Total hip prosthesis

Details Total hip prosthesis Total hip prosthesis

A - Human Necessities

61

F

A61F 2/32 (2006.01)

Patent

CA 2563842

A total hip prosthesis comprising a cup having a part-spherical inner bearing surface and a spherical centre through which the plane of a diametrical equator extends, and a ball shaped head which has a diameter to co-operate with said inner bearing surface to allow free movement therein, and having a flat cordal lower surface parallel to the plane of an equator of the ball; and in which said inner bearing surface has two or more equally spaced extension portions which extend beyond the diametrical equator towards the mouth of the cup, and two or more portions below the diametrical equator and between the said extension portions the surfaces of which are relieved to enable the ball shaped head to be inserted into the cup by moving the flat on the ball across the face of one of the bearing surface extension portions and then rotating ball head to a position in which the flat on the ball head faces the mouth of the cup and the ball head is held in the cup by the extension portions which extend beyond the said diametrical equator.

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