Abstract: A tibial knee joint prosthesis for attachment to a suitably prepared tibial bone, providing bearing portions in the lateral and medial compartments. The lateral and medial bearing surfaces of the component are inclined at different angles in the anterior to posterior direction of the knee, so that when mounted to the tibia, the lateral bearing surface of the prosthesis is higher than the medial bearing surface to the posterior side of the knee. In this way the lateral ligament is tightened progressively more than the medial ligament as the knee moves from extension to flexion, resulting in increased stability in the lateral compartment.

Abstract: A tibial knee joint prosthesis for attachment to a suitably prepared tibial bone, providing bearing portions in the lateral and medial compartments. The lateral and medial bearing surfaces of the component are inclined at different angles in the anterior to posterior direction of the knee, so that when mounted to the tibia, the lateral bearing surface of the prosthesis is higher than the medial bearing surface to the posterior side of the knee. In this way the lateral ligament is tightened progressively more than the medial ligament as the knee moves from extension to flexion, resulting in increased stability in the lateral compartment.

Abstract: A tibial knee joint prosthesis for attachment to a suitably prepared tibial bone, providing bearing portions in the lateral and medial compartments. The lateral and medial bearing surfaces of the component are inclined at different angles in the anterior to posterior direction of the knee, so that when mounted to the tibia, the lateral bearing surface of the prosthesis is higher than the medial bearing surface to the posterior side of the knee. In this way the lateral ligament is tightened progressively more than the medial ligament as the knee moves from extension to flexion, resulting in increased stability in the lateral compartment.

Abstract: A bearing component 2 for a joint replacement prosthesis comprises a first bearing element 4; a second bearing element 6, and a linking element 8, operatively connecting the first and second bearing elements 4, 6 and permitting relative motion there between. The flexible linking element 8 prevents dislocation of mobile bearings in a total knee replacement prosthesis. The invention also relates to a bridging element which retains the linking element 8 with some play, which acts as a ligament support 2051, and which causes a deflection of the line of action of a ligament 1018. A joint replacement prosthesis is also disclosed comprising a biasing element 1140 or a tensioning element 1220 operatively coupled to the artificial ligament 1018. The biasing element 1140 or tensioning element 1220 may be housed in the stem of a tibial tray 1006.

Abstract: A tibial knee joint prosthesis for attachment to a suitably prepared tibial bone, providing bearing portions in the lateral and medial compartments. The lateral and medial bearing surfaces of the component are inclined at different angles in the anterior to posterior direction of the knee, so that when mounted to the tibia, the lateral bearing surface of the prosthesis is higher than the medial bearing surface to the posterior side of the knee. In this way the lateral ligament is tightened progressively more than the medial ligament as the knee moves from extension to flexion, resulting in increased stability in the lateral compartment.

Abstract: Prosthesis for implantation in the knee having a tibial component for attachment to the tibia. The tibial component has a first, upper surface and a second, lower surface opposite the first surface for attachment to the tibia. The first surface includes a lateral bearing region having a convex form and a medial bearing region having a flat form, arranged such that the respective angles of inclination in sagittal planes of the lateral and medial bearing regions of the component in situ when fitted to the tibia are different.

Abstract: A bearing component 2 for a joint replacement prosthesis comprises a first bearing element 4; a second bearing element 6, and a linking element 8, operatively connecting the first and second bearing elements 4, 6 and permitting relative motion there between. The flexible linking element 8 prevents dislocation of mobile bearings in a total knee replacement prosthesis. The invention also relates to a bridging element which retains the linking element 8 with some play, which acts as a ligament support 2051, and which causes a deflection of the line of action of a ligament 1018. A joint replacement prosthesis is also disclosed comprising a biasing element 1140 or a tensioning element 1220 operatively coupled to the artificial ligament 1018. The biasing element 1140 or tensioning element 1220 may be housed in the stem of a tibial tray 1006.

Abstract: A tibial knee joint prosthesis for attachment to a suitably prepared tibial bone, providing bearing portions in the lateral and medial compartments. The lateral and medial bearing surfaces of the component are inclined at different angles in the anterior to posterior direction of the knee, so that when mounted to the tibia, the lateral bearing surface of the prosthesis is higher than the medial bearing surface to the posterior side of the knee. In this way the lateral ligament is tightened progressively more than the medial ligament as the knee moves from extension to flexion, resulting in increased stability in the lateral compartment.

Abstract: In or for a prosthetic knee joint device involving a femoral component having a convexly curved articulation surface, a tibial component (10) having a relatively flattened articulation surface (14), and a meniscal component (20) having two articulation surfaces (21,22) in back-to-back disposition and respectively substantially complementary to, and for mutual engagement with, the femoral and tibial component articulation surfaces: an assembly of tibial and meniscal components including means (30) separably connectable with the tibial component at least partially to bridge the meniscal component to retain their mutual articulatory engagement.

Abstract: In or for a prosthetic knee joint device involving a femoral component having a convexly curved articulation surface a tibial component having a relatively flat articulation surface, and a meniscal component having two articulation surfaces in back-to-back disposition and respectively substantially complementary to, and for mutual engagement with, the femoral and tibial component articulation surfaces: an assembly of tibial and meniscal components including member separably connectable with the tibial component at least partially to bridge the meniscal component to retain their mutual articulatory engagement.

Abstract: An artificial ligament (10) has a bundle of coextensive elongate elements (11) held at their opposite ends in a mutual one-to-one relationship with the relative disposition of the individual elements at one end of the bundle corresponding generally with that at the other end, each element otherwise extending between its ends substantially freely of other elements of the bundle. The elements are suitably held by individual threading through respective perforations of grill members (13) to pass into securement in associated tubes (14). Preferably the bundle has a sheath, wrapping, distinctively coloured element (11a) or other feature to indicate visually the relative rotational disposition of the bundle between its ends.

Abstract: A prosthetic femoral component (40) for the knee joint has a body (41,42) defined between elongate articulation and securement surfaces (43; 44,45), the articulation surface (43) being convexly spherically shaped and the securement surface having major and minor areas at opposite end portions, the major area (44) being essentially concavely spherically concentric with the articulation surface to form a shell body part (41), and the minor area (45) being essentially planar extending chordally of the articulation surface. A bone-penetrating pin (46) preferably extends radially from the major securement surface area in a direction parallel to the longitudinal direction of the neighbouring minor area. A related surgical tool (50) for shaping the femoral condyle has a rotary cutter (52) to provide a cut bone surface complementing the component major area, and a guide spigot (53) projecting adjustably coaxially within the cutter.

Abstract: A prosthetic patellar component is provided which has a fixation part adapted to be secured to the bone of the patella and an articulation part defining a surface for replacing the femoral facet of the natural patella, with these parts being mutually engageable in such a manner as to allow rotation between them about a medio-lateral axis relative to the surface which replaces the femoral facet.

Abstract: A prosthetic femoral component of tricompartmental form has tibial facet surfaces (21) of like spherical shape and a patellar facet groove (31) of circular arcuate longitudinal shape, the latter having a slightly larger radius of curvature than the former, by about 1.2:R, and with the center of curvature (34) of the latter being respectively off-set by about 0.4 R and 0.6 R superiorly and anteriorly relative to those (26) of the former as seen in a lateral aspect.