Patent ID: 7753961

Claim:
A thighbone shaft comprising: a) a pole having: i) an inclined threaded hole extending through an outer periphery thereof; and ii) a plurality of steps located on opposing sides of the outer periphery thereof, each of the plurality of steps is offset relative to an adjacent step forming a continuous stepped surface; b) a head having: i) a projection having a first end connected to an end of the pole; and ii) a sleeve located on a second end of the projection; c) a bolt inserted into the inclined threaded hole and having a threaded portion threadedly connected to the inclined threaded hole; and d) a fixing element having a shoulder, the pole has a through hole extending axially through a length thereof, the through hole of the pole has a step, the projection of the head has a positioning hole located on the first end and the first end is inserted into the through hole, the fixing element is inserted into the through hole and connected to the positioning hole, and the shoulder of the fixing element engaging the step of the through hole.