METHOD FOR PRE-OPERATIONAL PLANNING OF SCREW FIXATION OF ACETABULAR COMPONENT WITH FOLLOWING HIP REPLACEMENT Russian patent published in 2018 - IPC A61B5/00 A61B17/56 A61F2/32 

FIELD: medicine.

SUBSTANCE: invention refers to medicine, namely to traumatology and orthopaedics, and can be used in planning and performing operations of primary and revision hip replacement using three-dimensional models of pelvic bones and the acetabular component. Form three-dimensional models of the pelvic bones of the patient and the serial acetabular component with the planning of their optimal mutual positioning. On the edge of the acetabular component model, a landmark is marked, and holes for fixing screws are positioned on its hemisphere. Through the centers of these apertures, axes are formed on which cones are formed, corresponding to the permissible deviations of the conducted screws, with the vertices located at the points of intersection of the axes with the outer edge of the hemisphere. Then combine the obtained model of the acetabular component with the pelvic model and specify the necessary location of the rotation center of the endoprosthesis head and the angles of the frontal incision and anteversion. Perform the removal of bone tissue in the volume necessary for the installation of the acetabular component of the endoprosthesis. Then rotate the model of the acetabular component around the axis of the hemisphere and, without changing the angles of the frontal inclination and the anteversion of the component, select the necessary number of screws, their length, directions and holes for their conduct, on the model of the pelvic bones mark the edges of the acetabular component with a reference point. Form the tunnels corresponding to the direction of the insertion of the screws, after which the method of three-dimensional printing from the sterilized material reproduces a fragment of the obtained model of the pelvic bones, which is used during the operation to achieve the planned position of the acetabular component and to conduct the screws according to previously determined parameters.

EFFECT: method makes it possible to optimize the positioning of the acetabular component relative to the pelvic bones in the maximum area of contact of the threaded surface of the screws with the bone tissue, and also reduce the likelihood of damage to blood vessels and nerves with screws due to the creation of a three-dimensional model and the use of a three-dimensional graphic editor.

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