Conical Patellar Implant Fixation With Minimal Bone Resection

The patent applies a conical (curved) geometry to the bone interfacing surface of the patellar implant, replacing the conventional planar flat surface. This conical shape allows the implant to be pressed into a corresponding conical recess in the patella, creating tapered mechanical interlocking that significantly enhances fixation strength and prevents detachment, while still being manufacturable using standard techniques.

The patent inverts the conventional onlay approach by placing the conical fixation feature on the implant itself rather than creating posts in the bone. The implant contains a conical recess that receives the patellar bone, creating an inlay-style fixation without requiring extensive bone removal or separate fixation posts, thus preserving patellar strength while maintaining secure fixation.

The patent employs a conical (curved) geometry for the bone interfacing surface, creating a tapered shape that enables deep embedding of the implant into the patella. This conical design allows the implant to be securely pressed into a matching conical recess, achieving superior fixation depth and security while minimizing bone removal compared to conventional planar inlay techniques.

The patent implements varying thickness in the implant body, with greater thickness in regions corresponding to high mechanical stress areas and reduced thickness where bone preservation is prioritized. This non-uniform thickness distribution optimizes stress management and structural performance while the overall conical geometry maintains manufacturability through standard forming processes.