An implantable knee prosthesis for unicompartmental implantation into a knee
joint
includes a body having a substantially elliptical shape in plan and a pair of opposed
faces. A peripheral edge extends between the faces and has first and second opposed
sides and first and second opposed ends. At least one keel member extends from
one of the faces. A first dimension D is defined by the first and second ends.
A second dimension F is defined by the first and second sides. The dimension F
is from about 0.25 to about 1.5 of the dimension D.