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Publication numberUS2622592 A
Publication typeGrant
Publication dateDec 23, 1952
Filing dateJan 5, 1952
Priority dateJan 5, 1952
Publication numberUS 2622592 A, US 2622592A, US-A-2622592, US2622592 A, US2622592A
InventorsRosenstein Max
Original AssigneeRosenstein Max
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
X-ray marker for artificial femoral heads
US 2622592 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)


The present invention relates to artificial femoral heads of transparent material, such as synthetic resins, and more particularly to a position marker in such transparent artificial prostheses.

Artificial transparent femoral heads have been used heretofore in hip arthroplasty but once the femoral heads were in position in the human body, subsequent X-rays failed to reveal whether the head had changed its position, the generally circular and spherical contours of the prosthesis and its parts giving no indication of possible rotational displacement. Since even the slightest dislocations may be of considerable importance, this has been a serious disadvantage.

In accordance with the present invention, there is provided an opaque eccentric marker, preferably of metal, said marker being built into the interior of the transparent femoral head. Allsteel heads are also known, but it would not be possibl to apply such a position marker to the exterior of such a prosthesis since it would create friction between the prosthesis and the bone with which it cooperates. The opaque marker built into the transparent head will appear on an X-ray picture and will signify the exact position of the artificial femoral head at the time of or immediately after the operation. Subsequent X-ray pictures will, by comparison, show whether there has been any dislocation of the prosthesis.

The invention will be more fully described in connection with the single figure of the accompanyin drawing showing an artificial femoral head. In the drawing, l is the substantially hemispherically shaped transparent head and 2 is the stem which secures the head in the bone. As illustrated, the stem is provided with longitudinal grooves 3 which will produce a more solid connection between the bone and the stem. The stem is preferably tapered at the end. The stem and head may be made of any suitable transparent material which remains inert in the human body and various synthetic resins have been found satisfactory. Acrylic and methacrylic polymers have been found suitable but the present invention is not concerned with any specific substance for femoral heads, such substances being known in the art.

Th plastic head and stem are cast on a core of metal, such as steel, comprising a rod 4 corresponding to stem 3 and a disc 5 placed concentrically in head I. Disc 5 carries eccentric stud 6 which fixes the position of the femoral head in the bone. Any rotational movement of the head will result in a movement of position marker 6, easily ascertainable by comparison of X-ray pictures.

The femoral head of the present invention is used in th following manner:

The femoral neck is severed and the femoral head is removed. Thereupon, the neck is perforated from end to end, preferably so that the tunnel-like opening is so oriented that the head is in a slightly coxa-vagoid position. The surface of the neck is then smoothed and so prepared that the base of the artificial head is received in as close a fit as possible. The selected size of prosthesis is then introduced into the fore hole and driven in by means of the drivehead until, by transparency, the rim of the neck is seen to adhere completely to the groove formed by the head at its junction with the stem. After careful reconstruction of the capsule, the muscular and cutaneous planes are closed.

Position marker 5 will appear clearly on any X-ray picture since it is formed of opaque material, preferably integrally with the disc 5.

What is claimed is:

An artificial prosthesis comprising a transparent femoral head and a stem integral therewith, a metal core comprising a disc concentrically arranged in said head and a rod co-axially arranged in said stem, and a metal stud eccentrically secured to said disc.


REFERENCES CKTED The following references are of record in the file of this patent:

The Journal of Bone a Joint Surgery for May 1950, p. 167.

The Journal of Bone & Joint Surgery for October 1951, advertising p. 39.

(Copies of these publications in the Scientific Library.)

Non-Patent Citations
1 *None
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2679245 *Mar 15, 1951May 25, 1954Timmermans Frans DonatusProsthesis for femoral heads
US2785673 *May 6, 1952Mar 19, 1957Anderson RogerFemoral prosthesis
US5178164 *Mar 29, 1991Jan 12, 1993Allen George SMethod for implanting a fiducial implant into a patient
US6273915 *Aug 13, 1997Aug 14, 2001James B. GrimesFemoral head-neck prosthesis and method of implantation
US6371959Apr 5, 2000Apr 16, 2002Michael E. TriceRadiolucent position locating device and drill guide
US6740120Feb 19, 1999May 25, 2004James B. GrimesBone prosthesis and method of Access
US6783553Oct 24, 2001Aug 31, 2004James B. GrimesProsthesis
US8152855Sep 17, 2010Apr 10, 2012Howmedica Osteonics Corp.Method and apparatus for hip femoral resurfacing tooling
US20040078084 *Oct 22, 2002Apr 22, 2004Ricardo AlbertorioProsthetic implant and method of use
US20040193281 *Jan 28, 2004Sep 30, 2004Grimes James B.Bone prosthesis and method of implantation
US20080109085 *Nov 3, 2006May 8, 2008Howmedica Osteonics Corp.Method and apparatus for hip femoral resurfacing tooling
US20100121458 *Nov 18, 2009May 13, 2010Howmedica Osteonics Corp.Femoral head resurfacing
US20110004318 *Jan 6, 2011Howmedica Osteonics Corp.Method and apparatus for hip femoral resurfacing tooling
US20110184528 *Jul 28, 2011Osteomed L.P.Resurfacing Implant
WO2001005336A1 *Jun 16, 2000Jan 25, 2001Eska Implants Gmbh & Co.Implant designed to fill up cartilage and bone defects in joints
WO2006052874A2 *Nov 8, 2005May 18, 2006Small Bone Innovations, Inc.Metatarsal implant
WO2011090711A1Dec 28, 2010Jul 28, 2011Osteomed LlcResurfacing implant
U.S. Classification623/23.11, 606/97
International ClassificationA61B19/00, A61F2/30, A61F2/36, A61F2/00
Cooperative ClassificationA61F2002/3008, A61F2002/3009, A61B19/54, A61F2/3603, A61F2002/30878, A61F2310/00017, A61F2/3601, A61F2002/30299, A61F2250/0098, A61F2250/0091, A61F2230/0093
European ClassificationA61B19/54, A61F2/36A1