A prosthesis comprising a multi-piece stem assembly for fixation of the prosthesis, said multi-piece stem assembly comprising: a top prosthesis stem component including a first external hex feature disposed at a first internally threaded female end of the top prosthesis stem component; a middle prosthesis stem component including a first internal hex feature and a second external hex feature at a second internally threaded female end of the middle prosthesis stem component, the second internally threaded female end disposed opposite of a first externally threaded male end of the middle prosthesis stem component; and a bottom prosthesis stem component including a second internal hex feature at an end that is disposed opposite of a second externally threaded male end of the bottom prosthesis stem component, wherein the first externally threaded male end forms a first attachment site and has an outer diameter that is smaller than an outer diameter of the middle prosthesis stem component, the first attachment site is configured to mate with the first internally threaded female end that forms a second attachment site to couple the top prosthesis stem component to the middle prosthesis stem component in situ, wherein the second externally threaded male end forms a third attachment site and has an outer diameter that is smaller than an outer diameter of the bottom prosthesis stem component, the third attachment site is configured to mate with the second internally threaded female end that forms a fourth attachment site to couple the middle prosthesis stem component to the bottom prosthesis stem component in situ, and wherein each of the top, middle, and bottom prosthesis stem components is sized and configured for insertion through a surgical opening that is smaller than the multi-piece stem assembly. a top prosthesis stem component including a first external hex feature disposed at a first internally threaded female end of the top prosthesis stem component; a middle prosthesis stem component including a first internal hex feature and a second external hex feature at a second internally threaded female end of the middle prosthesis stem component, the second internally threaded female end disposed opposite of a first externally threaded male end of the middle prosthesis stem component; and a bottom prosthesis stem component including a second internal hex feature at an end that is disposed opposite of a second externally threaded male end of the bottom prosthesis stem component, wherein the first externally threaded male end forms a first attachment site and has an outer diameter that is smaller than an outer diameter of the middle prosthesis stem component, the first attachment site is configured to mate with the first internally threaded female end that forms a second attachment site to couple the top prosthesis stem component to the middle prosthesis stem component in situ, wherein the second externally threaded male end forms a third attachment site and has an outer diameter that is smaller than an outer diameter of the bottom prosthesis stem component, the third attachment site is configured to mate with the second internally threaded female end that forms a fourth attachment site to couple the middle prosthesis stem component to the bottom prosthesis stem component in situ, and wherein each of the top, middle, and bottom prosthesis stem components is sized and configured for insertion through a surgical opening that is smaller than the multi-piece stem assembly.