Knee-joint internal and external rotating angle measurer

Abstract

The invention discloses a knee-joint internal and external rotating angle measurer used in the knee-joint surface replacement technology for a surgery. According to the knee-joint surface replacement technology, due to the moderate outward rotation of a prosthesis on the thighbone side, a buckling clearance and a straightening clearance can be well matched, and the complication caused by poor motion track of the patella is reduced. The knee-joint internal and external rotating angle measurer is composed of a rear condyle positioning frame and an angle ruler. A rotating shaft of the angle ruler is located in a longitudinal groove in the rear condyle positioning frame, and the angle ruler can horizontally move up and down and can rotate around the shaft, so that the angles of different skeletons are measured. According to the knee-joint internal and external rotating angle measurer, on the basis of the actual requirement in the knee-joint replacement technology, the knee-joint internal and external rotating angle measurer is developed, the knee-joint internal and external rotating angle measurer is simple in structure, accurate in measurement, convenient to use and universal during the surgery, measurement of the knee-joint internal and external rotation angles during the surgery is achieved, and supports are provided for accurate implementation of the surgery.

Description

technical field [0001] The invention relates to an angle measuring device used in surgical knee joint surface replacement, in particular to a knee joint internal and external rotation angle measuring device. Background technique [0002] In knee arthroplasty, the application of femoral condyle external rotation angle in total knee arthroplasty has attracted the attention of domestic and foreign scholars. During the operation, moderate external rotation of the femoral prosthesis can make the flexion gap and extension gap of the joint well matched, and reduce the complications caused by poor patella trajectory, including prosthesis loosening, patella-femur impact, and patella lateral displacement. Loose or even dislocation, patellar tendon rupture, etc. There are many reference lines and inspection methods for measuring the rotation angle of the distal femur. The most commonly used reference lines include the posterior femoral condyle line (PCL), the epicondyle line (SEA), th...

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Problems solved by technology

[0003] According to clinical statistics, there are considerable differences in the posterior femoral condyle angle (PCA) among individuals: first of all, there are racial differences. The Hong Kong author reported that the external rotation angle of the femur in southern China is significantly greater than that of foreign data; there are also differences between men and women. Therefore, It is very important to measure the internal and external rotation angle of the knee joint, but currently there is no special tool for intraoperative measurement

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