METHOD OF KNEE JOINT ARTICULATING SPACER DEVICE FITTING WITH FEMORAL DISTAL METAEPIPHYSIS MARGINAL DEFECT Russian patent published in 2019 - IPC A61B17/56 

FIELD: medicine.

SUBSTANCE: invention refers to medicine, particularly to traumatology and orthopedics, and can be used in treating peri-prosthetic knee joint infection after total endoprosthesis replacement with marginal defect of distal femoral metaepiphysis. Endoprosthesis is removed. Debridement is carried out. Spacer consisting of official endoprosthesis components is used. In preoperative planning, X-ray examinations are performed, including computed tomography with 3D modeling, to determine femoral defect, length of screws is determined to create support points for anatomic femoral component of endoprosthesis. Intraoperative removal of the endoprosthesis is followed by fitting-in the implant components of the endoprosthesis. Correction of deficiency is carried out by introducing spongious screws into spongy bone by at least 50 % of its length to feel stable attachment, which is checked by "swinging" tests, angular load on screw cap screwdriver, wherein the spongious screws are introduced so that the screw head is parallel to the endoprosthesis component inner surface. Then, the template of the official hip component is reapplied. If necessary, screw height adjustment is performed until clearance between inserted screws and template in contacting points is 1 mm. After establishing absence of dislocation and presence of correct axial orientation of the template, the officinal femoral component of the spacer is coated with bone cement impregnated with antibiotics, selecting the amount of cement so as to completely fill the bone deficit around the screws. Then, femoral and tibial components of the endoprosthesis are installed. Performing the height of the official insert of the endoprosthesis taking into account the determination of lateral stability and absence of recurrent joint. Insert is implanted into slots of tybial platform.

EFFECT: method provides stable fixation of the femoral component of the spacer, reduction of the infectious process by correcting bone deficit in the area of defect of distal metaepiphysis of the femoral bone when fitting the femoral component of the spacer.

1 cl, 3 dwg, 1 ex