Abstract An acetabular cup prosthesis which has facilities for ready removal. In one form it has grooves to guide a surgical saw on the inside, preferably to cut the prosthesis in quadrants for removal, and also having threaded sockets to insert a tool to remove the quadrants. Additionally or alternatively, it has protrusions from its rear not adapted to offer much resistance in case of removal. In the preferred form two blades protrude from the rear and are offset, so that they come to a point and also form a knife edge at the side. Outrigger blades are provided extending perpendicular to the diameter and terminating at a less height than the radius. In the preferred form the rear of the prosthesis has a porous coating and also the blades have a porous coating. In alternate forms, spikes extend from the rear of the prosthesis offset and in parallel relation, either from one side in a cluster or from one side distributed over that side. In another form there is a screw which extends from the rear end offset to the axis of symmetry. In another form there are blades which lie along the rear, for example parallel to one another and parallel to the diameter or at right angles to the diameter.
An acetabular cup prosthesis including a cup shaped insertion and a guide groove across the inside of the insertion at substantially diametrical distance for a surgical saw by which it can be cut up for removal.
Claim 2
Dependent Claim
36 words
An acetabular cup prosthesis including a cup shaped insertion and a guide groove across the inside of the insertion at substantially diametrical distance for a surgical saw by which it can be cut up for removal.
Claim 3
Dependent Claim
24 words
An acetabular cup prosthesis of claim 1, having guide grooves at the inside surface which are of substantially diametrical length and of cruxiform formation.
Claim 4
Dependent Claim
32 words
An acetabular cup prosthesis of claim 2, having in each quadrant of the cup a threaded opening for receiving a threaded extraction tool, the openings being near the center of the cup.
Claim 5
Dependent Claim
36 words
An acetabular cup prosthesis of claim 2, having converging blades from the back of the cup diminishing in size away from the cup and the blades having a common edge and making a V in cross-section.