Recessed patellar prosthesis
First Claim
Patent Images
1. A one-piece patellar prosthesis adapted to be implanted in a prepared patella with bone cement comprising:
- (a) a dome having an outwardly facing surface, convexly curved throughout, positioned for sliding engagement with a femoral prosthesis, said dome terminating at its radial outer extent in a circular edge defining a plane, said dome having a central axis perpendicular to said plane;
(b) a body having a surface facing away from said outwardly facing surface, said body extending to said circular edge and said body surface having (i) a first central area in proximity to said central axis spaced from said plane by a predetermined amount, (ii) other areas extending radially outwardly from said central axis tapering without interruption toward said plane and (iii) at least one concavity positioned between said other areas, said concavity having reverse taper surfaces for engagement with said bone cement; and
(c) post means extending from said body surface along said central axis.
0 Assignments
0 Petitions
Accused Products
Abstract
A patellar prosthesis has a dome and a body having a central post and an outwardly facing surface tapering toward said dome in a direction extending away from said central post. A plurality of cavities are formed in said body outwardly facing surface. The cavities include an undercut wall for retention of bone cement upon implantation in a prepared patella.
237 Citations
20 Claims
-
1. A one-piece patellar prosthesis adapted to be implanted in a prepared patella with bone cement comprising:
-
(a) a dome having an outwardly facing surface, convexly curved throughout, positioned for sliding engagement with a femoral prosthesis, said dome terminating at its radial outer extent in a circular edge defining a plane, said dome having a central axis perpendicular to said plane; (b) a body having a surface facing away from said outwardly facing surface, said body extending to said circular edge and said body surface having (i) a first central area in proximity to said central axis spaced from said plane by a predetermined amount, (ii) other areas extending radially outwardly from said central axis tapering without interruption toward said plane and (iii) at least one concavity positioned between said other areas, said concavity having reverse taper surfaces for engagement with said bone cement; and (c) post means extending from said body surface along said central axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A one-piece patellar prosthesis adapted to be implanted in a prepared patella with bone cement comprising:
-
(a) a dome having an outwardly facing surface, convexly curved throughout, positioned for sliding engagement with a femoral prosthesis, said dome terminating at its radial outer extent in a circular edge defining a plane, said dome having a central axis perpendicular to said plane; (b) a body having a surface facing away from said outwardly facing surface, said body extending to said circular edge and said body surface having a first central area in proximity to said central axis spaced from said plane by a predetermined amount and other areas extending radially outwardly from said central axis, said other areas having at least one concavity with a reverse taper surface for positive engagement with said bone cement, said body surface tapering toward said plane; and (c) a central post extending from said body surface along said central axis. - View Dependent Claims (10, 11, 12, 13)
-
-
14. A patellar prosthesis comprising:
-
(a) a central post extending along a longitudinal axis and (b) a body portion extending from said central post, said body portion having, (i) a first side extending outwardly from said longitudinal axis and tapering away from said central post to an outer peripheral edge, said first side having a plurality of concavities having reverse taper surfaces; and (ii) a second side having a domed surface, convexly curved throughout, with an apex lying on said longitudinal axis, said apex being spaced axially from said central post further than any other portion of said domed surface. - View Dependent Claims (15, 16, 17, 18, 19, 20)
-
Specification