REDUCED STIFFNESS FEMORAL HIP IMPLANT

A femoral component of an artificial hip joint (20) in- cludes an elongated stem (40) with a single longitudinally extend- ing, medially facing, groove (46). The dimensions of the groove are chosen so as to obtain a magnitude of stiffness no greater than that at which stress shielding of the bone (2...

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Bibliographische Detailangaben
Hauptverfasser:	SERBOUSEK, JON, DINELLO, ALEXANDRE
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	BANDAGES, DRESSINGS OR ABSORBENT PADS CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, ORSURGICAL ARTICLES DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS DISINFECTION, STERILISATION, OR DEODORISATION OF AIR FILTERS IMPLANTABLE INTO BLOOD VESSELS FIRST-AID KITS FOMENTATION HUMAN NECESSITIES HYGIENE MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICALARTICLES MEDICAL OR VETERINARY SCIENCE METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS INGENERAL ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES PROSTHESES TREATMENT OR PROTECTION OF EYES OR EARS
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Beschreibung
Zusammenfassung:	A femoral component of an artificial hip joint (20) in- cludes an elongated stem (40) with a single longitudinally extend- ing, medially facing, groove (46). The dimensions of the groove are chosen so as to obtain a magnitude of stiffness no greater than that at which stress shielding of the bone (24) would occur. The groove (46) and the outer surface of the stem Intersect at an outer rim (56). The groove has a central concave surface (48) and proximal distal radiused end surfaces (50, 52) in communica- tion with and blending smoothly with the central cylindrical con- cave surface (48). The groove is disposed at an angle within a range of 0.degree. to approximately 45.degree. relative to the coronal plane , extending in a lateral posterior to medial anterior direction. The component is preferably composed of titanium, titanium alloy, or cobalt-chromium alloy. The outer surface of the stem may be pro- vided with a porous medium for encouraging bone ingrowth fixa- tion.