A kind of knee joint prosthesis with locking mechanism

Abstract

The invention discloses a knee joint prosthesis with a locking mechanism, which comprises a tibial plateau support, a tibial spacer is arranged on the upper end of the tibial plateau support, a dovetail groove is arranged on one side of the upper end of the tibial plateau support, and the tibial plateau support The position corresponding to the dovetail plate and the dovetail groove is provided with a dovetail protrusion, the end of the tibial plateau is opposite to the dovetail groove is provided with a square protrusion, and the position corresponding to the square protrusion on the tibial spacer is provided with a square concave Groove, the square protrusion is provided with a rectangular hole, the position corresponding to the rectangular hole is provided with an oblong hole in the square groove, and an inner insert is provided in the rectangular hole and the oblong hole; The invention discloses a knee joint prosthesis with a locking mechanism, which greatly enhances the connection strength between the tibial plateau support and the tibial spacer, reduces the micromotion between the tibial plateau support and the tibial spacer, and reduces the tibial spacer. The production of flake debris can reduce the occurrence of osteolysis in patients.

Description

technical field [0001] The invention relates to the field of knee joint prosthesis replacement, in particular to a knee joint prosthesis with a locking mechanism. Background technique [0002] At present, in international and domestic knee prosthesis replacement operations, the vast majority use total knee replacement surgery, that is, the femoral end is installed on the femoral prosthesis, and the tibial end is installed on the tibial prosthesis. The most widely used tibial prosthesis in the prior art The prosthesis is a combination of tibial plate support and tibial spacer. During the operation, after the tibial plateau tray is implanted during the operation, the tibial spacer is pushed into the dovetail groove of the tibial plateau tray, and then the spacer is driven into the tibial tray with a driving tool. Although this method has been widely used, there are still some problems. 1. There is a risk of damage to the tibial spacer during the operation. Because the tibial...

AI Technical Summary

Problems solved by technology

1. There is a risk of damage to the tibial spacer during the operation. Because the tibial plateau support and the tibial spacer are driven in, if the doctor does not push the spacer in place during the operation with inaccurate force, the lock hook of the spacer will be damaged, resulting in the failure of the spacer. The shim cannot be used and has to be replaced with a new shim, which will prolong the operation time and cause pain to the patient; 2. The elasticity of the tibial shim is reduced after the operation, resulting in a reduction in the service life. The material of the tibial shim is high-molecular polyethylene, which has With a certain degree of elasticity, after a certain number of years of use of the screw-in structure, the long-term use of the lock hook of the tibial spacer will cause a decrease in elasticity and strength, and sometimes there will be medical accidents in which the tibial spacer comes out of the tibial plateau support. The patient caused more serious injuries and needed to undergo knee replacement again; 3. After the operation, the tibial spacer was easy to disengage under the limit state, and the drive-in structure itself had certain structural defects. After the joint operation was completed, when the patient bent the knee , the tibial spacer and the tibial plateau bear greater tension, especially when the knee is flexed to the extreme, for example, when the knee flexion reaches 135°, the tension between the tibial spacer and the tibial plateau is the largest, while the tibial spacer and the Only through the locking hook between the tibial plateau support can not bear such a large tension force, it will cause the tibial spacer and the tibial plateau support to disengage, and the knee joint prosthesis needs to be replaced; Fretting occurs, and the friction between the two causes wear debris on the tibial spacer, causing osteolysis

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