An expandable intervertebral fusion cage is independently expandable vertically and laterally. The fusion cage includes a cage body that can receive an expansion member that causes the fusion cage to expand vertically. The cage body is responsive to a compressive force to move to an expanded lateral position, whereby the fusion cage defines a substantially circular annular profile.

According to one example, a tibial prosthesis that optionally includes a baseplate and a tibial keel. The baseplate optionally including: a distal surface sized and shaped to substantially cover a proximal resected surface of a tibia; a proximal surface opposite the distal surface, the proximal surface having a lateral compartment and a medial compartment opposite the lateral compartment; a periphery extending between the distal surface and the proximal surface; a first pocket formed in the baseplate and recessed from the distal surface, wherein the first pocket is configured to receive a bone cement therein; a second pocket formed in the baseplate and recessed from the first pocket, wherein the second pocket is configured to receive a portion of the bone cement. The tibial keel extending distally from the distal surface to define a longitudinal tibial keel axis.

An expandable intervertebral fusion cage is independently expandable vertically and laterally. The fusion cage includes a cage body that can receive an expansion member that causes the fusion cage to expand vertically. The cage body is responsive to a compressive force to move to an expanded lateral position, whereby the fusion cage defines a substantially circular annular profile.