Patent ID: 7780737

Claim:
A system which is used to replace bone joints of substantially spherical geometry and which is made of biocompatible materials, comprising: three articular components; and a triple joint with sliding contact surfaces for displacements, the three articular components including: a bone-anchoring shell that is made of a rigid biocompatible material and that has a concave inner face, on the inner face, the shell having a smooth and substantially hemispherical articular surface, which is polished and has no bumps, cavities or reliefs that could cause wear of a mobile cup or could impede its free clearance when the latter is stressed in rotary displacement by a neck of a prosthesis; and a prosthesis that includes, at a part remote from a diaphyseal anchoring part, a polished ball and a flared neck, which is smooth, without bumps or notches; and a mobile articular cup that slides, in the smooth inner face of the bone-anchoring shell, and on the ball and the neck of the prosthesis, said mobile cup having an opening that narrows toward a center of said mobile articular cup, and having a flared part that is designed to adapt perfectly to the neck of the prosthesis, in all the respective positions of the mobile components, the triple joint including a first joint that is situated between an outer face of the mobile articular cup and between the inner face of the bone-anchoring shell, and the inner face having an opening disposed at a distance of between 1 and 6 mm from an equator of the bone-anchoring shell toward the prosthesis, the opening being structured to form a guide skirt having a cylindrical part, the inner face having a rounded edge, the opening including the guide skirt having a radius of between 1 and 5 mm, the radius of the opening corresponding to a radius of the equator, the inner face being structured to avoid any abrasion of the mobile cup during its introduction into the bone-anchoring shell during surgery.