Tibial component for unicompartmental knee prosthesis for a cementness implantation
First Claim
1. A tibial component for a unicompartmental knee prosthesis adapted for cementless implantation, said tibial component comprising a metal base member having an overall configuration comprising a segment of a circular disc including a part cylindrical peripheral portion and a chordal portion,said base member having generally flat upper and lower faces and a generally flat lateral face coinciding with the chordal portion and perpendicular to the upper and lower faces, the lower face being adapted to bear against a notch surface in the plate of the tibia generally perpendicular to the longitudinal direction of the tibia and the lateral face being adapted to bear against a notch surface extending parallel to the longitudinal direction of the tibia along the intercondylar eminence,a plate member of polymer material having an upper and lower face for forming a lining for supporting a corresponding condylar component,means on said base member for fixing said plate member thereto,at least one projection from said lateral face adapted to be driven under the intercondylar eminence,said base member having at least one passage adjacent to be driven under the intercondylar eminence,said base member having at least one passage adjacent its part cylindrical peripheral portion, pinning means being adapted to be received in said passage and to penetrate into subjacent bone,at least part of the surface of said base member which is adapted to be brought into contact with bone of the tibia having a porous metal covering adapted to be invaded by spongy bone ingrowth.
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Accused Products
Abstract
A tibial component for a unicompartmental knee prosthesis intended to be fitted without cement, comprises a metal base portion in the general form of a segment of a circular disc with generally flat upper, lower and lateral faces, the latter which is perpendicular to the others extending along the chord of the segment, and a periphery in the form of an arc of a cylinder, the lower and lateral faces being provided to bear against two notch surfaces provided in the plate of the tibia, respectively perpendicular to the general direction of the tibia and parallel thereto along the intercondylar eminence, and a plate member of polymer material which is fixed to the upper face of the base portion and forming a lining for the support of a corresponding condylar component, the base portion having on its lateral face at least one projection arranged to be driven in under the intercondylar eminence, at least one passage for a pinning means to engage into the subjacent bone in the vicinity of its periphery, and on its upper face fixing means for fixing the plate member, which can be used after the base portion has been set in position, and at least a part of the surface of the base portion which is brought into contact with the bone being lined with a covering of porous metal capable of being invaded by the growing spongy bone.
123 Citations
27 Claims
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1. A tibial component for a unicompartmental knee prosthesis adapted for cementless implantation, said tibial component comprising a metal base member having an overall configuration comprising a segment of a circular disc including a part cylindrical peripheral portion and a chordal portion,
said base member having generally flat upper and lower faces and a generally flat lateral face coinciding with the chordal portion and perpendicular to the upper and lower faces, the lower face being adapted to bear against a notch surface in the plate of the tibia generally perpendicular to the longitudinal direction of the tibia and the lateral face being adapted to bear against a notch surface extending parallel to the longitudinal direction of the tibia along the intercondylar eminence, a plate member of polymer material having an upper and lower face for forming a lining for supporting a corresponding condylar component, means on said base member for fixing said plate member thereto, at least one projection from said lateral face adapted to be driven under the intercondylar eminence, said base member having at least one passage adjacent to be driven under the intercondylar eminence, said base member having at least one passage adjacent its part cylindrical peripheral portion, pinning means being adapted to be received in said passage and to penetrate into subjacent bone, at least part of the surface of said base member which is adapted to be brought into contact with bone of the tibia having a porous metal covering adapted to be invaded by spongy bone ingrowth.
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22. A tibial component for a unicompartmental knee prosthesis adapted for cementless implantation, said tibial component comprising a metal base member having an overall configuration comprising a segment of a circular disc including a part cylindrical peripheral portion and a chordal portion,
said base member having generally flat upper and lower faces and a generally flat lateral face coinciding with chordal portion and perpendicular to the upper and lower faces, the lower face being adapted to bear against a notch surface in the plate of the tibia generally perpendicular to the longitudinal direction of the tibia and the lateral face being adapted to bear against a notch surface extending parallel to the longitudinal direction of the tibia along the intercondylar eminence, a plate member of polymer material having an upper and lower face for forming a lining for supporting the condylar component, said base member having a rim projecting upwardly from its upper face along the cylindrical peripheral portion and lateral portion of said base member, the lower face of said plate member being adapted to be received inside of said rim and retained in place thereby, means on said base member for fixing said plate member thereto, a plate portion projecting from said lateral face adapted to be driven under the intercondylar eminence, said plate portion having an upper and lower face and being generally parallel to the upper and lower faces of said base member and having at least one orifice therethrough for bone ingrowth through said plate portion, said base member having at least one passage adjacent its part cylindrical peripheral portion, pinning means being adapted to be received in said passage and to penetrate into subjacent bone, the surface of said base member which is adapted to be brought into contact with bone of the tibia and the surface of said plate portion having a porous metal covering adapted to be invaded by spongy bone ingrowth.
Specification