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1. A tibial component of a knee joint prosthesis, the tibial component comprising:
a body portion; an upper surface; a first concave fossae comprising a first condyle contact surface; a second concave fossae comprising a second condyle contact surface; a lower outer surface; a side portion extending between the upper surface and the lower outer surface; a first bearing portion; a second bearing portion; and a first cavity extending into the body portion from the lower outer surface and a second cavity extending into the body portion from the lower outer surface,
wherein the first cavity is positioned substantially opposite the first condyle contact surface and the second cavity is positioned substantially opposite the second condyle contact surface; wherein a load applied substantially normally to the first condyle contact surface and the second condyle contact surface causes a tensile stress within the first bearing portion and the second bearing portion, and a compressive stress within the side portion.
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