A knee joint prosthesis system for implantation in a first knee joint of a patient. The first knee joint has a condition. The knee joint prosthesis system includes a tibial baseplate component, a femoral component having a femoral articulation surface, and a tibial insert. The tibial insert includes a tibial articulation surface configured to articulate with the femoral articulation surface. The tibial articulation surface includes a medial tibial compartment asymmetrical to a lateral tibial compartment. The tibial articulation surface is shaped to cooperate with the femoral articulation surface to adapt kinematics of the first knee joint having the condition and the tibial articulation surface is also suitable for implantation in a second knee joint on a second side, the second knee joint lacking the condition.

An artificial joint is provided. The artificial joint may comprise: a first joint member including a first bone replacement part, and a (1-1).sup.st branch and a (1-2).sup.st branch branched from opposite sides of the first bone replacement part; a second joint member including a second bone replacement part, and a (2-1).sup.nd branch and a (2-2).sup.nd branch branched from opposite sides of the second bone replacement part; a first main string connecting one side of the (1-1).sup.st branch and one side of the (2-1).sup.nd branch; a second main string connecting the one side of the (1-1).sup.st branch and one side of the (2-2).sup.nd branch; a third main string connecting one side of the (1-2).sup.st branch and the one side of the (2-1).sup.nd branch; and a fourth main string connecting the one side of the (1-2).sup.st branch and the one side of the (2-2).sup.nd branch.

An intervertebral implant inserter, comprising: a) a elongated central body having a distal end, a proximal end, an outer surface, and a longitudinal throughbore therethrough, b) upper and lower blades, each blade having a distal end portion and a base portion, the base portion of each blade pivotally coupled to the elongated central body, c) a shaft having a longitudinal axis, wherein the shaft is advanceable within the throughbore and rotatable about the longitudinal axis, the shaft having a distal end forming a pusher having an acicular transverse cross-section, d) upper and lower endplates respectively detachably connected to the distal end portion of a respective blade.

A femoral assembly includes a femoral component that includes condylar portions and an anterior flange portion. The condylar portions and anterior flange portion together define an outer side of the femoral component for articulating with a tibial prosthesis and an inner bone facing side opposite the outer side. The inner bone facing side defines five intersecting component inner surfaces that each extend from a lateral side of the femoral component to a medial side thereof. A femoral augment includes condylar portions and an anterior flange portion. The condylar portions and anterior flange portion together define an outer side of the femoral augment comprised of five intersecting augment outer surfaces and an inner side comprising no more than three intersecting augment inner surfaces. The augment outer surfaces correspond to the component inner surfaces of the femoral component. The augment inner surfaces correspond to resected surfaces of a distal femur.

A knee joint prosthesis is configured to move between an extended position and a flexion position. The knee joint prosthesis includes a femoral component configured to be mounted to a femur, and a tibial component configured to be mounted to a tibia. The tibial component is configured to engage the femoral component to form the knee joint prosthesis. A post is fixedly connected to one of the femoral component and the tibial component and has a helical surface at a terminal end thereof. A recess is defined on the other of the femoral component and the tibial component and has a helical surface. The helical surfaces of the post and recess are configured to engage in order to cause relative rotation between the femoral and tibial components as the knee joint prosthesis moves between the extended and flexion positions.

The presented invention is a system for performing reverse ankle replacement in the setting of ankle joint osteoarthritis, and other degenerative conditions of the ankle joint including avascular necrosis. The presented tibial and talar components can be implanted in a cement-less or cemented fashion. The prosthesis of the presented invention consists of (1) a tibial component which includes a planar undersurface with porous texture applied to its upper, non-bearing surfaces, (2) a talar component which includes a bearing surface which is concave, (3) a polyethylene component which includes a bearing undersurface which is convex, and (4) multiple talar component embodiments with or without flanges and/or screw holes for accommodation of bone screws for additional fixation and for permitting sub-talar joint fusion.

According to one example, a bearing component for a knee arthroplasty is disclosed. The bearing component can optionally comprise any one or combination of: a medial compartment having an medial articular surface with a medial articular track and having a first thickness as measured at the medial articular track between the medial articular surface a medial distal surface; and a lateral compartment having a lateral articular surface with a lateral articular track and having a second thickness as measured at the lateral articular track between the lateral articular surface a lateral distal surface; wherein the medial articular surface at the medial articular track and the lateral articular surface at the lateral articular track each have an inclination so as to form an acute angle with respect to a resected proximal surface of a tibia.

According to one example, a bearing component for a knee arthroplasty is disclosed. The bearing component can optionally comprise any one or combination of: a medial compartment having an medial articular surface with a medial articular track and having a first thickness as measured at the medial articular track between the medial articular surface a medial distal surface; and a lateral compartment having a lateral articular surface with a lateral articular track and having a second thickness as measured at the lateral articular track between the lateral articular surface a lateral distal surface; wherein the medial articular surface at the medial articular track and the lateral articular surface at the lateral articular track each have an inclination so as to form an acute angle with respect to a resected proximal surface of a tibia.

A knee joint prosthesis for a tibia and femur can include a tibial component, a tibial bearing, and a post. The tibial bearing can include a first bearing portion, a second bearing portion, and an aperture. The first bearing portion can be positionable on a first side of the sagittal axis and can have a first shape. The second bearing portion can be positionable on a second side can have a second shape different than the first shape. The post, together with the first bearing portion and the second bearing portion, can be configured to promote the femur to pivot substantially about the first bearing portion.

A joint prosthesis system includes a femoral component that has an articular side, a bone facing side, and medial and lateral condylar portions. The medial and lateral condylar portions at least partially define an intercondylar recess located therebetween and have a first concave surface extending in a mediolateral direction across the medial and lateral condylar portions. A first modular component has a second concave surface and is connectable to the femoral component such that, when the first modular component is connected to the femoral component, the first and second concave surfaces come together to form a transverse opening extending in the mediolateral direction. A first tibial assembly has a baseplate component and a head extending therefrom. The head defines an axle opening that extends therethrough. An axle is configured to be received within the transverse opening and axle opening so as to connect the tibial assembly to the femoral component.