Kabushiki Kaisha B.i. Tec

Sunichi Bandoh

Nobuhiko Sugano

Masaru Zako

An artificial cement-less hip prosthesis stem comprises an inner constructwhich reacts with a load acting on a hip joint and an outer constructfor transmitting the load acting on the inner construct to a femur. The inner construct has an inner bodyB which reacts with the load transmitted from a neckA. The outer construct has both an outer bodyA which is bell mouth-shaped toward an epiphysis so as to surround the inner bodyB and a legB extending toward a medullary cavity. The torsional rigidity given to the proximal end and the distal end of the outer bodyA and the legB is regulated so as to be lower than the torsional rigidity given to an intermediate portionof the outer bodyA.

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Kakamigahara, Japan

Sunichi Bandoh