Prosthetic patella

摘要

A system of prosthetic patellar components including first and second prosthetic patellar components having dissimilar perimeter shapes and which are interchangeably usable without altering the securement feature formed on the natural patella or the position of the apex of the articulating surface of the prosthetic patella is described. A keyed securement feature as well as a patellar implant having a single offset mounting post for facilitating the proper placement of a patellar prosthesis on a natural patella based on patella tracking are also described.

主权项

1. A system of patellar prostheses, comprising:
a first patellar prosthesis comprising:
a first patellar prosthesis perimeter defining a first patellar prosthesis perimeter shape; anda first patellar prosthesis securement feature having a size and a shape; a second patellar prosthesis comprising:
a second patellar prosthesis perimeter defining a second patellar prosthesis perimeter shape, said second patellar prosthesis perimeter shape dissimilar from said first patellar prosthesis perimeter shape; anda second patellar prosthesis securement feature having said size and said shape, whereby said first patellar prosthesis and said second patellar prosthesis are securable to a natural patella having a patella securement feature compatible with said size and said shape shared by said first patellar prosthesis securement feature and said second patellar prosthesis securement feature to allow interchangeable securement of said first patellar prosthesis and said second patellar prosthesis to a natural patella, wherein the second patellar prosthesis securement feature includes a plurality of second prosthesis patellar fixation posts and the plurality of second prosthesis patellar fixation posts, as a group, are offset from a centroid of the second patellar prosthesis perimeter.