METHOD AND INSTRUMENTS FOR ASSEMBLY OF ORTHOPEDIC PROSTHESIS Russian patent published in 2022 - IPC A61F2/46 A61F2/38 

FIELD: medicine.

SUBSTANCE: method for the assembly of a tibial component of a knee joint prosthesis, according to the first option, includes the use of a tibial test structure and a surgical instrument. The tibial test structure contains a test base that forms the first axis and a test displacement adapter that forms the second axis offset relatively to the first axis. The surgical instrument includes a support platform and a stabilizing bracket. The tibial displacement adapter includes the distal end, which forms the fourth axis offset relatively to the third axis. Actions of the method, according to the first option, include the combination of the tibial test structure with the surgical instrument, placement of the tibial test structure on the support platform, rotation of the support platform to place the first axis and the second axis in a plane passing vertically through the stabilizing bracket, extension of the stabilizing bracket along the vertically passing plane to engage the stabilizing bracket with the tibial test structure, locking of the support platform to prevent rotation relatively to the stabilizing bracket, placement of the tibial prosthesis component on the support platform after removal of the tibial test structure so that the third axis formed by a distal pin of the tibial prosthesis component is located in the plane, placement of the tibial displacement adapter on the distal pin, rotation of the distal end of the tibial displacement adapter to place the fourth axis in the vertically passing plane, and attachment of the tibial displacement adapter to the tibial prosthesis component, while the third axis and the fourth axis are located in the plane. The method for the assembly of the tibial component of the knee joint prosthesis, according to the second option, includes the rotation of the support platform of the surgical instrument around a vertically passing axis, attachment of a holder to the support platform, placement of the first tibial prosthesis component on the holder, while the first tibial component includes a tibial groove and a pin extending from the tibial groove, extension of the first clamping bar of the holder into engagement with the tibial groove to attach the tibial groove between the first clamping bar and the second clamping bar of the holder, and the attachment of the second tibial prosthesis component on the pin of the first tibial prosthesis component, wherein the attachment of the second tibial prosthesis component to the pin of the first tibial prosthesis component includes a shift of the second tibial prosthesis component along a tapering outer surface of the pin for attachment of the second tibial prosthesis component to the pin, while the second tibial prosthesis component includes a stepped outer surface, wherein the attachment of the second tibial prosthesis component to the pin of the first tibial prosthesis component additionally includes the connection of the first end of an impactor to the distal end of the second tibial prosthesis component and the application of force to the second end of the impactor. The method for the assembly of the tibial component of the knee joint prosthesis, according to the third option, includes the use of a test prosthesis node and a surgical instrument. The surgical instrument includes a support platform and a stabilizing bracket. The test prosthesis node contains a test prosthesis component, which forms the first axis, and a test displacement adapter, which forms the second axis offset relatively to the first axis. The displacement adapter includes an end that forms the fourth axis offset relatively to the third axis by amount equal to the offset of the first axis and the second axis. Actions of the method, according to the third option, include the combination of the test prosthesis node with the surgical instrument, placement of the trial prosthesis node on the support platform, rotation of the support platform to place the first axis and the second axis in a plane passing vertically through the stabilizing bracket, extension of the stabilizing bracket along the vertically passing plane to engage the stabilizing bracket with the test prosthesis node, locking of the support platform to prevent rotation relatively to the stabilizing bracket, location of the prosthesis component on the support platform after removal of the test prosthesis node so that the third axis formed by the pin of the prosthesis component is in the plane, while dimensions and shape of the prosthesis component correspond to dimensions and shape of the test prosthesis node, placement of the displacement adapter on the pin, rotation of the end of the displacement adapter to place the fourth axis in the vertically passing plane, and attachment of the displacement adapter to the prosthesis component, while the third axis and the fourth axis are located in the plane.

EFFECT: inventions provide the possibility of assessment of the fit, range of movement and other parameters of the patient’s joint and helping the surgeon in choosing components of an orthopedic prosthesis for implantation.

19 cl, 47 dwg