Insertion and expansion devices for use in inserting motion discs, and associated methods of use.

The present invention relates to a stabilized ankle prosthesis configured for use in patients with compromised soft tissue in the ankle. The prosthesis of the present invention is a two-component design comprising a stabilizing lip configured to constrain movement in the general direction of compromised soft tissue.

Systems and methods for providing deeper knee flexion capabilities. In some instances, such systems and methods include a knee prosthesis that includes a femoral component for replacing at least a portion of a distal end of a femur. In some cases, the femoral component has a posterior condyle that is configured to articulate against a tibial articular surface. In such cases, an articular surface at a proximal portion of the posterior condyle is sized and shaped to extend at least half of an antero-posterior distance between a most posterior portion of the posterior condyle and a plane that is a continuation of a distal one fourth to one third of a posterior cortex of a femoral shaft of the femur. Other implementations are also discussed.

Systems and methods for providing deeper knee flexion capabilities. In some instances, such systems and methods include a femoral component that is configured to replace a distal portion of a femur. In some cases, the femoral component comprises a first interior surface and a second interior surface that are each configured to contact a resected portion of the femur. Additionally, in some case, the first interior surface and the second interior surface are within about 20 degrees of being parallel with each other. Moreover, in some cases, the femoral component is configured such that when the femoral component is seated on the distal portion of the femur, the first interior surface runs at an angle between about 30 degrees and about 55 degrees with respect to a longitudinal axis of the femur. Other implementations are also discussed.

In one embodiment a method of implanting a prosthetic includes implanting a first member including a concave articulation surface portion defined by a first radius of curvature in a first bone, implanting in a second bone a second member including a first convex articulation surface portion defined by a second radius of curvature and a second convex articulation surface defined by a third radius of curvature, wherein the second convex articulation surface is defined by the lemon portion of a spindle torus and each of the second radius of curvature and the third radius of curvature has a length that is different from the length of the first radius of curvature by less than 0.05 millimeters and wherein the origin of the second radius of curvature is not coincident with the origin of the third radius of curvature, and bringing the first member into slidable contact with the second member

The joint implant of the present invention is fitted into C1-2 lateral joints through the back of the neck instead of oral approach to avoid infections. It is made of 2 inter-digitating components. One part of the joint implant has a circular railing circumference of a circle, the center of which is odontoid, that inter-digitates in a corresponding circular channel of the other part. Two such implants are fixed on both sides of C1-2 joint simultaneously along the circumference. The circular railings provide mainly circular motion in clockwise and anti-clockwise direction. With some degree of play in channel and rail and making the interacting surfaces of the implant convex on convex, provides the gyroscopic motion with lateral and translational movement and also coupling (vertical translation on rotational movement). This gyroscopic design makes it universal and is likely to work in C1-2 joints of every individual with any possible joint orientation.

Systems and methods for providing deeper knee flexion capabilities. In some instances, such systems and methods include an a modular anterior flange that includes a first surface configured to interface with an anterior portion of a distal end of a femur; a second surface configured to articulate against at least one of a patella and a patellar implant; a proximal end; and a distal end, wherein the distal end is configured to interface with a proximal end of an anterior portion of a femoral component that is configured to replace a distal portion of the femur. Other implementations are also discussed.

Systems and methods for providing a tibial prosthesis are disclosed. In some cases, the prosthesis includes a tibial component for replacing at least a portion of a proximal end of a tibia, the tibial component having an undersurface and a stem that extends from the undersurface, wherein the stem is configured to contact an inner, anterior surface of the tibia when the stem is inserted into the tibia and the undersurface of the tibial component is in contact with a cut surface of the tibia. Other implementations are described.

Insertion and expansion devices for use in inserting motion discs, and associated methods of use.

An nucleus prosthesis is disclosed having a plurality of linked segments configured to form, in a closed position, a disc shape. A method includes inserting a plurality of linked segments into an annulus fibrosus and closing the prosthesis so that a first segment inserted into the annulus fibrosus and a last segment inserted into the annulus fibrosus are substantially abutted. Another method includes inserting a plurality of linked segments into an intervertebral disc space and closing the prosthesis so that a first segment inserted into the intervertebral disc space and a last segment inserted into the intervertebral disc space are substantially abutted.