Patent ID: 8157871

Claim:
A prosthesis adapted for implantation against a resected surface on a proximal end of a femur and inside of an intramedullary cavity of the femur, the prosthesis comprising: a femoral head component comprising an external bearing surface; a femoral stem component comprising: a neck portion comprising a proximal portion re-engageable with the femoral head component, and a distal neck body; a flange portion distal and adjacent to the neck portion, the flange portion having a planar bottom surface with a maximum anterior-posterior width which protrudes anteriorly and posteriorly beyond the neck portion, the flange portion shaped to cover at least a portion of resected cortical bone; a transitional body region adjacent to the bottom surface of the flange portion and extending from the distal neck body; and an elongated stem portion extending distally from the transitional body region, and wherein the elongated stem portion is at least partially encompassed within a uniform envelope; wherein the transitional body region is shaped to flex such that, during a normal gait cycle, the flange portion exerts a significant compressive load on the resected surface of the femur.