Large-wing-type knee joint pulley groove prosthesis

Abstract

The invention discloses a large-wing-type knee joint pulley groove prosthesis. The large-wing-type knee joint pulley groove prosthesis comprises a pulley curved surface, a bone cement groove and a middle column, wherein the pulley curved surface and the bone cement groove integrally form the pulley groove prosthesis, and the middle column is integrally arranged at the bottom of the pulley groove prosthesis; and the bone cement groove comprises a bone cement fence, bone cement fixing blocks and a bone cement pool, the bone cement fence is arranged at the edge of the pulley groove prosthesis, the bone cement pool is arranged on the pulley groove prosthesis on the inner side of the bone cement fence, and the bone cement fixing blocks are arranged on the bone cement pool on the inner side of the bone cement fence. The large-wing-type knee joint pulley groove prosthesis has the advantages that bone cement is adopted for fixation, fixation is firm, micro-motion is allowed, and the service life is longer; ceramic or cobalt-chromium-molybdenum alloy materials are adopted, the strength is high, the hardness is high, deformation is not prone to occurring, the scratch resistance is good, the surface smoothness is high, and friction and abrasion are extremely small; and the operation difficulty is lower, the number of operation tools is smaller, the operation time is shorter, no fracture risk exists in the operation, the bone integrity is good, the looseness rate is low, and the service life is remarkably prolonged.

Description

technical field [0001] The invention relates to the technical field of prostheses, in particular to a large-wing type knee joint pulley groove prosthesis. Background technique [0002] Pets have been good partners of human beings since ancient times, and even become part of the family and relatives in our lives. But pets can get sick, especially dogs, and can suffer from severe joint disease just like people. At present, patellar joint disease is very common clinically all over the world. The high-incidence breeds include small dogs such as Poodles, Pomeranians, Chihuahuas, and Yorkshires, as well as medium and large dogs such as Huskies, Alaska, Golden Retrievers, Labradors, and German Shepherds. [0003] An effective means of treating patellar joint disease-patella trochlear replacement (PGR), which was first started in 2009, indications include: chronic or severe patellar dislocation, severe articular cartilage loss, severe degenerative osteoarthropathy , Severe trochle...

AI Technical Summary

Problems solved by technology

Although this kind of prosthesis has been widely used and has a good effect, there are many problems

[0005] Problem 1: The use of cortical nails to fix the base plate will damage the surrounding bone and even cause fractures

At the same time, the strong locking of the screw type cannot allow the micro-movement of the prosthesis at all, which will lead to loosening of the prosthesis in the long run;

[0006] Problem 2: The fastening method between the base plate and the prosthesis will generate metal wear debris under the action of complex loads (pressure, tension, overturning moment, rotational moment, etc.), and the porous fastening method is an obvious over-constraint problem, which must be Strictly control the assembly error. If the dimensional tolerances and shape tolerances between multiple holes cannot be perfectly matched, the prosthesis will not be parallel to the back plate in the short term, or warping or twisting will occur, and the force between the columns and the holes will be uneven. , long-term lead to column fracture or hole tearing, so that the prosthesis is separated from the back plate, and a second operation is necessary

[0007] Problem 3: The existing prosthesis uses titanium alloy as raw material, which has low strength and low hardness. It has many problems such as easy deformation, poor scratch resistance, not smooth surface, and serious friction and wear. When coating, due to the thermal expansion coefficient gradient between the coating and the base material, it is easy to produce surface chipping when the cold and heat alternate, thus damaging the patella and causing pain to the pet

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