Modular knee implants
OwnerAndrew Arthur Amis, Robert Michael Wozencroft +1inventors
InventorsAndrew Arthur Amis, Robert Michael Wozencroft, Justin Peter Cobb
Life of this patent
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Abstract
An implant for bone re-surfacing in a joint, the implant having a bearing platform having a front surface which forms a bearing surface and a back surface, and securing apparatus projecting from the back surface, the securing apparatus having a locking surface arranged to bear against an undercut surface of the bone to secure the implant against the bone.
Claims55
An implant for bone re-surfacing in a joint, the implant comprising:
- a bearing platform having a front surface which forms a bearing surface and a back surface;
- and
- securing means projecting from the back surface, the securing means having a locking surface arranged to bear against an undercut surface of the bone to secure the implant against the bone.
A uni-condylar implant set comprising:
- a tibial implant comprising a bearing platform having a front surface which forms a bearing surface and a back surface, and securing means projecting from the back surface, the securing means having a locking surface arranged to bear against an undercut surface of the bone to secure the implant against the bone;
- and
- a femoral implant.
A knee resurfacing implant set comprising:
- two uni-condylar implant sets each of which is a uni-condylar implant set comprising a tibial implant comprising a bearing platform having a front surface which forms a bearing surface and a back surface, and securing means projecting from the back surface, the securing means having a locking surface arranged to bear against an undercut surface of the bone to secure the implant against the bone and a femoral implant.
A method of resurfacing a bone comprising:
- cutting an undercut groove in the bone;
- providing an implant comprising a bearing portion with a back surface and securing means projecting from the back surface, the securing means having a locking surface arranged to bear against an undercut surface of the groove;
- and
- inserting the securing means into the groove to secure the implant against the bone.
A unicondylar implant set comprising:
- a tibial implant;
- a femoral implant;
- and
- a meniscal component arranged to be located between the tibial and femoral components and having upper and lower bearing surfaces arranged to contact the femoral and tibial components respectively, wherein the lower bearing surface of the meniscal component is convex in both a coronal plane and a sagittal plane.
A unicondylar implant set comprising:
- a tibial implant;
- a femoral implant;
- and
- a meniscal component arranged to be located between the tibial and femoral components and having upper and lower bearing surfaces arranged to contact the femoral and tibial components respectively, wherein the lower bearing surface of the meniscal component is convex in the coronal plane and concave in the sagittal plane.
A knee resurfacing implant set comprising:
- a patella component for mounting on a patella;
- and
- a trochlear component for mounting on the femur and having a bearing surface arranged to contact the patella component wherein the bearing surface of the trochlear component comprises one convex part-spherical portion on its lateral side and a concave portion on its medial side.
A method of partially resurfacing a bone comprising:
- providing an implant;
- cutting a recess in the bone having a shape corresponding to that of the implant;
- and
- inserting the implant into the recess.
Dependencies are inferred from the claim text.