GB2104391A - Spacer for intra-medullary implant - Google Patents

Spacer for intra-medullary implant Download PDF

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Publication number
GB2104391A
GB2104391A GB08224047A GB8224047A GB2104391A GB 2104391 A GB2104391 A GB 2104391A GB 08224047 A GB08224047 A GB 08224047A GB 8224047 A GB8224047 A GB 8224047A GB 2104391 A GB2104391 A GB 2104391A
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GB
United Kingdom
Prior art keywords
spacer
stem
implant
cement
bore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08224047A
Other versions
GB2104391B (en
Inventor
Alan John Clive Lee
Robin Sidney Mackwood Ling
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University of Exeter
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University of Exeter
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by University of Exeter filed Critical University of Exeter
Priority to GB08224047A priority Critical patent/GB2104391B/en
Publication of GB2104391A publication Critical patent/GB2104391A/en
Application granted granted Critical
Publication of GB2104391B publication Critical patent/GB2104391B/en
Expired legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30721—Accessories
    • A61F2/30724—Spacers for centering an implant in a bone cavity, e.g. in a cement-receiving cavity
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30721—Accessories
    • A61F2/30723—Plugs or restrictors for sealing a cement-receiving space
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2/3676—Distal or diaphyseal parts of shafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/3006—Properties of materials and coating materials
    • A61F2002/3008—Properties of materials and coating materials radio-opaque, e.g. radio-opaque markers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30563—Special structural features of bone or joint prostheses not otherwise provided for having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30884—Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30891—Plurality of protrusions
    • A61F2002/30896—Plurality of protrusions perpendicular with respect to each other
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2002/4631—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor the prosthesis being specially adapted for being cemented
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
    • A61F2250/0096—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers
    • A61F2250/0098—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers radio-opaque, e.g. radio-opaque markers

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Abstract

In surgery in which an implant stem 10 is located in a medullary canal 12 by cement 20, a plastics spacer 26 has resilient fingers 36 to keep the stem 10 away from the canal wall. The spacer has a stopped bore 32 to receive the stem 10 with a void 34 beneath it. This allows the stem 10 to sink if the cement contracts, without producing cracks in the cement. <IMAGE>

Description

SPECIFICATION Spacer for intra-medullary implant This invention relates to surgery in which an implant is placed in the medullary canal of a bone. For example, when a patient is given an artificial hip joint, an implant is necessary in the medullary canal of a femur (see for example U.K. Patent No. 1409054). Such an implant is located in the medullary canal by use of a bone cement, e.g. polymethylmethacrylate cement. It has been demonstrated by laboratory tests as well as by clinical experience that there is considerable advantage in keeping the whole of the implant stem, its tip in particular, away from touching the bone of the host and completely enclosed in a mantle of cement. The present inventors have previously proposed a spacer for this purpose (see U.K. No. 1409053).
Fig. 1 of the accompanying drawings shows such an implant 10 located in the medullary canal 12 of a femur 14. The spacer of U.K.
Patent No. 1409053 is shown at 16, and comprises an annular base member around the implant stem, and a plurality of spring members 18 diverging therefrom to contact the wall of the canal. The implant stem 10 is surrounded by a mantle of acrylic cement 20, and a plug 22 as described in U.K. Patent Specification No. 2054383 prevents penetration of the cement further down the medullary canal.
Clinical experience with this intra-medullary implant has shown that some sinkage of the implant within the femur can sometimes take place. Such sinkage is usually caused by relatively poor cement technique, but nevertheless it occurs in practice and is usually accompanied by cement cracking (shown at 24 in Fig. 1). It is also known that some expansion and contraction of the bone cement takes place during its curing cycle and during the first few weeks of its existence in the patient. It is postulated by many experimenters and clinicians that the result of this change in size of the cement is a very small gap between stem and cement.Where the stem is tapered as shown in Fig. 1, this gap can be taken up by the stem sinking slightly relative to the cement. ! However, the tip of the stem is not able to move through the cement below it without causing cracks such as at 24, and this obviously results in unreliability of the anchorage provided by cement.
The present invention provides a spacer for the stem of an intra-medullary implant, comprising a body having a stopped bore for receiving the tip of the implant stem, and a plurality of generally radially extending resilient members for engaging the sides of the medullary canal to hold the body away from the sides of the medullary canal. It is accordingly possible to insert the tip of the implant stem in the bore, leaving a void in the bore beneath the tip, into which the tip of the stem can sink.
In the accompanying drawings: Figure 1 is a cross-section through part of a femur showing a known means for fixing an intra-medullary implant, Figure 2 is a cross-section through part of a femur showing a spacer according to the present invention in use, and Figure 3 is a perspective view of the spacer shown in Fig. 2.
Referring to Figs. 2 and 3 an intra-medullary implant of the type shown in Fig. 1 and in British Patent No. 1409054 has a tapering stem 10. It is located in the medullary canal 12 of a femur 14 by polymethylmethacrylate bone cement 20 in a similar manner to that shown in Fig. 1, except for the form of the spacer. Instead of an annular spacer 16 fitting over the end of the stem 10, so that the stem 10 protrudes slightly on the underside of the spacer, there is provided a spacer 26 having a cylindrical body 28. The bottom end 30 of the body 28 is domed, and a longitudinal bore 32 opens at the top end of the spacer.
The bore 32 extends most of the way through the body 28, but is stopped just before the domed end 30. In use, as shown in Fig. 2, the bore 32 is a push-fit on the tip of the stem 10, and is not fitted right the way onto the tip, but rather a void 34 is left at the inner end of the bore 32. The bore 32 should be a relatively tight push-fit on the stem 10, so that that this void remains even after the tip of the stem and the spacer have been inserted in the medullary canal.
Although the bore 32 is stopped as described above, a small air vent passage 40 is provided, extending longitudinally from the inner end of the bore 32 to the domed end 30 of the body 28. This assists in fitting the spacer onto the tip of the implant stem, since it allows air to escape from the void 34.
As best seen in Fig. 3, four resilient members 36 extend radially and upwardly from a point on the body 28 near the domed end 30. These are linked to the body 28 by respective thin webs 38, forming four wings, fins or ribs projecting from the side of the body 28. In use, the members 36 resiliently engage with the sides of the medullary canal, and the webs 38 collapse to take up tolerances in the diameter of the cavity in the canal.
In use, the implant is secured in the medullary canal as is conventional, with the spacer 26 in position on the tip of the stem 10 in order to hold the stem away from the sides of the medullary canal. The void 34 is of course left in the body 28. If there should be contraction of the bone cement 20, or if a gap should develop between the implant 10 and bone cement for any other reason, the tapered stem will sink and settle in the cement, and this is accommodated by the tip of the stem sinking into the void 34. It will be appreciated that such sinkage into the void 34 does not put any pressure on cement underneath the tip of the stem 10, and so such sinkage can occur without causing cracking of the cement.
The spacer is moulded from a surgical grade of plastics material, for example ultra high molecular weight polyethylene. This is because there is some doubt as to the suitability of metal as a spacer material, as corrosion between the spacer 26 and the stem 10 can occur in theory although it has not been observed in practice. Furthermore, if it is ever necessary to remove the implant and cement from a patient (during the course of a revision operation for example) a metal material could make extraction of the cement more difficult. The plastics material used in the present embodiment, however, can be drilled out with ease.
So that the spacer device is visible on any subsequent X-rays, a thin band 42 of a radio opaque material such as metal is provided around the body 28, to act as an X-ray marker.
The body 28 could have a truncated conical shape if desired, instead of the cylindrical shape shown. It would also be possible to omit the webs 38 if desired, leaving just the four resilient fingers 36.

Claims (7)

1. A spacer for the stem of an intramedullary implant, comprising a body having a stopped bore for receiving the tip of the implant stem, and a plurality of generally radially extending resilient members for engaging the sides of the medullary canal to hold the body away from the sides of the medullary canal.
2. A spacer according to claim 1, including an air vent passage leading from the inner end of the stopped bore to permit the escape of air from the bore.
3. A spacer according to claim 1 or 2 wherein the bore extends downwardly from an upper end of the spacer, and the resilient members extend both radially and upwardly.
4. A spacer according to claim 1, 2 or 3 wherein collapsible webs extend between the resilient members and the body.
5. A spacer according to any one of the preceding claims, moulded from plastics ma trial.
6. A spacer according to claim 5 having an X-ray marker made from a radio-opaque material.
7. A spacer for the stem of an intramedullary implant, substantially as described herein with reference to Figs. 2 and 3 of the accompanying drawings.
GB08224047A 1981-08-25 1982-08-20 Spacer for intra-medullary implant Expired GB2104391B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08224047A GB2104391B (en) 1981-08-25 1982-08-20 Spacer for intra-medullary implant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8125927 1981-08-25
GB08224047A GB2104391B (en) 1981-08-25 1982-08-20 Spacer for intra-medullary implant

Publications (2)

Publication Number Publication Date
GB2104391A true GB2104391A (en) 1983-03-09
GB2104391B GB2104391B (en) 1984-12-19

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Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4670015A (en) * 1984-04-13 1987-06-02 Finsbury (Instruments) Limited Hip implant
US4718909A (en) * 1985-07-16 1988-01-12 Brown Byron L Method and apparatus for cementing a femoral stem prosthesis within a femoral canal
FR2632182A1 (en) * 1988-06-06 1989-12-08 Antonietti Pierre Anchoring rod endpiece for total joint prostheses
EP0427444A1 (en) * 1989-11-06 1991-05-15 Howmedica International Inc. Centraliser for the stem of an intramedullary prosthesis
US5035717A (en) * 1988-05-12 1991-07-30 Brooks Peter J Insert and method of using same
EP0457464A1 (en) * 1990-05-17 1991-11-21 Howmedica International Inc. Prosthetic intramedullary femoral prosthesis with preformed sheath
US5108439A (en) * 1990-10-25 1992-04-28 Sulzer Brothers Limited Centering element for a shank of a joint endoprosthesis
US5116380A (en) * 1991-02-28 1992-05-26 Zimmer, Inc. Prosthetic implant with spacers having tapered trailing edges
US5171286A (en) * 1990-08-08 1992-12-15 Howmedica International Inc. Cemented taper lock acetabular cup
EP0530323A4 (en) * 1990-05-23 1994-04-13 Mikhail, Michael W.E.
US5480450A (en) * 1993-02-11 1996-01-02 The General Hospital Corporation Method and apparatus for reducing interfacial porosity in a cemented femoral prosthesis
US5507831A (en) * 1994-01-03 1996-04-16 Burke; Dennis W. Distal stem centralizer for femoral prosthesis
US5554192A (en) * 1994-10-05 1996-09-10 Zimmer, Inc. Intramedullary implant stem and centralizer
EP0743048A2 (en) * 1991-07-11 1996-11-20 Anton Prof. Dr. Härle Centering element for bone implants
WO1997004723A1 (en) * 1995-07-31 1997-02-13 Howmedica Inc. Intramedullary centralizer
FR2751527A1 (en) * 1996-07-24 1998-01-30 Asquier Philippe Femoral rod for cement type hip prosthesis
US5755793A (en) * 1996-09-04 1998-05-26 Bristol-Myers Squibb Company Centralizer for a prosthetic implant
FR2772595A1 (en) * 1997-12-22 1999-06-25 Groupe Lepine Centering device for distal end of medullary shank, especially of hip prosthesis
WO1999048445A1 (en) 1998-03-24 1999-09-30 Depuy International Limited An end cap spacer for a joint prosthesis
WO1999048444A1 (en) * 1998-03-23 1999-09-30 Johnson & Johnson Medical Limited Prosthetic stem and centraliser
EP0962197A2 (en) 1998-06-04 1999-12-08 Benoist Girard Et Cie Prosthesis with centraliser and centraliser for use therewith
EP0993811A1 (en) * 1998-10-08 2000-04-19 Johnson &amp; Johnson Medical Limited Centraliser
EP1013243A2 (en) 1998-12-21 2000-06-28 Benoist Girard Et Cie Femoral component for use in replacement hip joint
EP0927545A3 (en) * 1997-12-29 2000-10-11 Johnson &amp; Johnson Professional, Inc. Hip stem cement spacer
EP0962198A3 (en) * 1998-06-04 2001-09-12 Benoist Girard Sas Plugging and centralising device for locating the stem of a prosthesis
EP1132062A1 (en) 2000-03-01 2001-09-12 Sulzer Orthopedics Ltd. Cement affixated shaft prosthesis

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5697932A (en) 1994-11-09 1997-12-16 Osteonics Corp. Bone graft delivery system and method

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4670015A (en) * 1984-04-13 1987-06-02 Finsbury (Instruments) Limited Hip implant
US4718909A (en) * 1985-07-16 1988-01-12 Brown Byron L Method and apparatus for cementing a femoral stem prosthesis within a femoral canal
US5035717A (en) * 1988-05-12 1991-07-30 Brooks Peter J Insert and method of using same
FR2632182A1 (en) * 1988-06-06 1989-12-08 Antonietti Pierre Anchoring rod endpiece for total joint prostheses
EP0427444A1 (en) * 1989-11-06 1991-05-15 Howmedica International Inc. Centraliser for the stem of an intramedullary prosthesis
US5092892A (en) * 1989-11-06 1992-03-03 Howmedica International Inc. Intramedullary centralizer
US5197990A (en) * 1990-05-17 1993-03-30 Howmedica International, Inc. Prosthetic intramedullary femoral prosthesis with preformed sheath
EP0457464A1 (en) * 1990-05-17 1991-11-21 Howmedica International Inc. Prosthetic intramedullary femoral prosthesis with preformed sheath
EP0530323A4 (en) * 1990-05-23 1994-04-13 Mikhail, Michael W.E.
US5171286A (en) * 1990-08-08 1992-12-15 Howmedica International Inc. Cemented taper lock acetabular cup
EP0483057A1 (en) * 1990-10-25 1992-04-29 SULZER Medizinaltechnik AG Centraliser for the end of a joint prosthesis stem
US5108439A (en) * 1990-10-25 1992-04-28 Sulzer Brothers Limited Centering element for a shank of a joint endoprosthesis
US5116380A (en) * 1991-02-28 1992-05-26 Zimmer, Inc. Prosthetic implant with spacers having tapered trailing edges
EP0743048A2 (en) * 1991-07-11 1996-11-20 Anton Prof. Dr. Härle Centering element for bone implants
EP0743048A3 (en) * 1991-07-11 1997-12-17 Anton Prof. Dr. Härle Centering element for bone implants
US5480450A (en) * 1993-02-11 1996-01-02 The General Hospital Corporation Method and apparatus for reducing interfacial porosity in a cemented femoral prosthesis
US5507831A (en) * 1994-01-03 1996-04-16 Burke; Dennis W. Distal stem centralizer for femoral prosthesis
US5554192A (en) * 1994-10-05 1996-09-10 Zimmer, Inc. Intramedullary implant stem and centralizer
WO1997004723A1 (en) * 1995-07-31 1997-02-13 Howmedica Inc. Intramedullary centralizer
FR2751527A1 (en) * 1996-07-24 1998-01-30 Asquier Philippe Femoral rod for cement type hip prosthesis
US5755793A (en) * 1996-09-04 1998-05-26 Bristol-Myers Squibb Company Centralizer for a prosthetic implant
FR2772595A1 (en) * 1997-12-22 1999-06-25 Groupe Lepine Centering device for distal end of medullary shank, especially of hip prosthesis
EP0927545A3 (en) * 1997-12-29 2000-10-11 Johnson &amp; Johnson Professional, Inc. Hip stem cement spacer
WO1999048444A1 (en) * 1998-03-23 1999-09-30 Johnson & Johnson Medical Limited Prosthetic stem and centraliser
WO1999048445A1 (en) 1998-03-24 1999-09-30 Depuy International Limited An end cap spacer for a joint prosthesis
EP0962197A2 (en) 1998-06-04 1999-12-08 Benoist Girard Et Cie Prosthesis with centraliser and centraliser for use therewith
EP0962198A3 (en) * 1998-06-04 2001-09-12 Benoist Girard Sas Plugging and centralising device for locating the stem of a prosthesis
EP0993811A1 (en) * 1998-10-08 2000-04-19 Johnson &amp; Johnson Medical Limited Centraliser
EP1013243A2 (en) 1998-12-21 2000-06-28 Benoist Girard Et Cie Femoral component for use in replacement hip joint
EP1013243A3 (en) * 1998-12-21 2002-10-16 Benoist Girard Sas Femoral component for use in replacement hip joint
EP1132062A1 (en) 2000-03-01 2001-09-12 Sulzer Orthopedics Ltd. Cement affixated shaft prosthesis

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