METHOD FOR REPLACEMENT OF DEFECTS OF PROXIMAL TIBIA WHEN PERFORMING KNEE JOINT ENDOPROSTHESIS REPLACEMENT AND DEVICE FOR ITS IMPLEMENTATION

FIELD: medicine.SUBSTANCE: invention refers to medicine, namely to traumatology and orthopedics, and can be used for replacement of defects of proximal tibia when performing knee joint replacement. At the stage of preoperative planning performing, through multispiral computed tomography data, constructing a three-dimensional model of a proximal tibia with a defect and a defect-substituting augment by additive techniques, as well as taking into account the shape of the tibial component of the endoprosthesis and the planned augment with their mutual positioning. Individual shape of the augmentation body is determined taking into account the bone defect configuration. Plane and porous zones of its surface are planned and planned on 3D-models of augment. Thickness of its walls is planned by means of virtual reconstruction necessary axes relative to bone reference points. Final version of the augment completely compensating for the existing bone defect and a congruent adherent surface of the tibial component of the endoprosthesis is created. At next stage 3D-printing of plastic prototype of augment and plastic model of proximal tibia with bone defect is carried out. After fitting and fitting by smoothing the bone defect edges to facilitate the augmentation taking into account the tibial component of the endoprosthesis. After its fitting using the tibial component of the endoprosthesis, 3D printing of the augmentation of powdered titanium is performed in full compliance with created 3D-model. At the stage of the reconstructive surgery, an initially planned augmentation to the defect of the proximal shin of the shinbone is first established. After achieving the required congruence, the standard tibial component of the endoprosthesis is installed using the bone cement under the required angle of inclination and taking into account the planned axes and anatomical landmarks. If necessary, CT images of the contralateral tibia are used, by means of virtual reconstruction the sites of future attachment of soft tissue periarticular structures are planned, in which ligatures are planned, the edges of the bone defect are smoothed and the scar tissue is excised. Device for method implementation includes hollow body with porosity consisting of diaphyseal and metaphyseal parts. Body in strictly personified form, preferable for each specific patient, is made using additive technologies based on three-dimensional modeling at the stage of surgical intervention planning. Body is