A hinged articulating spacer system for revision knee arthroplasty includes a femur rod for a femur, and a tibia rod for a tibia. The tibia rod is hingedly couplable to the femur rod to form a hinged rod assembly. A pre-formed femoral spacer component includes bone cement impregnated with an antibiotic. The pre-formed femoral spacer defines an opening that receives the hinged rod assembly. A pre-formed tibial spacer component includes bone cement impregnated with an antibiotic. The pre-formed tibial spacer defines an opening that receives the hinged rod assembly.

A system including a prosthesis assembly for a constrained knee including a tibial baseplate, a mobile bearing, and a fixed bearing. The tibial baseplate can include a distal surface and a proximal surface that can be configured to receive a hinge post. The mobile bearing can be configured to couple with the tibial baseplate and to rotate about at least a first axis approximated by a centerline of the hinge post. The rotation about at least the first axis can be limited by at least the first engagement feature. The fixed bearing can be configured to be coupled to the tibial baseplate. The fixed bearing can be restrained from rotating about the first axis by at least the first engagement feature of the tibial baseplate. The tibial baseplate can be configured to be assembled with either the mobile bearing or the fixed bearing.

A prosthesis assembly can include a tibial tray, a tibial bearing component, a hinge post, a femoral component, a shackle, walls, a hinge axle, and a bump stop. The hinge post can extend through the tibial bearing component and be at least partially received in a recess of the tibial tray. The femoral component can contact an articular surface of the tibial bearing component. The shackle can be coupled to the hinge post and configured to be inserted between a medial and a lateral condyle of the femoral component. The walls can be positioned between the femoral component and the shackle. The hinge axle can be configured to secure the femoral component to the shackle. The bump stop can be removably attached to the femoral component and configured to contact the shackle at a set limit of rotation of the femoral component relative to the tibial bearing component.

The invention relates to a knee endoprosthesis comprising a femoral component (1) which has two condylar surfaces (1a, 1b) for anchoring on the distal femur, comprising a tibial component (2) for anchoring on the proximal tibia, and comprising sliding surfaces between the two components (1, 2). It is proposed according to the invention that the entire femoral component (1), but at least its condylar surfaces (1a, 1b) are made of a solidly sintered ceramic for articulation with the tibial component (2), so that the knee endoprosthesis will have the least possible amount of abrasion with optimal reproduction of the anatomical and kinematic properties of the natural knee joint, in particular through suitable combinations of materials and by reducing the abrasion-generating surfaces. This is achieved by the fact that the tibial component (2) comprises a tibial baseplate (11) made of a solidly sintered ceramic which has a medial spherical bearing shell (7) on the upper face of the baseplate facing the femoral component (1). The medial spherical bearing shell (7) is an integral component of the tibial baseplate (11) and is formed in one piece with it, and the articulation surface of the medial femur condyle (1a) is also designed to be spherical, and together with the medial spherical bearing shell (7), forms a congruent ball joint. Laterally adjacent to the medial spherical bearing shell (7), a bearing shell (8) which enables rotation of the femoral component (1) and is formed by multiple radii in the anterior-posterior direction is arranged non-congruently with the femoral condyle (1b) and is either formed integrally with the tibial baseplate (11) or is an inlay that is movable relative to the tibial baseplate (11).

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.

The implantable prosthesis for replacing a human knee joint comprises a femoral prosthetic element (12) and a tibial prosthetic element (14) which are articulated with one another by means of a joint device (30) for the purpose of executing a knee bend. The tibial prosthetic element (14) has a through-opening (40) for the passage of a tool (84), a rod-like shaft anchoring part (32) or an intramedullary lengthening nail (80). In order to reduce the extent of a surgical intervention and thus the risk of infection also for the lengthening of the tibia, the joint device (30) is designed such that it forms a guide channel (42) for the passage of the tool (84), the rod-like shaft anchoring part (32) or the intramedullary lengthening nail (80) from the outside, which guide channel is in alignment with the through-opening (40) and is in connection therewith when the tibial prosthetic element (14) and the femoral prosthetic element (12) are arranged at a predetermined angle relative to one another in a functional position corresponding to a knee bend.

The present invention relates to an orthopedic device intended to equip a joint comprising an upper lever and a lower lever, the orthopedic device comprising an upper cam and a plate, the upper cam being joined to an upper fastening element provided to rigidly connect the upper cam to the upper lever, the plate being joined to a lower fastening element provided to rigidly connect the plate to the lower lever, characterized in that the upper cam has a cam surface whose generatrix has a convex curved profile, in the sagittal plane, and in that the plate and/or the upper cam are each connected to the associated fastening element by a single fastening rod.

The invention relates to a knee joint endoprosthesis has a tibia part, a femur part, a meniscus part arranged on the tibia part in mutually non-rotatable manner and a connecting device for connecting the tibia part to the femur part in articulated manner. Said femur part comprises at least one femur condyle having a femur condyle surface. Said meniscus part comprises at least one upper surface which faces the femur part and has at least one meniscus joint surface which touches the femur condyle surface of the at least one femur condyle. Said femur part and the tibia part are mounted such as to be rotatable relative to each other about a rotational axis.

A total knee replacement prosthesis assembly (10) comprising a femoral component (20), a tibial component (30) having a tibial platform (32), and a bearing component (40), the bearing component having an inferior side (40b) and a superior side (40a), the bearing component being adapted to be arranged between the femoral component and tibial platform when assembled, the tibial platform having a post (36) upstanding from it and the bearing component having a post recess (46) in its inferior side for receiving the post, the bearing component being rotatable about the post when assembled, the post and bearing component each having a transverse bore and the assembly further comprising an axle (60), at least part of the axle being received through the transverse bore (38) in the post when assembled and at least part of the axle being received through the transverse bore (52) in the bearing component when assembled, the axle being configured to provide an axis of rotation between the femoral component and bearing component which is fixed relative to the femoral component and the bearing component in use.

Methods, systems, and devices for replacement of a joint with a prosthetic system that replicates the natural kinematics of the joint is disclosed. A prosthetic system according to one embodiment includes a tibial component having a tibial plateau and a tibial stem portion, the tibial plateau having a top side and a bottom side, a tibial insert, with a bearing surface, adapted to be positioned on the top side of the tibial plateau, a femoral component having a base portion and a central housing, the femoral component having an axis of extension-flexion rotation, the base portion having a pair of condyles, an a mechanical linkage component linking the tibial component with the femoral component and with the tibial insert in between the tibial component and the femoral component, so that there is a center of contact between the condyles and the bearing surface.