Short implanted prosthesis with dual inner chambers and method of making same

A proactive short cervical femoral endoprosthesis comprising:

• a cylindrical body having an outer surface provided with a helicoidal spire configured to engage bone, and an inner surface defining an interior chamber, wherein the interior chamber has variable lengths, diameters, and shapes along its axial extend;
• the interior chamber communicating with an arborization system comprising a plurality of transversal orifices of variable diameter extending from the interior chamber to the exterior of the body, wherein at least a portion of each orifice is circular in transverse cross-section;
• the orifices being arranged horizontally at variable angles between 90 and 180 degrees so as to distribute orthopedic cement and osteo-stimulating substances from the interior chamber to surrounding bone tissue;
• the interior chamber including a middle threaded portion configured for insertion of a syringe to deliver the orthopedic cement and osteo-stimulating substances;
• a plug having a circular transverse cross-section and a major axis aligned with a longitudinal axis of the body, wherein a first portion of the plug is sized to fit within a portion of the interior chamber, and a second portion of the plug is threaded to engage the middle threaded portion of the chamber, the plug being configured when threaded into the middle threaded portion, to divide the interior chamber into a proximal compartment and a distinct distal compartment while sealing the chamber to prevent mixing or leakage of the orthopedic cement and osteo-stimulating substances after delivery;
• a collar located above the threaded portion of the outer surface of the body, the collar having a cylindrical chamber in communication with the interior chamber of the body and having a main axis aligned with the longitudinal axis of the body;
• and a tronconic (frustoconical) neck configured to receive and fix a prosthesis head or cap, the neck including a hexagonal orifice axially aligned with the longitudinal axis of the body and the collar, the hexagonal orifice communicating with the interior chamber and the cylindrical chamber of the collar to permit introduction of the orthopedic cement and osteo-stimulating substances, and being further configured to receive a dynamometric screwdriver for fixation of the endoprosthesis.