| 摘要 |
An assembly including a head and movable neck for preparing the implantation of an artificial hip is described, the head and the movable neck having, respectively, a frustoconical hole and a frustoconical portion insertable therein. The flat end of the frustoconical portion has, coaxially formed or mounted thereon, a cylindrical protrusion having a diameter smaller than that of the frustoconical portion opposite its fiat end and the frustoconical hole has a coaxial, blind, cylindrical extension from the side walls of which an annular protrusion having an internal diameter which produces a slight interference with the diameter of the cylindrical protrusion projects, and the height of the cylindrical extension is greater than or equal to that of the cylindrical protrusion so that, when the latter is inserted over its entire height inside the cylindrical extension, the flat end bears against a concentric shoulder formed on the head around the cylindrical extension.
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