Stable fixing bone plate for high tibia osteotomy

Abstract

The invention discloses a stable type fixing bone plate for high tibia osteotomy (HTO), which comprises a longitudinal plate part and a transverse plate part transversely arranged from the top end of the longitudinal plate part, a plurality of fixing holes are formed in the longitudinal plate part and the transverse plate part in a penetrating manner, a protruding column extends from the rear side of at least one fixing hole of the transverse plate part, and the protruding column is used for fixing the longitudinal plate part and the transverse plate part. And the fixing hole penetrates through the protruding column. When the fixing bone plate is applied, the protruding column is inserted into the head of the tibia of a patient after osteotomy, the screw can penetrate through the protruding column and then is locked into the tibia, the rear section of the screw is screwed and locked in the fixing hole of the transverse plate part, and shearing force generated between the tibia of the patient and the fixing bone plate cannot directly act on the screw. Therefore, the screw is prevented from being broken due to shearing force.

Description

technical field [0001] The invention relates to a stable fixed bone plate for high tibial osteotomy. Background technique [0002] At present, for patients with knee joint pain, artificial knee joint replacement surgery is usually performed. In this artificial knee joint replacement surgery, the top segment of the tibia and the bottom segment of the femur are resected, and then the artificial knee joint is installed between the femur and the tibia. , and complete the entire replacement operation, but the above-mentioned method, the patient must bear a large risk of bone loss, wound and infection, and requires a very long recovery and rehabilitation time after the operation. [0003] For knee pain lesions, most patients are caused by wear of the medial knee joint surface. High tibial osteotomy is to create an osteotomy tangent above the medial tibia of the patient, and spread the tibia to a predetermined angle from the tangent. A bone plate is used to fix the tibial bone fra...

AI Technical Summary

Problems solved by technology

[0005] Due to the high tibial osteotomy, it is necessary to fix the stretched tibia, so when the tibia is not fully fused, the weight of the patient's body will be fully borne by the bone plate. ,like figure 1 , 2 As shown, it is locked between the two upper and lower tibias 21 and 22 after the patient's tibia has been cut, so the downward gravity W on the cut upper tibia 21 is not borne by the bone plate P, but by the screw S bears directly, and the reaction force generated by the truncated lower tibia 22 will be acted on the bone plate P by the screw S', so the shear force will be generated between the bone plate P and the upper tibia 21. When the patient performs more intense exercise, It is easy to generate stress concentration at the thread of the screw S, causing the screw S to break, such as figure 2 As shown in the mark B, if the screw S is broken, the bone plate P will no longer be able to stably fix the cut tibia, and the high tibial osteotomy will fail

[0006] In addition, the existing bone plate used in high tibial osteotomy is used to fix the bone plate and the tibial screw, such as figure 2 As shown, the screw S usually uses a self-tapping screw to directly drill through the tibia 21, because the screw teeth of the screw S are directly twisted into the compact bone regions 210, 220 of the upper and lower tibia 21, 22, and because the screw teeth are V-shaped Screw teeth will form V-shaped grooves 211, 221 on the compact bone regions 210, 220 of the tibia. When the upper and lower tibias 21, 22 are stressed, it is very easy to generate stress on the V-shaped grooves 211, 221. Concentration, causing the upper and lower tibia 21, 22 to crack

[0007] Therefore, it is the key to the success of this operation to ensure that the screws used to fix the bone plate in the high tibial osteotomy will not break during the recovery stage of the patient, or will not cause the tibia to crack. plate, and cannot effectively increase the bearing strength of the screw. Due to the limited outer diameter of the human tibia, it is also impossible to increase the screw strength by increasing the screw diameter. Stabilized Fixed Plates for Tibial Osteotomy

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