TALAL HEAD ENDOPROSTHESIS AND METHOD OF ITS IMPLANTATION Russian patent published in 2023 - IPC A61F2/42 

FIELD: medicine.

SUBSTANCE: endoprosthesis of the head of the talus contains a distal articular head with a pedicle. The distal articular head is made in the form of a convex hemisphere, with a truncated lower surface. Longitudinal and transverse grooves are made on the back side of the distal articular head. The pedicle of the distal articular head is made in the form of a clover leaf, has at least three longitudinal ribs and passes through the center of the back side of the distal articular head and is inclined downwards to it. The method of implantation of the above endoprosthesis is as follows: cementless fixation of the above endoprosthesis is carried out, while arthrotomy of the talonavicular joint is performed, followed by marginal resection of the affected areas of the cartilaginous surface of the head of the talus and navicular bones. The neck of the talus is isolated, a jig is installed on it with a predetermined angle of cut of the head of the talus in accordance with the inclination of the pedicle relative to the distal articular head of the above endoprosthesis. The resection of the articular surface of the head of the talus is performed along the guide. The stump of the neck of the talus is brought out into the wound along the anterior surface. A guide pin is inserted along the central axis of the neck of the talus. X-ray control is performed to confirm the correct location of the guide pin. A channel for the leg of the above endoprosthesis is formed along the spoke using a cannulated rasp. The rasp and needle are then removed. The above-mentioned endoprosthesis is installed in the formed channel in the neck of the talus and finished off with a concave impactor. The head of the above endoprosthesis is set into the articular cavity of the navicular bone.

EFFECT: inventions provide reduction of postoperative healing terms and restoration of the function of the talonavicular joint by restoring its mobility in the postoperative period with the possibility of correcting midfoot deformities.

6 cl, 11 dwg