A prosthetic device (50, 60) for a knee jointincludes a body portion (56) and a first keel (52, 62). Thebody portion attaches to a bone of a knee joint. The bodyportion can have a bearing surface (58) configured to replaceat least a portion of the bone and an implantation surfaceconfigured to face the bone upon implantation. Thefirst keel (52, 62) can be configured to be inserted into acorresponding first keel void formed in the bone. The firstfeel can be configured to project outwardly from the implantationsurface by an amount sufficient to inhibit movementof the body portion relative to the bone in both medicaland lateral directions (M-L) upon insertion into the firstkeel void. The first keel can extend along a longitudinal direction(L) of the body portion and is offset from a longitudinalcenterline (C) of the body portion. Methods of implantingand removing the prosthetic device are also provided.
