A femoral component (2) for mounting onto a femur and being adapted to articulate with a tibial bearing component in a knee prosthesis comprises proximal end portions (7, 10) adapted to be oriented towards the femur when the femoral component (2) is mounted thereon, and distal end portions adapted to be oriented towards the tibial bearing component when the knee prosthesis is fully extended. The proximal end portions (7) comprise posterior proximal end portions which are located on an posterior side of the femoral component and an anterior proximal end portion (10) which is located on an anterior side of the femoral component (2). The femoral component (2) further comprises a medial condyle (13) and a lateral condyle (14) which each extend from one of the posterior proximal end portions beyond the distal portions and towards the anterior proximal end portion (10) of the femoral component (2). The medial and lateral condyles (13, 14) form a condylar gap between each other, wherein the medial condyle (13) and the lateral condyle (14) are shaped to articulate with the tibial bearing component through a range of motion, in which a full extension of the knee prosthesis corresponds to zero degrees flexion of the knee prosthesis and positive flexion corresponds to greater than zero degrees flexion of the knee prosthesis. The femoral component (2) further comprises a sagittal plane extending in a proximal/distal direction and further extending through the condylar gap from the anterior side to the posterior side of the femoral component (2). A patellar groove (16) extends from the condylar gap towards the anterior proximal end portion (10) of the femoral component (2) along a mathematical curve (17). The mathematical curve (17), when looking onto the anterior side of the femoral component, is canted towards a medial side (18) of the femoral component (2) relative to the sagittal plane when the patellar groove (16) extends proximally.

The patellar groove (16) is formed by a concave groove section (19) on the anterior side of the femoral component (2), the groove section (19) having a groove base (20). The femoral component (2) further comprises a medial ridge section (21) and a lateral ridge section (22) which are disposed adjacent the groove section (19) and each have a convex shape. The medial ridge section (21) forms the medial condyle (13) and a medial extension (23) to the medial condyle (13) towards

A hinge knee system includes a tibial assembly having a baseplate component and an axle component. The baseplate component has an opening that extends therein from a proximal end toward a distal end thereof. The axle component has a shaft portion receivable within the opening of the baseplate component and an axle connected to the shaft portion that extends in a direction transverse to a longitudinal axis of the shaft portion. The system also includes a femoral assembly that includes a distal femoral component. The distal femoral component includes condylar portions and an intercondylar portion disposed between the condylar portions. The intercondylar portion includes a bearing surface that defines a recess configured to rotatably receive the axle for articulation therewith.

A hinge knee system includes a tibial assembly having a baseplate component and an axle component. The baseplate component has an opening that extends therein from a proximal end toward a distal end thereof. The axle component has a shaft portion receivable within the opening of the baseplate component and an axle connected to the shaft portion that extends in a direction transverse to a longitudinal axis of the shaft portion. The system also includes a femoral assembly that includes a distal femoral component. The distal femoral component includes condylar portions and an intercondylar portion disposed between the condylar portions. The intercondylar portion includes a bearing surface that defines a recess configured to rotatably receive the axle for articulation therewith.

A system and method for sharing and absorbing energy between body parts. In one aspect, the method involves identifying link pivot locations, fixing base components and minimally invasive insertion techniques. In one particular aspect, the system facilitates absorbing energy between members forming a joint such as between articulating bones.

A knee prosthesis comprises a femoral component for securement to a femur, the femoral component defining medial and lateral J-shaped condyles and an intercondylar groove; and a fixed bearing tibial component for securement to a tibia, the tibial component having respective bearing surfaces which are fixed with respect to both a tibial engaging component and a stabilising peg for securing the tibial component to a tibia, the respective bearing surfaces being shaped to engage with said condyles both when the knee, in use, is extended and also over a range of flexion.

A method of evaluating a human joint which includes two or more bones and ligaments, wherein the ligaments are under anatomical tension to connect the bones together, creating a load-bearing articulating joint. The method includes: defining locations of one or more sockets, each socket representing a ligament attachment point to bone; interconnecting the one or more sockets with mathematical relationships that describe the kinematic physics of the one or more sockets relative to one another; providing spatial information to describe the movement of the sockets relative to one another; defining an initial kinematic state of the joint; defining a final kinematic state of the joint; using computer-based system to compute a difference between the initial and final kinematic states; and using a computer-based system to compute modifications to the mathematical relationships of the sockets to achieve a final kinematic state.

A knee prosthesis includes a femoral component, a tibial component, and a coupling component interconnecting the femoral component and the tibial component. The tibial component includes ball. The femoral component is configured to move relative to the tibial component. The coupling component defines an internal cavity including a first spherical end portion and a second spherical end portion. The internal cavity is dimensioned to receive the ball of the tibial component. The ball is repositioned between the first spherical end portion and the second spherical end portion of the internal cavity upon movement of the femoral component relative to the tibial component.

An artificial joint implant (1) comprising a first element (2) with a socket (4) and a second element (3) with a ball head (5), wherein said ball head (5) is insertable in said socket (4) such as to form a ball-and-socket connection between said first element (2) and said second element (3), and the movement of said ball head (5) in said socket (4) is restricted by means of a protrusion (6.1; 6.2) engaged in a groove (7), whereby said protrusion (6.1; 6.2) has a central axis A2 and is protruding from the surface of said socket (4) and said groove (7) is provided on the surface of said ball head (5) or vice versa; said groove (7) is positioned along a great circle of said ball head (5) or of said socket (4), said protrusion (6.1; 6.2) has a shape allowing rotation of the protrusion around its central axis A2 when received in the groove (7); andthe surface roughness of the protrusion (6.1; 6.2) and/or of the groove (7) is at most 25 micrometers.

A knee prosthesis includes a femoral component, a tibial component, and a coupling component interconnecting the femoral component and the tibial component. The tibial component includes ball. The femoral component is configured to move relative to the tibial component. The coupling component defines an internal cavity including a first spherical end portion and a second spherical end portion. The internal cavity is dimensioned to receive the ball of the tibial component. The ball is repositioned between the first spherical end portion and the second spherical end portion of the internal cavity upon movement of the femoral component relative to the tibial component.

A hinge knee system includes a tibial assembly having a baseplate component and an axle component. The baseplate component has an opening that extends therein from a proximal end toward a distal end thereof. The axle component has a shaft portion receivable within the opening of the baseplate component and an axle connected to the shaft portion that extends in a direction transverse to a longitudinal axis of the shaft portion. The system also includes a femoral assembly that includes a distal femoral component. The distal femoral component includes condylar portions and an intercondylar portion disposed between the condylar portions. The intercondylar portion includes a bearing surface that defines a recess configured to rotatably receive the axle for articulation therewith.