METHOD OF SETTING ROTATION OF THE FEMORAL COMPONENT AND FLEXION GAP IN PRIMARY AND REVISION KNEE ARTHROPLASTY Russian patent published in 2023 - IPC A61B17/56 

FIELD: medicine; traumatology and orthopedics.

SUBSTANCE: invention can be used to set the rotation of the femoral component and flexion gap in primary and revision knee arthroplasty. Computed tomograms of the knee joints are performed from the operated and contralateral sides. The level of the flexion gap is measured in relation to the epicondyles of the femur from the healthy side by drawing on the tomogram perpendicular lines from the epicondyles to the line passing through the posterior points of the outer and inner condyles of the femur. From the largest perpendicular, the thickness of the posterior sections of the femoral component of the endoprosthesis is subtracted, and a difference that reflects the level of resection of the posterior sections of the femoral condyles is obtained. Distal resection of the condyles of the femur is performed. On the obtained sawdust of the femur, a device for setting the rotation of the femoral component and the flexion gap is placed, the body of which has a rectangular shape and is equipped with two retractable pins, which are fixed with four screw clamps on the epicondyles of the femur. Also, the rectangular body of the device has two holes for fixing it with pins to the femur, a T-shaped bar is installed in the guide element of the device body with the possibility of its vertical movement. One of the parts of the bar has a through slot for an oscillating saw, and on its other part a millimeter scale is made to display the distance from the supracondylar line to the level of resection of the posterior sections of the femoral condyles. A through slot made in a T-shaped bar for an oscillatory saw is placed on the level calculated from a computed tomogram from a healthy contralateral side so that the direction of the slot is parallel to the line passing through the epicondyles of the femur. Resection of the posterior femoral condyles is performed.

EFFECT: method provides increased efficiency of primary and revision knee arthroplasty due to precise rotation of the femoral component and knee flexion gap.

1 cl, 5 dwg, 1 ex