Prosthetic stem with strengthening rib

A prosthetic stem for implantation in a bone, the prosthetic stem having a substrate, the prosthetic stem comprising:

• a shaft;
• a neck connected to said shaft, said neck and said shaft forming an obtuse angle;
• a porous substance protruding outwardly from the substrate of the prosthetic stem;
• and
• a substantially nonporous protrusion protruding outwardly from the substrate of the prosthetic stem, said substantially nonporous protrusion substantially flush with said porous substance, said protrusion forming a generally helical pattern along the prosthetic stem, said protrusion having a distal and a proximal end, said distal end rotated ninety degrees from said proximal end.

A prosthetic hip stem for implantation in a femur, the prosthetic hip stem having a substrate, the prosthetic hip stem comprising:

• a shaft having a medial side;
• a neck connected to said shaft, said neck extending from said medial side of said hip stem, said neck and said shaft forming an obtuse angle;
• a porous substance protruding outwardly from the substrate of the prosthetic hip stem;
• a first substantially nonporous protrusion protruding outwardly from the substrate of the prosthetic hip stem, said first substantially nonporous protrusion substantially flush with said porous substance;
• and
• a transition section intermediate said neck and said shaft, said transition section defining a medial curve and a medial curve tangency, said first substantially nonporous protrusion having a length, said first substantially nonporous protrusion having a variable cross-section along said length, said substantially nonporous protrusion having a maximum transverse cross-section positioned adjacent said medial curve tangency.

A prosthetic hip stem for implantation in a femur, the prosthetic hip stem having a substrate, the prosthetic hip stem comprising:

• a shaft having a medial side;
• a neck connected to said shaft, said neck extending from said medial side of said hip stem, said neck and said shaft forming an obtuse angle;
• a porous substance protruding outwardly from the substrate of the prosthetic hip stem;
• and
• a first substantially nonporous protrusion protruding outwardly from the substrate of the prosthetic hip stem, said first substantially nonporous protrusion substantially flush with said porous substance, said first substantially nonporous protrusion having a length and a midpoint along said length, said first substantially nonporous protrusion having a variable transverse cross-section along said length, said variable transverse cross-section defining a maximum transverse cross-section at said midpoint.

A prosthetic stem for implantation in a bone, the prosthetic stem having a substrate, the prosthetic stem comprising:

• a shaft;
• a neck connected to said shaft, said neck and said shaft forming an obtuse angle;
• a porous substance protruding outwardly from the substrate of the prosthetic stem;
• a substantially nonporous protrusion protruding outwardly from the substrate of the prosthetic stem, said substantially nonporous protrusion substantially flush with said porous substance, said substantially nonporous protrusion having a length and a midpoint along said length, said substantially nonporous protrusion having a variable transverse cross-section along said length, said variable transverse cross-section defining a maximum transverse cross-section at said midpoint.

A prosthetic stem for implantation in a bone, the prosthetic stem having a substrate, the prosthetic stem comprising:

• a shaft;
• a neck connected to said shaft, said neck and said shaft forming an obtuse angle;
• a porous substance protruding outwardly from the substrate of the prosthetic stem;
• a substantially nonporous protrusion protruding outwardly from the substrate of the prosthetic stem, said substantially nonporous protrusion substantially flush with said porous substance;
• a transition section intermediate said neck and said shaft, said transition section defining a medial curve and a medial curve tangency, said substantially non porous protrusion having a length, said substantially nonporous protrusion having a variable cross-section along said length, said substantially nonporous protrusion defining a maximum transverse cross-section adjacent said medial curve tangency.