Abstract: A hip prosthesis is disclosed which employs a number of cement spacers located on the surface of the stem of the prosthesis immediately below a collar which makes direct and parallel contact with calcar bone when a stem of the prosthesis is seated in medullary canal of the patient. The collar is constructed to provide even stress distribution to the bone.

Abstract: A roll caster feed tip comprising a top member, a bottom member, a pair of fixed side members positioned between the top and bottom members to define a molten metal passageway having at least one inlet and an outlet adjacent the roll caster, said outlet having an adjustable width, and means between the side members for adjusting the width of the outlet during casting. The adjustment means preferably comprises at least one spacer adapted to slidably extend through the inlet and to the outlet of the passageway, said spacer extending adjacent one side member. More preferably, the adjustment means comprises a plurality of spacers adapted to slidably extend through the inlet and to the outlet of the passageway, said spacers extending either adjacent the side members and each other or through channels defined by a plurality of guides extending between the top and bottom members intermediate the side members.