Knee arthroplasty prosthesis
First Claim
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1. A modular tibial component comprising:
- a tibial base comprising;
an inferior surface adapted to engage a prepared surface at a proximal end of a tibia;
a superior surface opposite said inferior surface;
a base extension having a cylindrical shape and extending distally from said inferior surface, said base extension including a first engagement surface and a cavity defined by the first engagement surface, said base extension defining a longitudinal extension axis; and
a plurality of base fixation fins extending outwardly from said base extension; and
a tibial stem comprising a distal end and an opposed proximal end, an elongate outer surface extending from said distal end to said proximal end, said tibial stem defining a longitudinal stem axis, said tibial stem comprising;
a second engagement surface complementary to said first engagement surface of said base extension, said second engagement surface proximate said proximal end of said tibial stem such that said first and second engagement surfaces lockingly engage by advancement of said tibial stem toward said inferior surface of said tibial base along an inferior-to-superior direction such that said second engagement surface is received within said cavity of said base extension;
a groove formed in said outer surface and distally spaced from said proximal end, said groove extending transverse to said stem axis, said groove comprising groove portions on opposite sides of said outer surface; and
a plurality of stem extension fins extending outwardly from said outer surface of said tibial stem, said stem fixation fins aligned with and forming extensions of said base fixation fins when said first and second engagement surfaces are lockingly engaged, wherein said tibial base further comprises a passageway extending through said tibial base from said superior surface to said inferior surface, said passageway passing through said base extension such that said stem axis is aligned with said extension axis when said first and second engagement surfaces are lockingly engaged.
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Abstract
A knee arthroplasty prosthesis includes a femoral component having multiple pieces with engagement means provided for engaging various pieces of the femoral component to one another following their insertion in the incised area of the femur. A tibial component includes multiple pieces designed for assembly following positioning in the incision. The tibial component includes a Morse taper cavity on one piece of the tibial component and a Morse taper extension on another member of the component for receipt therein.
176 Citations
17 Claims
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1. A modular tibial component comprising:
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a tibial base comprising; an inferior surface adapted to engage a prepared surface at a proximal end of a tibia; a superior surface opposite said inferior surface; a base extension having a cylindrical shape and extending distally from said inferior surface, said base extension including a first engagement surface and a cavity defined by the first engagement surface, said base extension defining a longitudinal extension axis; and a plurality of base fixation fins extending outwardly from said base extension; and a tibial stem comprising a distal end and an opposed proximal end, an elongate outer surface extending from said distal end to said proximal end, said tibial stem defining a longitudinal stem axis, said tibial stem comprising; a second engagement surface complementary to said first engagement surface of said base extension, said second engagement surface proximate said proximal end of said tibial stem such that said first and second engagement surfaces lockingly engage by advancement of said tibial stem toward said inferior surface of said tibial base along an inferior-to-superior direction such that said second engagement surface is received within said cavity of said base extension; a groove formed in said outer surface and distally spaced from said proximal end, said groove extending transverse to said stem axis, said groove comprising groove portions on opposite sides of said outer surface; and a plurality of stem extension fins extending outwardly from said outer surface of said tibial stem, said stem fixation fins aligned with and forming extensions of said base fixation fins when said first and second engagement surfaces are lockingly engaged, wherein said tibial base further comprises a passageway extending through said tibial base from said superior surface to said inferior surface, said passageway passing through said base extension such that said stem axis is aligned with said extension axis when said first and second engagement surfaces are lockingly engaged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A tibial prosthesis kit comprising:
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a tibial base comprising; an inferior surface adapted to engage a prepared surface at a proximal end of a tibia; a superior surface opposite said inferior surface; and a base extension having a cylindrical shape and extending distally from said inferior surface, said base extension including a first engagement surface and a cavity defined by the first engagement surface; a tibial stem comprising a distal end and an opposed proximal end, an elongate outer surface extending from said distal end to said proximal end, said tibial stem defining a longitudinal stem axis, said tibial stem comprising; a second engagement surface complementary to said first engagement surface of said base extension, said second engagement surface proximate said proximal end of said tibial stem such that said first and second engagement surfaces lockingly engage by advancement of said tibial stem toward said tibial base along an inferior-to-superior direction such that said second engagement surface is received within said cavity of said base extension; a cavity formed in said distal end; a plug engageable with said cavity of said tibial stem to prevent blood from entering said cavity; a stem extension lockingly engageable within said cavity of said distal end of said tibial stem, such that said stem extension extends distally from said distal end to effectively lengthen said tibial stem, whereby said plug and said stem extension are selectively attachable to said tibial stem. - View Dependent Claims (17)
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Specification