Kit with femoral prostheses having insertion/extraction features

A kit comprising a plurality of femoral prostheses of different sizes and shapes, each femoral prosthesis comprising:

• a femoral stem including a proximal end portion defining a proximal stem axis;
• a femoral neck portion located proximally of the proximal end portion, the femoral neck portion including a lateral shoulder extending distally and laterally from a proximal location of the neck at an angle relative to the proximal stem axis, such that when projected onto a coronal plane including the proximal stem axis, the lateral shoulder is not parallel to the proximal stem axis;
• and
• an insertion/extraction cavity extending distally from a proximal surface of the femoral neck portion and configured to couple with an insertion/extraction instrument, the cavity defining an insertion/extraction cavity axis which, when projected on to the coronal plane including the proximal stem axis, is not parallel with the proximal stem axis, wherein the lateral shoulder of each femoral prosthesis in the kit is oriented at an angle relative to the proximal stem axis that is different from the angle of each of the other femoral prostheses in the kit.