Osteolysis-resistant cementless joint implant with improved stability and seating function

An osteolysis-resistant, mechanically stable, prosthetic implant for apposition on a resected surface of a bone, the implant comprising:

• a baseplate having a substantially planar lower apposition surface and an upwardly rising perimeter edge which forms a tray-like depression for receiving a tibio-femoral insert;
• one or more elongate conical anchors protruding inferiorly from the apposition surface, each conical anchor defining a hollow interior through-passage for receiving, mating with, and forming a Morse friction fit with, a tapered screw head received via the through-cavity;
• two or more primary socket head shoulder screws comprising a tapered head and threaded shaft adapted to form a Morse friction fit;
• and
• two or more secondary socket head screws comprising a sharpened conical tip and a threaded cylindrical shaft;
• wherein the secondary socket head screws are placed into the implant prior to surgical impaction of the implant to form pilot holes and replaced with the primary socket head shoulder screws after surgical impaction of the implant, the primary socket head shoulder screws forming a Morse taper with the through-cavity adapted to seal the through-passage to prevent osteolysis.