Femoral extramedullary positioning osteotomy device in knee joint replacement and use method thereof

Abstract

The invention belongs to the technical field of medical instruments, particularly relates to a femoral extramedullary positioning osteotomy device in knee joint replacement and a use method thereof, and provides the following scheme that the femoral extramedullary positioning osteotomy device comprises a sliding rod, an osteotomy femur and a second femur osteotomy guide plate, wherein the outer wall of the first fixing nail is fixedly connected with an original femoral bone, a sliding block is arranged on the outer wall of the sliding rod, and a braking assembly used for braking the sliding rod is arranged in the sliding block. The osteotomy device is simple in structure and convenient to operate, and the front-back position and the deflection angle of the bone cutting module are obtained by rotating the worm and kicking and moving the sliding block; then the rotating rod is rotated to drive the first thighbone osteotomy guide plate to move, the thickness of the bone needing to be cut is determined, then the rotating shaft drives the gear ring and the rotating disc to rotate, the levelness of the two positioning holes is guaranteed through the circular dial, the vertical line and the falling block, and deviation formed in later osteotomy is prevented.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a femoral extramedullary positioning osteotome and a method of use thereof in knee joint replacement. Background technique [0002] Total knee arthroplasty is a widely used and highly effective treatment for patients with advanced knee disease. Alignment technique is the basis of knee arthroplasty, which refers to the method of osteotomy and prosthesis installation according to the alignment during arthroplasty. The current traditional alignment method is mechanical axis alignment, that is, osteotomy and prosthesis installation are performed according to the mechanical axis of the lower limb formed by the center of the femoral head-knee joint center-ankle joint center. The rotation axis is perpendicular to the mechanical axis. For femoral osteotomy, the current practice is to find the anatomical axis of the femur by inserting the medullary canal rod through the medullary...

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Problems solved by technology

[0003] However, since the human knee joint is naturally varus, according to the dynamic alignment theory, the femur should also be kept in varus position for osteotomy, and the degree of wear and tear of the patient’s femur needs to be amputated with different thicknesses of the distal femur (because most patients The distal femur is worn), and it is necessary to ensure that the osteotomy plane is parallel to the joint line before the wear occurs, so that there will be no misalignment between the osteotomy plane and the joint line, which is difficult to achieve with the current technology and tools, and most people use a patch The method of compensating for the distal femoral defect was tried, but the solution was not accurate enough and had certain deviations, and it required a high level of experience and technical level of the operator, which could not meet the needs of most patients.

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