Screw applied to thighbone posterior condyle fractures

Abstract

The invention discloses a screw applied to thighbone posterior condyle fractures. The screw applied to the thighbone posterior condyle fractures comprises a component (A) and a component (B), wherein the component (A) is of a non-hollow structure and provided with a thread (1) and a thread (2), the interior of the component (B) is hollow, a thread (5) is arranged at the front end of the component (B), the thread (5) and the thread (2) are coaxial threads, and the thread (5) is matched with the thread (2) of the component (A). The screw applied to the thighbone posterior condyle fractures is characterized in that, the tail of the thread (2) is a triangle prism, and the length of the component (B) is 1 / 4 to 1 / 2 of the length of the component (A). According to the bone mineral density of a patient, pressure needed by internal joint fracture fragment compression is quantized, torque force needed by the screw when the screw is screwed into a device is quantized, and furthermore the crew applied to the thighbone posterior condyle fractures benefits formation of a standard and popularization of technology.

Description

technical field [0001] The invention relates to a fracture fixation device for medical use. Background technique [0002] In the treatment of fractures of the posterior femoral condyle that require surgery, lag screws are required to achieve reduction, compression and strong fixation between the fracture fragments. The biomechanical principle of this treatment method and the internal fixation used is as follows: the lag screw relies on the axial compressive stress between the gasket and the cortical bone to form a compression effect between the fracture fragments, and realize the reduction, compression and Strong fixation; however, at present, when the lag screw achieves reduction and pressure between the fracture fragments and is firmly fixed, the torque required to screw in the lag screw cannot be quantified, and the pressure between the fracture fragments cannot be quantified, and there is a problem of initial fixation failure. [0003] Initial fixation failure refers to...

AI Technical Summary

Problems solved by technology

The biomechanical principle of this treatment method and the internal fixation used is as follows: the lag screw relies on the axial compressive stress between the gasket and the cortical bone to form a compression effect between the fracture fragments, and realize the reduction, compression and Strong fixation; however, at present, when the lag screw achieves reduction and pressure between the fracture fragments and is firmly fixed, the torque required to screw in the lag screw cannot be quantified, and the pressure between the fracture fragments cannot be quantified, and there is a problem of initial fixation failure

[0003] Initial fixation failure refers to: the torque required for the lag screw screwed into the fracture fragment depends on the experience of the operator, and is usually overtightened, resulting in plastic deformation of the screw, fracture or damage to the interface between the bone and the screw thread, resulting in failure of the internal fixation

The torque required to screw the lag screw into the fracture depends on the experience of the operator, and the accumulation of experience depends on the experience of failure. There is a slope of the learning curve, which is not conducive to the formation of quantitative standards for this technique.

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