Abstract: An anchoring rod includes a proximal zone and an axial anchoring zone having a plurality of sides arranged in a generally square cross-section and joining at least two pairs of cutting fins. Each pair of cutting fins includes two fins spaced by a recess having opposed sides. Each fin formed by a dihedron provided by the intersection of the adjacent sides of the anchoring zone and recess. The two most remote sides of the dihedra of the pair of fins form an angle of from 60.degree. to 120.degree.. This angular relationship is applicable to the extents of the remote sides extending a distance only in the order of one millimeter from the adjacent fin, the length being measured from each fin along the surfaces of the respective sides.

Abstract: This inverse reamer is formed of a tang extended by a helical shank. The edge turned towards the point is cutting and is wound in a direction contrary to the direction of rotation normally provided for operating the reamer.

Abstract: This articular prosthesis comprises a proximal part (P) and a distal part (D) having a form such that one of these is female and the other male when they are assembled along an impaction axis by their opposite mating faces, each opposite face comprising several stepped sections, each section being in the form of a truncated cone, wherein the thickness (E, e) of consecutive sections of one of the parts increases, while the thickness of the mating consecutive sections of the other part decreases.