Total Knee Prostheses and Method for the Assembly Thereof

A total knee prosthesis comprising:

• a femoral implant and a tibial implant, each being modular between a first posterior stabilization assembly configuration and a second rotary hinge assembly configuration;
• the femoral implant comprising a femoral interchangeable part adapted to each assembly configuration and a femoral common part to both assembly configurations that includes at least one anchoring pivot at an upper portion and attachable in a femur, an anterior wall corresponding to a forward orientation of the prosthesis and two curved branches extending in a posterior direction from the anterior wall, forming condyles and separated by a hollow intercondylar space in a form of a groove that is defined by an inner edge of the condylar branches and an inner face of the anterior wall;
• the tibial implant comprising a tibial interchangeable part adapted to each assembly configuration, and a tibial common part to both assembly configurations that includes at least one anchoring pivot at a lower portion and attachable in a tibia, and a support plate configured to support a load of the condyles of the femoral implant;
• wherein the femoral implant includes at least one or both of:
• at least one transversal element to removably attach at least a first femoral interchangeable part to the femoral common part, the transversal element being perpendicular to the branches and configured to close the intercondylar groove on its posterior face and to form a cage to receive a posterior stabilization pin of the tibial implant, and
• at least one transversal shaft to removably attach a second femoral interchangeable part to the femoral common part, the transversal shaft being perpendicular to the branches and configured to support and articulate a balance arm extending from the intercondylar groove beyond the condylar surfaces and suitable in this configuration for being inserted and engaging in a hollow portion of a base of the anchoring pivot of the tibial implant.

A method for the assembly of a total knee prosthesis comprising:

• assembling femoral and tibial implant parts, each having respective common parts and each respectively attachable in a femur and a tibia of a knee;
• selecting a respective interchangeable part for modular assembly onto the respective common parts for each implant and, depending on a posterior stabilization assembly configuration or a rotary hinge assembly configuration;
• and,
• assembling a selected interchangeable part with a femoral implant common part and assembling a selected interchangeable part with a tibial implant common part.