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.

The present disclosure relates to an animal knee joint implant that reflects an anatomical structure of an animal. More particularly, the present disclosure relates to an animal knee joint implant that reflects the anatomical structure of an animal, wherein the knee joint implant is capable of being used for diseases, which are accompanied by bone loss, damage to surrounding muscles, ligaments, and the like and are thus more complex than general knee joint diseases such as rheumatoid arthritis and degenerative arthritis, and wherein the animal knee joint implant is capable of reinforcing stability against varus and valgus as well as stability against flexion and extension, and capable of easily complementing gaps that may occur when the bones of a joint are cut.

A total ankle prosthesis that includes a talar component that has a bone contacting side for contacting a talus and an articular side opposite the bone contacting side. The articular side has first and second condyles separated by an intercondylar notch. The first condyle defines a spheroidal convex surface. The prosthesis also includes a tibial component that has a bone contacting side for contacting a tibia and an articular side. The articular side has first and second condyles separated by an intercondylar spine. The first condyle of the tibial component defines a concave surface. The concave surface has a condylar edge that defines a perimeter thereof and a plurality of articular portions positioned between anterior and posterior extents of the condylar edge. A first articular portion of the articular portions is spheroidal and a second articular portion is defined by a cylindrical helix.

Medical devices in accordance with various embodiments of the present invention employ one or more coaxial screw gear sleeve mechanisms. In various embodiments, coaxial screw gear sleeve mechanisms include a post with a threaded exterior surface and a corresponding sleeve configured to surround the post, the corresponding sleeve having a threaded interior surface configured to interface with the threaded exterior surface of the post and a geared exterior surface. A drive mechanism can be configured to interface with the geared exterior surface of the sleeve, causing the device to expand.

An orthopaedic joint replacement system is shown and described. The system includes a number of prosthetic components configured to be implanted into a patient's knee. The system also includes a number of surgical instruments configured for use in preparing the bones of the patient's knee to receive the implants. A method or technique for using the surgical instruments to prepare the bones is also disclosed.

A method and system for femoral condylar resection arthroplasty (FCRA) of the knee, which preserves the undamaged meniscus, whether by arthroscopy or arthrotomy, and only replaces the damaged area of the femoral condyle. In one embodiment, both the distal and posterior femoral condyle are replaced with a two piece femoral two-piece distal and posterior femoral condyle component. This two piece component has a metal piece and a plastic piece removably attached in a tongue and groove arrangement. This arrangement allows the plastic piece to be removed when converting the FCRA into a unicompartmental arthroplasty.

An orthopaedic joint replacement system is shown and described. The system includes a number of prosthetic components configured to be implanted into a patient's knee. The system also includes a number of surgical instruments configured for use in preparing the bones of the patient's knee to receive the implants. A method or technique for using the surgical instruments to prepare the bones is also disclosed.

An artificial joint is characterized by: having a first member including a caput part on which a prescribed curved surface is formed, and a second member including a fossa part having a surface which abuts the prescribed curved surface of the caput part; the second member being rotatable in a flexing direction of a joint with a prescribed point on the caput part being the center of rotation; and the prescribed curved surface of the caput part being defined by a curve which depicts a convex arc toward the side abutting the fossa part when the caput part is viewed from the axial direction of the rotation, and in which, when two arbitrary points are taken on the curve, the radius of curvature of the point positioned further toward the flexing side of the joint on the curve is smaller than the radius of curvature of the other point.

An orthopaedic joint replacement system is shown and described. The system includes a number of prosthetic components configured to be implanted into a patient's knee. The system also includes a number of surgical instruments configured for use in preparing the bones of the patient's knee to receive the implants. A method or technique for using the surgical instruments to prepare the bones is also disclosed.

An orthopaedic surgical instrument system includes a hinged tibial insert trial and a tibial base trial. A post adapter is sized to be positioned over a post of the tibial base trial and to be positioned in a central opening defined in the hinged tibial insert trial. The hinged tibial insert trial includes a housing configured to be received in a femoral component and a button mechanism to selectively secure the hinged tibial insert trial to the femoral component. The system may include a shim trial sized to be attached to an inferior surface of the hinged tibial insert trial.