Hip prosthesis with flared porous bony ingrowth pads

In a method for cementless insertion of a femoral insert hip joint prostheses in a surgically prepared opening in the femoral canal whereby long term stabilization of the insert is obtained by providing a porous bony ingrowth surface on at least one region of the stem of the femoral insert, the improvement comprising:

• providing said stem with substantially flat anterior and posterior sides, each said side having a hollow depression therein,
• providing the insert with a porous bony ingrowth member in the anterior side and posterior side hollow depressions, each of said porous ingrowth members gradually increasing in thickness and protruding increasingly further out of its respective hollow depression in the proximal direction in at least that region of the proximal portion of the stem which corresponds to the metaphyseal portion of the bone, whereby said increasingly thick porous ingrowth members on said anterior and posterior sides provide a wedge shaped cross-section;
• and
• fitting the femoral insert into the surgically prepared opening in the femoral canal whereby the wedge-shaped porous ingrowth members are force fitted into the femoral canal to provide for initial stabilization of said femoral insert.