the pore size and porosity of the upper bone trabeculae (10) are sequentially smaller than those of the rear bone trabeculae, the front bone trabeculae and the lower bone trabeculae.

2. The preparation method of the zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer according to claim 1, wherein the chemical composition of the zirconium-niobium alloy powder in percentage by mass is respectively 85.6%-96.5% of Zr, 1.0%-12.5% of Nb, and the rest are unavoidable impurities; where a particle size of the zirconium-niobium alloy powder ranges from 45 to 150 .Math.m.

3. The preparation method of the zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer according to claim 1, wherein the specific steps for adjusting the temperature in steps 2) and 3) are: increasing the temperature to -120° C. to -80° C. and keeping the constant temperature for 3 h to 5 h; then increasing the temperature to -40° C. to -20° C. and keeping the constant temperature for 3 h to 5 h; then increasing the temperature to 4° C. to 8° C. and keeping the constant temperature for 1 h to 3 h and then increasing the temperature.

4. The preparation method of the zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer according to claim 1, wherein the first partition line (6) is perpendicular to the side wall (2); an intersection (5) of the first partition line (6) and the side wall (2) divides the side wall (2) into a front section (13) and a rear section (14) of the side wall; and the ratio of the front section (13) and the rear section (14) is (2-3): 1.

5. The preparation method of the zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer according to claim 1, wherein the included angle (4) between the first partition line (6) and the side wall (2) is 45 ° to 70 °; the intersection (5) of the first partition line (6) and side wall (2) is located in the middle of the side wall.

6. The preparation method of the zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer according to claim 1, wherein the pore size of the upper bone trabeculae (10) ranges from 351 .Math.m to 450 .Math.m, the porosity ranges from 60% to 65%; the pore size of the rear bone trabeculae (9) ranges from 451 .Math.m to 550 .Math.m, the porosity ranges from 66% to 70%; the pore size of the front bone trabeculae (8) ranges from 551 .Math.m to 650 .Math.m, the porosity ranges from 70% to 75%; the pore size of the lower bone trabeculae (11) ranges from 651 .Math.m to 750 .Math.m, the porosity ranges from 76% to 80%; the thickness of the upper bone trabeculae (10), the rear bone trabeculae (9), the front bone trabeculae (8) and the lower bone trabeculae (11) are equal to 1 mm to 2 mm.

7. A zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer prepared by the preparation method of the zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer according to claim 1.

8. The zonal trabecular uni-compartmental tibial plateau of claim 7, the chemical composition of the zirconium-niobium alloy powder in percentage by mass is respectively 85.6%-96.5% of Zr, 1.0%-12.5% of Nb, and the rest are unavoidable impurities; where the particle size of the zirconium-niobium alloy powder ranges from 45 to 150 .Math.m.

9. The zonal trabecular uni-compartmental tibial plateau of claim 7, wherein the specific steps for adjusting the temperature in steps 2) and 3) are: increasing the temperature to -120° C. to -80° C. and keeping the constant temperature for 3 h to 5 h; then increasing the temperature to -40° C. to -20° C. and keeping the constant temperature for 3 h to 5 h; then increasing the temperature to 4° C. to 8° C. and keeping the constant temperature for 1 h to 3 h and then increasing the temperature.

10. The zonal trabecular uni-compartmental tibial plateau of claim 7, wherein the first partition line (6) is perpendicular to the side wall (2); an intersection (5) of the first partition line (6) and the side wall (2) divides the side wall (2) into the front section (13) and the rear section (14) of the side wall; and the ratio of the front section (13) and the rear section (14) is (2-3): 1.

11. The zonal trabecular uni-compartmental tibial plateau of claim 7, wherein the included angle (4) between the first partition line (6) and the side wall (2) is 45 ° to 70 °; the intersection (5) of the first partition line (6) and side wall (2) is located in the middle of the side wall.

12. The zonal trabecular uni-compartmental tibial plateau of claim 7, wherein the included angle (4) between the first partition line (6) and the side wall (2) is 45 ° to 70°; the intersection (5) of the first partition line (6) and side wall (2) is located in the middle of the side wall.

13. The zonal trabecular uni-compartmental tibial plateau of claim 7, wherein the pore size of the upper bone trabeculae (10) ranges from 351 .Math.m to 450 .Math.m, the porosity ranges from 60% to 65%; the pore size of the rear bone trabeculae (9) ranges from 451 .Math.m to 550 .Math.m, the porosity ranges from 66% to 70%; the pore size of the front bone trabeculae (8) ranges from 551 .Math.m to 650 .Math.m, the porosity ranges from 70% to 75%; the pore size of the lower bone trabeculae (11) ranges from 651 .Math.m to 750 .Math.m, the porosity ranges from 76% to 80%; the thickness of the upper bone trabeculae (10), the rear bone trabeculae (9), the front bone trabeculae (8) and the lower bone trabeculae (11) are equal to 1 mm to 2 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG. 1 shows a structural diagram of the zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer of the present disclosure.

[0038] FIG. 2 shows an axonometric drawing of the zonal trabecular uni-compartmental tibial plateau of the present disclosure.

[0039] FIG. 3 shows a front view of the zonal trabecular uni-compartmental tibial plateau of the present disclosure, wherein the second partition line 12 passed through the upper surface of the bottom of the long round hole.

[0040] FIG. 4 shows a front view of the zonal trabecular uni-compartmental tibial plateau of the present disclosure, wherein the second partition line 12 passed through the lower surface of the top of the long round hole.

[0041] FIG. 5 is a bottom view of the zonal trabecular uni-compartmental tibial plateau of the present disclosure, wherein the included angle between the first partition line 6 and the side wall is 60°, and the intersection is located in the middle of the side wall.

[0042] FIG. 6 is a bottom view of the zonal trabecular uni-compartmental tibial plateau of the present disclosure, wherein the included angle between the first partition line 6 is perpendicular to the side wall.

[0043] FIG. 7 is the fretting cloud chart showing the interface between the uniform uni-compartmental tibial plateau finite element model and the host bone tissue finite element model of Control Group 1.

[0044] FIG. 8 is the fretting cloud chart showing the interface between the uni-compartmental tibial plateau finite element model and the host bone tissue finite element model of Embodiment 1.

[0045] FIG. 9 is the contact pressure cloud chart showing the uniform trabecular uni-compartmental tibial plateau finite element model of Control Group 1.

[0046] FIG. 10 is the contact pressure cloud chart showing the trabecular uni-compartmental tibial plateau finite element model of Embodiment 1.

[0047] FIG. 11 shows the equivalent stress cloud chart of the uniform trabecular uni-compartmental tibial plateau finite element model of Control Group 1.

[0048] FIG. 12 shows the equivalent stress cloud chart of the trabecular uni-compartmental tibial plateau finite element model of Embodiment 1.

[0049] FIG. 13 shows the equivalent stress cloud chart of the finite element model of tibial plateau bone tissue used for the finite element analysis of Control Group 1.

[0050] FIG. 14 shows the equivalent stress cloud chart of the finite element model of tibial plateau bone tissue used for the finite element analysis of Embodiment 1.

[0051] FIG. 15 shows the metallographic micro structure of the solid part in Control Group 2, wherein A is observed by 50 times magnification; B is observed by 500 times magnification.

[0052] FIG. 16 shows the metallographic microscopic structure of the solid part in Embodiment 1 that has not prepared with step 4) and step 5) in the preparation method, wherein A is observed by 50 times magnification; B is observed by 500 times magnification.

[0053] FIG. 17 shows SEM images of bone trabeculae in Control Group 2.

[0054] FIG. 18 shows SEM images of bone trabeculae in Embodiment 1 that has not been prepared with steps 4) and 5) of the preparation method.

[0055] FIG. 19 shows the SEM of cross-section between the oxidation layer and the matrix in Embodiment 1.

[0056] FIG. 20 shows the XRD curve of the oxidation layer surface in Embodiment 1.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0057] The present disclosure will be further described below with the drawings and embodiments.

Embodiment 1

[0058] The preparation method of the zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer includes the following steps:

[0059] 1) Using zirconium-niobium alloy powder as a raw material, the first intermediate product of the zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer is integrally formed by 3D printing, putting the first intermediate product into a Sinter-HIP furnace, heating to 1250° C. under helium gas protection, and placing at a constant pressure of 180 MPa for 3 h, and reducing to a normal pressure, cooling to below 200° C. with the furnace, taking it out, and obtaining a second intermediate product;

[0060] 2) Putting the second intermediate product into a programmed thermostat, cooling to -80°Cat a rate of 1° C./min, keeping it at a constant temperature for 10 h, and taking it out of the programmed thermostat; and putting it into a liquid nitrogen for 16 h, and adjusting the temperature to a room temperature so as to obtain a third intermediate product;

[0061] 3) Putting the third intermediate product in a programmed thermostat, cooling to -80° C. at a rate of 1° C./min, and placing it at a constant temperature for 10 h, taking it out of the programmed thermostat, and putting it into the liquid nitrogen for 16 h, and adjusting the temperature to room temperature so as to obtain a fourth intermediate product.

[0062] The specific steps for adjusting the temperature in steps 2) and 3) are: increase the temperature to -120° C. and keep the constant temperature for 5 h, then increase the temperature to -40° C. and keep the constant temperature for 5 h, then increase the temperature to 4° C. and keep the constant temperature for 3 h and then increase the temperature.

[0063] 4) The fourth intermediate product is machined, finished, polished, cleaned and dried to obtain a fifth intermediate product. The upper surface roughness of the fifth intermediate semi-tibial plateau support is Ra=0.012 .Math.m.

[0064] 5) Putting the fifth intermediate product into a tube furnace, introducing the normal-pressure helium gas containing 5% of oxygen in percentage by mass, heating to 500° C. at 5° C./min, and cooling to400°Cat 0.4° C./min, and cooling to be below 200° C. sequentially, take it out to obtain the zonal trabecular uni-compartmental plateau containing zirconium-niobium alloy on oxidation layer.

[0065] The structure of the zonal trabecular uni-compartmental plateau containing zirconium-niobium alloy on oxidation layer is the same as its first intermediate product, second intermediate product, third intermediate product, fourth intermediate product, and fifth intermediate product.

[0066] The chemical composition of the zirconium-niobium alloy powder is respectively 85.6% of Zr, 12.5% of Nb by mass percentage, and the rest are unavoidable impurities. The zirconium-niobium alloy powder has a particle size of 45-150 .Math.m and is purchased from Xi’an Sailong Metal Materials Co., Ltd.

[0067] As shown in FIGS. 1-2, the structure of the above-mentioned zonal trabecular uni-compartmental plateau containing zirconium-niobium alloy on oxidation layer includes a semi-tibial plateau support 1, a side wall 2 is arranged on the upper surface of the straight edge of the semi-tibial plateau support 1, and a semi elliptical keel plate 3 provided with a long round hole is arranged near the side wall of the lower surface of the semi-tibial plateau support 1, the lower surface of the semi-tibial plateau support and the surface of the keel plate 3 are both provided with a bone trabeculae; a front bone trabeculae 8 and a rear bone trabeculae 9 are arranged on the lower surface of the semi-tibial plateau support except connecting the keel plate 3; as shown in FIG. 6, a first partition line 6 of the front bone trabeculae 8 and the rear bone trabeculae 9 is perpendicular to the side wall 2. The intersection 5 of the first partition line 6 and the side wall 2 divides the side wall 2 into a front section 13 and a rear section 14 of the side wall; and the ratio of the front section 13 and the rear section 14 is 2: 1, and the ratio can also be 3:1.

[0068] As shown in FIG. 3, the bone trabeculae arranged on the surface of the keel plate 3 comprises an upper bone trabeculae 10 and a lower bone trabeculae 11; the partition line of the upper bone trabeculae and the lower bone trabeculae is a second partition line 12, and the second partition line 12 is located at the lower surface of the top of the long round hole of the keel plate 3.

[0069] The pore size of the upper bone trabeculae 10 is 400 .Math.m, the porosity is 63%.

[0070] The pore size of the rear bone trabeculae 9 is 500 .Math.m, the porosity is 68%.

[0071] The pore size of the front bone trabeculae 8 is 600 .Math.m, the porosity is 73%;

[0072] The pore size of the lower bone trabeculae 11 is 700 .Math.m, the porosity is 78%.

[0073] The thickness of the upper bone trabeculae 10, the rear bone trabeculae 9, the front bone trabeculae 8 and the lower bone trabeculae 11 are equal to 1.5 mm.

Embodiment 2

[0074] The preparation method of the zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer includes the following steps: [0075] 1) Using zirconium-niobium alloy powder as a raw material, the first intermediate product of the zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer is integrally formed by 3D printing, putting the first intermediate product into a Sinter-HIP furnace, heating to 1325° C. under helium gas protection, and placing at a constant pressure of 160 MPa for 2 h, and reducing to a normal pressure, cooling to below 200° C. with the furnace, taking it out, and obtaining a second intermediate product; [0076] 2) Putting the second intermediate product into a programmed thermostat, cooling to -100°Cat a rate of 1° C./min, keeping it at a constant temperature for 7 h, and taking it out of the programmed thermostat; and putting it into a liquid nitrogen for 24 h, and adjusting the temperature to a room temperature so as to obtain a third intermediate product; [0077] 3) Putting the third intermediate product in a programmed thermostat, cooling to -100° C. at a rate of 1° C./min, and placing it at a constant temperature for 7 h, taking it out of the programmed thermostat, and putting it into the liquid nitrogen for 24 h, and adjusting the temperature to room temperature so as to obtain a fourth intermediate product.

[0078] The specific steps for adjusting the temperature in steps 2) and 3) are: increase the temperature to -100° C. and keep the constant temperature for 4 h, then increase the temperature to -30° C. and keep the constant temperature for 4 h, then increase the temperature to 6° C. and keep the constant temperature for 2 h and then increase the temperature.

[0079] 4) The fourth intermediate product is machined, finished, polished, cleaned and dried to obtain a fifth intermediate product. The upper surface roughness of the fifth intermediate semi-tibial plateau support is Ra=0.035 .Math.m.

[0080] 5) Putting the fifth intermediate product into a tube furnace, introducing the normal-pressure helium gas containing 10% of oxygen in percentage by mass, heating to 600° C. at 15° C./min, and cooling to 450°Cat 0.7° C./min, and cooling to be below 200° C. sequentially, take it out to obtain the zonal trabecular uni-compartmental plateau containing zirconium-niobium alloy on oxidation layer.

[0081] The structure of the zonal trabecular uni-compartmental plateau containing zirconium-niobium alloy on oxidation layer is the same as its first intermediate product, second intermediate product, third intermediate product, fourth intermediate product, and fifth intermediate product.

[0082] The structure of the above-mentioned zonal trabecular uni-compartmental plateau containing zirconium-niobium alloy on oxidation layer includes a semi-tibial plateau support 1, a side wall 2 is arranged on the upper surface of the straight edge of the semi-tibial plateau support 1, and a semi elliptical keel plate 3 provided with a long round hole is arranged near the side wall of the lower surface of the semi-tibial plateau support 1, the lower surface of the semi-tibial plateau support and the surface of the keel plate 3 are both provided with a bone trabeculae; a front bone trabeculae 8 and a rear bone trabeculae 9 are arranged on the lower surface of the semi-tibial plateau support except connecting the keel plate 3; as shown in FIG. 5, a first partition line 6 of the front bone trabeculae 8 and the rear bone trabeculae 9 is formed an angle 4 of 45 °with the side wall 2; and the intersection 5 of the first partition line 6 and the side wall 2 is in the middle of the side wall.

[0083] As shown in FIG. 4, the bone trabeculae arranged on the surface of the keel plate 3 comprises an upper bone trabeculae 10 and a lower bone trabeculae 11; the partition line of the upper bone trabeculae and the lower bone trabeculae is a second partition line 12, and the second partition line 12 is located at the upper surface of the bottom of the long round hole of the keel plate 3.

[0084] The chemical composition of the zirconium-niobium alloy powder is respectively 93.4% of Zr, 5.1% of Nb by mass percentage, and the rest are unavoidable impurities. The zirconium-niobium alloy powder has a particle size of 45-150 .Math.m and is purchased from Xi’an Sailong Metal Materials Co., Ltd.

[0085] The pore size of the upper bone trabeculae 10 is 351 .Math.m, the porosity is 60%.

[0086] The pore size of the rear bone trabeculae 9 is 451 .Math.m, the porosity is 66%.

[0087] The pore size of the front bone trabeculae 8 is 551 .Math.m, the porosity is 70%;

[0088] The pore size of the lower bone trabeculae 11 is 651 .Math.m, the porosity is 76%.

[0089] The thickness of the upper bone trabeculae 10, the rear bone trabeculae 9, the front bone trabeculae 8 and the lower bone trabeculae 11 are equal to 1 mm.

Embodiment 3

[0090] The preparation method of the zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer includes the following steps: [0091] 1) Using zirconium-niobium alloy powder as a raw material, the first intermediate product of the zonal trabecular uni-compartmental tibial plateau containing zirconium-niobium alloy on oxidation layer is integrally formed by 3D printing, putting the first intermediate product into a Sinter-HIP furnace, heating to 1400° C. under argon gas protection, and placing at a constant pressure of 140 MPa for 1 h, and reducing to a normal pressure, cooling to below 200° C. with the furnace, taking it out, and obtaining a second intermediate product; [0092] 2) Putting the second intermediate product into a programmed thermostat, cooling to -120°Cat a rate of 1° C./min, keeping it at a constant temperature for 5 h, and taking it out of the programmed thermostat; and putting it into a liquid nitrogen for 36 h, and adjusting the temperature to a room temperature so as to obtain a third intermediate product; [0093] 3) Putting the third intermediate product in a programmed thermostat, cooling to -120° C. at a rate of 1° C./min, and placing it at a constant temperature for 5 h, taking it out of the programmed thermostat, and putting it into the liquid nitrogen for 36 h, and adjusting the temperature to room temperature so as to obtain a fourth intermediate product.

[0094] The specific steps for adjusting the temperature in steps 2) and 3) are: increase the temperature to -80° C. and keep the constant temperature for 3 h, then increase the temperature to -20° C. and keep the constant temperature for 3 h, then increase the temperature to 8° C. and keep the constant temperature for 1 h and then increase the temperature.

[0095] 4) The fourth intermediate product is machined, finished, polished, cleaned and dried to obtain a fifth intermediate product. The upper surface roughness of the fifth intermediate semi-tibial plateau support is Ra=0.050 .Math.m.

[0096] 5) Putting the fifth intermediate product into a tube furnace, introducing the normal-pressure argon gas containing 15% of oxygen in percentage by mass, heating to 700° C. at 20° C./min, and cooling to 495°Cat 0.9° C./min, and cooling to be below 200° C. sequentially, take it out to obtain the zonal trabecular uni-compartmental plateau containing zirconium-niobium alloy on oxidation layer.

[0097] The structure of the above-mentioned zonal trabecular uni-compartmental plateau containing zirconium-niobium alloy on oxidation layer includes a semi-tibial plateau support 1, a side wall 2 is arranged on the upper surface of the straight edge of the semi-tibial plateau support 1, and a semi elliptical keel plate 3 provided with a long round hole is arranged near the side wall of the lower surface of the semi-tibial plateau support 1, the lower surface of the semi-tibial plateau support and the surface of the keel plate 3 are both provided with a bone trabeculae; a front bone trabeculae 8 and a rear bone trabeculae 9 are arranged on the lower surface of the semi-tibial plateau support except connecting the keel plate 3; a first partition line 6 of the front bone trabeculae 8 and the rear bone trabeculae 9 is formed an angle 4 of 70° with the side wall 2; and the intersection 5 of the first partition line 6 and the side wall 2 is in the middle of the side wall.

[0098] As shown in FIG. 3, the bone trabeculae arranged on the surface of the keel plate 3 comprises an upper bone trabeculae 10 and a lower bone trabeculae 11; the partition line of the upper bone trabeculae and the lower bone trabeculae is a second partition line 12, and the second partition line 12 is located at the lower surface of the top of the long round hole of the keel plate 3.

[0099] The chemical composition of the zirconium-niobium alloy powder is respectively 96.5% of Zr, 1% of Nb by mass percentage, and the rest are unavoidable impurities. The zirconium-niobium alloy powder has a particle size of 45-150 .Math.m and is purchased from Xi’an Sailong Metal Materials Co., Ltd.

[0100] The pore size of the upper bone trabeculae 10 is 450 .Math.m, the porosity is 65%.

[0101] The pore size of the rear bone trabeculae 9 is 550 .Math.m, the porosity is 70%.

[0102] The pore size of the front bone trabeculae 8 is 650 .Math.m, the porosity is 75%;

[0103] The pore size of the lower bone trabeculae 11 is 750 .Math.m, the porosity is 80%.

[0104] The thickness of the upper bone trabeculae 10, the rear bone trabeculae 9, the front bone trabeculae 8 and the lower bone trabeculae 11 are equal to 2 mm.

Control Group 1

[0105] The structure of an uniform trabecular uni-compartmental tibial plateau is similar to that of the Embodiment 1, the different structure between the uniform trabecular uni-compartmental tibial plateau and the Embodiment 1 are as follows:

[0106] The thickness of the upper bone trabeculae 10, the lower bone trabeculae 11, the front bone trabeculae 8 and the rear bone trabeculae 9 are a same kind of the bone trabeculae with a pore size of 500 .Math.m, a porosity of 68%, and a trabecular thickness of 1.5 mm.

Control Group 2

[0107] Using zirconium-niobium alloy powder as Embodiment 1 as a raw material, conducting a 3D printing for one-piece molding, and obtaining zonal trabecular uni-compartmental tibial plateau which structure is same as that of the Embodiment 1.

Experiment Verification

[0108] The reliable biological fixation of prosthesis bone interface mainly depends on the initial stability of prosthesis fixation. Excessive relative movement between prosthesis and bone interface will inhibit the process of bone integration. Studies have shown that when the fretting at the interface of prosthesis and bone exceeds 50 to 150 .Math.m, a large amount of fibrous tissue will be formed at the bone interface, which will reduce the fixation strength of the prosthesis and eventually lead to prosthesis loosening. The finite element model of Control Group 1 and Embodiment 1 and the simplified cancellous bone partitioning model of the tibial plateau were analyzed by finite element analysis to obtain the fretting cloud map, as shown in FIGS. 7-8, compared with the uniform trabecular tibial plateau of Control Group 1, the maximum fretting value at the interface between the zonal trabecular uni-compartmental tibial plateau finite element model and the tibial plateau bone tissue finite element model in Embodiment 1 is 4.50 .Math.m, decreased by 43%, suggesting that the present disclosure can obtain small fretting and has excellent initial stability.

[0109] The finite element model of Control Group 1 and Embodiment 1 and the simplified cancellous bone partitioning model of the tibial plateau were analyzed by finite element analysis to obtain the contact pressure cloud chart (as shown in FIGS. 9-10) and equivalent stress cloud chart (as shown in FIGS. 11-14). Compared with the uniform trabecular tibial plateau of Control Group 1, the finite element model of the uni-compartmental tibial plateau in Embodiment 1 has more uniform contact pressure, suggesting that the bone growth performance is uniform. The maximum equivalent stress of the of the finite element model of the uni-compartmental tibial plateau in Embodiment 1 is 2.5 MPa, which is reduced by about 40%; and the maximum equivalent stress of the corresponding tibial plateau bone tissue finite element model is 1.28Mpa, which is increased by about 4%, suggesting that the uni-compartmental tibial plateau prepared by the present disclosure reduce the stress shielding effect and have excellent bone ingrowth. The result showed that the uni-compartmental tibial plateau prepared by the present disclosure have excellent and uniform bone ingrowth performance, which can avoid prosthesis loosening caused by osteoporosis after long-term prosthesis implantation, and can obtain long-term stability.

[0110] The results of the finite element analysis show that the fretting cloud chart, contact pressure cloud chart and equivalent stress cloud chart of Embodiments 2 and 3 are similar to those of Embodiment 1.

[0111] A solid part in the control group 2 and a solid part of the embodiment 1 that has not been prepared with step 4) and 5) were observed and analyzed by an inverted scanning electron microscope (Axio Vert.A1, Zeiss, Germany). The results were shown in FIGS. 15-16. In the metallographic photos of the Control Group 2, small α martensite can be observed. The structure is small, easy for stress concentration, and the plasticity is poor. In the metallograph of Embodiment 1, α phase can be observed, basket net structure, grain refinement. The results indicated that the matrix (without oxidation layer) of the uni-compartmental tibial plateau prepared by the present disclosure has excellent strength and plasticity.

[0112] As shown in FIGS. 17-18, the trabecular part of the control group 2 and the trabecular part of the embodiment 1 that has not been prepared with step 4) and 5) were observed and analyzed by scanning electron microscopy (Crossbeam340/550, Zeiss, Germany). Compared with the control group 2, the zirconium-niobium alloy powder of the trabecular part of the embodiment 1 was further sintered, suggesting that the overall performance of the bone trabeculae was improved.

[0113] A physical compression test piece (size: 8*8*10 mm.sup.3) that has not been prepared with step 4) and 5) in the preparation method in the embodiment 1 and a physical compression test piece (size: 8*8*10 mm.sup.3) in the control group 2 were subjected to a compression performance test by an electronic universal testing machine (UTM5105, Shenzhen SUNS Technology Co., Ltd., and China). There were 5 physical compression test pieces respectively in the embodiment 1 and the control group 2. Results were shown in Table 1. The compressive yield strength of embodiment 1 is 546.72 MPa, better than that of Control Group 2 (P<0.05), suggesting that the solid part prepared by the present disclosure has excellent anti-compression performance.

TABLE-US-00001 Anti-compression experiment results of the solid specimens of Control Group 2 and Embodiment 1 (x± s, n=5, *P<0.05, compared with Control Group 2) Group Cross-sectional Area (mm.sup.2) Yield Load (kN) Yield Strength (MPa) Embodiment 1 64 34.99±4.04* 546.72±63.19* Control Group 2 64 23.59±2.30 368.63±35.92

[0114] A bone trabeculae compression specimens with pore size of 600 .Math.m and porosity of 73% of the Control Group 2 and the bone trabeculae compression specimens with pore size of 600 .Math.m and porosity of 73% of Embodiment 1 (specimen size: 8*8*10 mm.sup.3) that has not been prepared with step 4) and step 5) of the above-mentioned preparation method, were subjected to a compression test by the electronic universal testing machine (UTM5105, Shenzhen SUNS Technology Co., Ltd., and China). Bone trabeculae compression specimens of the Control Group 2 and the Embodiment 1 were 5 pieces each. The results are shown in Table 2. The compressive yield strength of Embodiment 1 is 17.92 MPa, significantly better than that of Control Group 2 (P<0.05), suggesting that the bone trabecular part of the tibial plateau prepared by the present disclosure has excellent anti-compression performance.

TABLE-US-00002 Anti-compression experiment results of the bone trabecular specimens of Control Group 2 and Embodiment 1 (x± s, n=5, *P<0.05, compared with Control Group 2) Group Cross-sectional Area (mm.sup.2) Yield Load (N) Yield Strength (MPa) Embodiment 1 64 1147.03±87.15* 17.92±1.36* Control Group 2 64 894.86±98.12 13.98±1.53

[0115] The cross-section of the matrix and oxidation layer of the zirconium-niobium alloy of Embodiment 1 was observed by scanning electron microscopy (Crossbeam340/550, Zeiss, Germany) (see FIG. 19). The cross sections of the matrix and oxidation layer of the zirconium-niobium alloy in Embodiments 2 and 3 were observed. The oxidation layer thickness were 10.3 .Math.m, 17.2 .Math.m and 20.6 .Math.m, respectively. There was an oxygen-rich layer between the oxidation layer and the matrix of the zirconium-niobium alloy to enhance the bonding force between the matrix and oxidation layer of zirconium-niobium alloy.

[0116] XRD (D8DISCOVER, Bruker, Germany) analyzed the oxidation layer of the zonal trabecular uni-compartmental tibial plateau of Embodiment 1 (as shown in FIG. 20). The oxidation layer contained monoclinic phase zirconia and tetragonal phase zirconia.

[0117] The microhardness measurement on the zonal trabecular uni-compartmental tibial plateau of Embodiments 1-3 was determined by a microhardness tester (MHVS-1000 PLUS, Shanghai Aolongxingdi Testing Equipment Co., Ltd., China), in which the load was 0.05 kg, the load time of the specimens was 20 s, and 8 points were taken for each specimen. The average hardness values measured in Embodiments 1-3 were 1948.6Hv, 1923.7Hv, and 1967.2Hv, suggesting that the oxidation layer in the zonal trabecular uni-compartmental tibial plateau of the present disclosure has high hardness.

[0118] Experiments have proved that the zirconium-niobium alloy powder bonding degree, compressive properties, solid part of the compressive properties, metallographic structure, the crystal structure, thickness and hardness of the oxidation layer for the zonal trabecular uni-compartmental tibial plateau prepared in Embodiments 2 and 3, are similar to that prepared in Embodiment 1.