Interpositional Joint Implant
First Claim
Patent Images
1. An interpositional implant suitable for a knee joint, the implant comprising:
- a superior surface arranged to oppose at least a portion of a femur;
an inferior surface arranged to oppose at least a portion of a tibial surface; and
one or more protrusions extending outwardly from the inferior surface, the protrusion including a taper at the lowest surface of the protrusion in an anterior to posterior direction.
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Abstract
A method of preparing an interpositional implant suitable for a knee. The method includes determining a three-dimensional shape of a tibial surface of the knee. An implant is produced having a superior surface and an inferior surface, with the superior surface adapted to be positioned against a femoral condyle of the knee, and the inferior surface adapted to be positioned upon the tibial surface of the knee, The inferior surface conforms to the three-dimensional shape of the tibial surface. The implant may be inserted into the knee without making surgical cuts on the tibial surface. The tibial surface may include cartilage, or cartilage and bone.
513 Citations
108 Claims
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1. An interpositional implant suitable for a knee joint, the implant comprising:
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a superior surface arranged to oppose at least a portion of a femur;
an inferior surface arranged to oppose at least a portion of a tibial surface; and
one or more protrusions extending outwardly from the inferior surface, the protrusion including a taper at the lowest surface of the protrusion in an anterior to posterior direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An implant for insertion in a joint between a first articular surface and a second articular surface, the implant comprising:
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a first implant surface for engaging the first articular surface, the first implant surface substantially conforming to the first articular surface, the first articular surface including cartilage; and
a second implant surface for engaging the second articular surface, the second surface being substantially smooth in areas adapted to engage the second articular surface, permitting movement of the second articular surface. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An implant for insertion in a joint between a first articular surface and a second articular surface, the implant comprising:
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a first implant surface for engaging the first articular surface;
the first implant surface having one or more convexities and one or more concavities; and
a second implant surface for engaging the second articular surface, the second implant surface having at least one of a plurality of concavities and a plurality of convexities. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. An implant for insertion in a knee joint between a tibial articular surface and a femoral articular surface, the implant comprising:
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a first implant surface for engaging the tibial articular surface; and
a second implant surface for engaging the femoral articular surface, the second implant surface having a plurality of concavities. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. An implant for insertion in a knee joint between a tibial articular surface and a femoral articular surface, the implant comprising:
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a first implant surface for engaging the femoral articular surface; and
a second implant surface for engaging the tibial articular surface, the second implant surface having a plurality of convexities. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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56. An implant for insertion in a joint having a first articular surface, the implant comprising:
a first implant surface conforming to the first articular surface, the first articular surface including cartilage. - View Dependent Claims (57, 58, 59, 60, 61, 62, 63, 64, 65)
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66. An interpositional implant suitable for a knee joint, the implant comprising:
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a superior surface arranged to oppose at least a portion of a femur; and
an inferior surface arranged to oppose at least a portion of a tibial surface, wherein the implant has a substantially U-shaped cross-section in at least one of a medial-lateral direction and an anterior-posterior direction. - View Dependent Claims (67)
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68. An interpositional implant suitable for a knee joint, the implant comprising:
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a superior surface arranged to oppose at least a portion of a femur; and
an inferior surface arranged to oppose at least a portion of a tibial surface, wherein the implant has a substantially U-shaped cross-section in a medial-lateral direction. - View Dependent Claims (69)
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70. An interpositional implant suitable for a knee joint, the implant comprising:
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a superior surface arranged to oppose at least a portion of a femur; and
an inferior surface arranged to oppose at least a portion of a tibial surface, wherein the implant has a substantially inverted U-shaped cross-section in at least one of a medial-lateral direction and an anterior-posterior direction.
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71. An interpositional implant suitable for a knee joint, the implant comprising:
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a superior surface arranged to contact at least a portion of a femur;
an inferior surface arranged to contact at least a portion of a tibial surface, the superior surface and the inferior surface facing opposing directions and defining a thickness; and
a peripheral edge extending between the superior and inferior surfaces, the greatest thickness at the peripheral edge at least 2 mm more than the smallest thickness of the implant. - View Dependent Claims (72)
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73. An interpositional implant suitable for a knee joint, the implant comprising:
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a superior surface arranged to contact at least a portion of a femur; and
an inferior surface arranged to contact at least a portion of a tibial surface, the superior surface and the inferior surface facing opposing directions;
the superior surface having a height relative to the inferior surface at its lowest point; and
a peripheral edge extending between the superior and inferior surfaces, the greatest height at the peripheral edge greater than the smallest height within the implant by a ratio of 2;
1. - View Dependent Claims (74)
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75. An interpositional implant suitable for a knee joint, the implant comprising:
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a superior surface arranged to contact at least a portion of a femur;
an inferior surface arranged to contact at least a portion of a tibial surface; and
a peripheral edge extending between the superior and inferior surfaces, the peripheral edge having a varying center that defines a perimeter around the implant, wherein a lowest point of a central portion of the superior surface is lower than 30% of the perimeter. - View Dependent Claims (76)
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77. An implant for insertion in a joint between a first articular surface and a second articular surface, the implant comprising:
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a first implant surface conforming to the first articular surface, the first articular surface including cartilage, the first implant surface having a periphery, the periphery including a stabilization mechanism for limiting motion of the implant in the joint; and
a second implant surface for contacting the second articular surface. - View Dependent Claims (78, 79, 80, 81, 82, 83, 84, 85, 86, 87)
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88. A method of making an interpositional implant suitable for a knee, the method comprising:
producing an implant having a superior surface and an inferior surface, the superior surface adapted to be positioned against a femoral condyle of the knee, the inferior surface adapted to be positioned upon and conform to the tibial surface of the knee, the tibial surface including cartilage, wherein the inferior surface has a periphery, the periphery including a stabilization mechanism for restricting motion of the implant in the joint. - View Dependent Claims (89, 90, 91, 92, 93)
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94. An implant interposed in a joint between a first articular surface and a second articular surface, the implant comprising:
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a first surface for contacting the first articular surface such that motion of the implant is constrained; and
a second surface for contacting the second articular surface, the second surface allowing movement of the second articular surface. - View Dependent Claims (95, 96, 97, 98, 99, 100, 101, 102, 103, 104)
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105. A method of preparing an interpositional implant suitable for a knee, the method comprising:
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determining a three-dimensional shape of a tibial surface of the knee; and
producing an implant having a superior surface and an inferior surface, the superior surface adapted to be positioned against a femoral condyle of the knee, the inferior surface adapted to be positioned upon the tibial surface of the knee, the inferior surface conforming to the three-dimensional shape of the tibial surface. - View Dependent Claims (106, 107, 108)
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Specification