Prosthetic components with secondary retention

An orthopaedic prosthesis assembly, comprising:

• a first prosthetic component configured to be implanted into a bone of a patient, the prosthetic component including (i) a surface configured to contact the bone and (ii) a stem post extending away from the surface along an axis, the stem post having a tapered bore, a first passageway, and a threaded second passageway connecting the tapered bore and the first passageway,
• a second prosthetic component including a tapered post received in the tapered bore of the first prosthetic component, the tapered post having (i) a bore formed therein extending along the axis and (ii) a threaded aperture defined at an end of the bore, and
• a fastener comprising (i) a head received in the first passageway and (ii) an elongated body extending through the threaded second passageway along the axis and having an end positioned in the threaded aperture, and
• a retention device received in the stem post to prevent the end of the fastener from entering the first passageway.

A method for assembling an implantable orthopaedic knee prosthesis assembly, the method comprising:

• inserting a post of a stem component into a bore defined in a femoral component to secure the stem component to the femoral component,
• advancing an end of a fastener through a threaded passageway defined in the femoral component and into the post of the stem component,
• threading the end of the fastener into a threaded aperture defined in the stem component, and
• engaging a retention device with the femoral component to prevent the end of the fastener from reentering the threaded passageway after advancing the end of the fastener through the threaded passageway and into the post of the stem component.