DE19811820A1 - Hip joint shaft for a cement-free hip joint prosthesis - Google Patents

Hip joint shaft for a cement-free hip joint prosthesis

Info

Publication number
DE19811820A1
DE19811820A1 DE19811820A DE19811820A DE19811820A1 DE 19811820 A1 DE19811820 A1 DE 19811820A1 DE 19811820 A DE19811820 A DE 19811820A DE 19811820 A DE19811820 A DE 19811820A DE 19811820 A1 DE19811820 A1 DE 19811820A1
Authority
DE
Germany
Prior art keywords
hip joint
joint shaft
shaft according
proximal end
section
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.)
Withdrawn
Application number
DE19811820A
Other languages
German (de)
Inventor
Guenther Zeiler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19811820A priority Critical patent/DE19811820A1/en
Publication of DE19811820A1 publication Critical patent/DE19811820A1/en
Withdrawn legal-status Critical Current

Links

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
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral 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
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • 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
    • A61F2/367—Proximal or metaphyseal 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
    • 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
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    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2/4607—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of hip femoral endoprostheses
    • 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
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    • 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
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    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30138—Convex polygonal shapes
    • A61F2002/30153—Convex polygonal shapes rectangular
    • A—HUMAN NECESSITIES
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    • 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
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
    • A—HUMAN NECESSITIES
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    • 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
    • A61F2002/30795—Blind bores, e.g. of circular cross-section
    • 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
    • A61F2002/3082—Grooves
    • A61F2002/30827—Plurality of grooves
    • A61F2002/30828—Plurality of grooves parallel
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • 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
    • A61F2002/3082—Grooves
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    • 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
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    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
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    • 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
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    • 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
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    • 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
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    • 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
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    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys

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

The shaft (1) at its proximal end (2) is provided with a number of longitudinal grooves (10) with parabolic cross section. Between the grooves there are ridges (11) for cutting into the spongy bone structure. The envelope curve of these ridges circumscribes an asymmetric rectangle with outwardly bowed sides, while the envelope curve of the groove bottoms forms an approximate rectangle.

Description

Die Erfindung richtet sich auf einen Hüftgelenkschaft für eine zementfreie Hüftgelenkprothese mit einem länglichen, in den Knochenmarkraum einzu­ schlagenden Grundkörper und einem am proximalen Ende seitlich wegste­ henden Ansatz mit einem Konus zum Aufsetzen einer Gelenkkugel. Ein derartiger Schaft ist beispielsweise aus der DE 197 46 984 A1 bekannt.The invention is directed to a hip joint shaft for a cementless Hip prosthesis with an elongated, into the bone marrow space striking main body and one sideways at the proximal end approach with a cone to attach a joint ball. A such a shaft is known for example from DE 197 46 984 A1.

Dabei wird grundsätzlich angestrebt, die Querschnittgeometrie eines sol­ chen Schaftes und die Oberflächenstruktur durch das Vorsehen von Stegen so auszubilden, daß eine möglichst gute Rotationsstabilität und ein primär fester Sitz erreicht werden.The basic aim is to achieve the cross-sectional geometry of a sol Chen shaft and the surface structure by the provision of webs to train so that the best possible rotational stability and a primary tight fit can be achieved.

Der Erfindung liegt die Aufgabe zugrunde, durch eine neuartige Formge­ bung Primärstabilität und Rotationssicherheit noch zu erhöhen.The invention has for its object by a novel Formge Exercise to increase primary stability and rotation security.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Querschnitt des Schafts im proximalen Bereich eine Mehrzahl von querschnittlich pa­ rabelförmigen, in Längsrichtung verlaufende Nuten aufweist, welche zwi­ schen sich Stege ausbilden, die sich in die Spongiosa einschneiden, wobei die Hüllkurve der Stege ein asymmetrisch nach außen aufgebauchtes Rechteck umschreibt, während die Hüllkurve der Böden der parabelförmi­ gen Nuten annähernd ein Rechteck ausbildet.This object is achieved in that the cross section of the shaft in the proximal area a plurality of pa cross-section has ravelike, longitudinal grooves, which between bridges are formed which cut into the cancellous bone, whereby the envelope of the bridges is asymmetrically bulged outwards Rectangle circumscribes the envelope of the floors of the parabolic approximately forms a rectangle towards the grooves.

Mit Vorteil kann weiterhin vorgesehen sein, daß die Stege zum distalen Ende hin auslaufen. It can also be advantageously provided that the webs are distal Run out at the end.  

Günstigerweise weist der Hüftgelenkschaft im Bereich des distalen Endes einen rechteckigen Querschnitt auf.The hip joint shaft advantageously has in the region of the distal end a rectangular cross section.

An der proximalen Stirnseite kann eine kugelförmige Einsenkung zum An­ setzen eines Einschlaginstruments ausgebildet sein.A spherical depression can be made on the proximal face set an impact instrument be formed.

Eine besonders vorteilhafte Legierung aufgrund ihrer Körperverträglichkeit für den Hüftgelenkschaft ist die verwendete Titan-Aluminium6-Niob7- Schmiedelegierung.A particularly advantageous alloy due to its body tolerance for the hip joint shaft, the titanium-aluminum6-niobium7- Blacksmith alloy.

Um ein optimales Einwachsen zu gewährleisten, kann vorgesehen sein, daß der Schaft eine Oberflächenrauhigkeit von Rz 40 bis 60 µm aufweist.In order to ensure optimal ingrowth, it can be provided that the shaft has a surface roughness of Rz 40 to 60 µm.

Zusammenfassend läßt sich feststellen, daß durch einen Hüftgelenkschaft der in Betracht stehenden Art eine zementfreie Verankerung mit hoher Primärstabilität und Rotationssicherheit bei proximaler Verankerung er­ reicht werden kann.In summary, it can be said that through a hip joint shaft of the type in question is cement-free anchoring with high Primary stability and rotation security with proximal anchoring can be enough.

Der Querschnitt des konischen Schaftes vermeidet das Füllen des diaphysä­ ren Knochenabschnittes und somit den diaphysären Kontakt mit hoher Vor­ spannung, wodurch eine Verlagerung der Krafteinteilung nach proximal erfolgt. Durch diese proximale Krafteinteilung in die metaphysäre Spongio­ sa und Kortikalis wird eine proximale Knochenatrophie verhindert.The cross-section of the conical shaft prevents the diaphyseal from filling ren bone section and thus the diaphyseal contact with high Vor tension, causing a shift in the force distribution proximally he follows. This proximal division of force into the metaphyseal spongio A proximal bone atrophy is prevented in the sa and cortex.

Die Längsstege im anterioren und posterioren proximalen Schaftbereich verleihen dem Schaft eine bauchige Außengeometrie. The longitudinal bars in the anterior and posterior proximal shaft areas give the shaft a bulbous outer geometry.  

Die Stege erhalten durch ihre parabelförmigen Zwischenräume die Spon­ giosa im proximalen Femur, was eine gute Versorgung der tragenden Kno­ chenstrukturen gewährleistet. Beim Einschlagen des Implantats schneiden sich diese Längsstege einem Spongiosagewinde ähnlich in die proximale metaphysäre Spongiosa ein, verdichten diese und gewährleisten eine ma­ ximale Rotationsstabilität. Ferner erlaubt diese Geometrie dem Operateur den Rückgriff von einem größeren auf den nächstkleineren Prothesenschaft, ohne daß die großflächige Verankerung in der proximalen Metaphyse ver­ mindert wird.The webs receive the spon through their parabolic spaces giosa in the proximal femur, which provides a good supply to the bearing knot guaranteed. Cut when driving the implant these longitudinal webs similar to a cancellous thread in the proximal metaphyseal cancellous bone, compress it and ensure a ma maximum rotational stability. This geometry also allows the surgeon the use of a larger prosthesis socket on the next smaller one, without ver ver the large-scale anchoring in the proximal metaphysis is reduced.

Nachfolgend wird die Erfindung anhand eines bevorzugten Ausführungs­ beispiels in Verbindung mit der Zeichnung näher erläutert. Dabei zeigen:The invention is described below on the basis of a preferred embodiment example explained in connection with the drawing. Show:

Fig. 1 eine Seitenansicht eines erfindungsgemäßen Hüftgelenkschaftes, Fig. 1 is a side view of a hip stem according to the invention,

Fig. 2 eine um 90° gegenüber Fig. 1 gedrehte Ansicht, Fig. 2 rotated by 90 ° relative to Fig. 1 view,

Fig. 3 einen Schnitt längs der Schnittlinie III-III in Fig. 1 Fig. 3 is a section along the line III-III in Fig. 1

Fig. 4 einen Schnitt längs der Schnittlinie IV-IV in Fig. 1, und Fig. 4 is a section along the section line IV-IV in Fig. 1, and

Fig. 5 einen Schnitt längs der Linie V-V in Fig. 1. Fig. 5 is a section along line VV in FIG. 1.

Ein in der Zeichnung dargestellter Hüftgelenkschaft 1 weist eine konische Grundform auf, d. h. er verjüngt sich vom proximalen Ende 2 hin zum distalen Ende 3 konisch. A hip joint shaft 1 shown in the drawing has a conical basic shape, ie it tapers conically from the proximal end 2 to the distal end 3 .

Am proximalen Ende 2 ist ein sich schräg zur Seite wegerstreckender An­ satz 4 mit einem genormten Konusabschnitt 5 zum Aufsetzen einer in der Zeichnung nicht dargestellten Gelenkkugel vorgesehen.At the proximal end 2 is an obliquely extending to the side to set 4 with a standardized cone section 5 for attaching a joint ball, not shown in the drawing.

Die proximale Stirnseite 6 weist eine kugelförmige Einsenkung 7 zum An­ setzen eines Einschlaginstruments auf.The proximal end face 6 has a spherical depression 7 for setting an impact instrument.

Im proximalen Ende 2 sind in die Seitenflächen 8 und in die dem Ansatz 4 abgewandte Stirnseite 9 parabelförmige Nuten 10 eingebracht, welche zwi­ schen sich zur Außenseite hin spitz zulaufende Stege 11 ausbilden. Die Hüllkurve 12 der Stegaußenkanten bzw. des Grundkörpers 13 weist die Form eines asymmetrisch nach außen aufgebauchten Rechtecks auf, wäh­ rend die Hüllkurve der Böden der Nuten 10 im wesentlichen ein Rechteck bilden.In the proximal end 2 , parabolic grooves 10 are introduced into the side faces 8 and into the end face 9 facing away from the shoulder 4 , which form between webs 11 tapering towards the outside. The envelope curve 12 of the web outer edges or of the base body 13 has the shape of an asymmetrically bulged rectangle, while the envelope curve of the bottoms of the grooves 10 essentially form a rectangle.

Wie eine Gegenüberstellung der Fig. 3 bis 5 zeigt, laufen die Stege 11 zum distalen Ende 3 hin aus und der Querschnitt nähert sich immer stärker einer Rechteckform.As a comparison of FIGS. 3 to 5 shows, the webs 11 run out towards the distal end 3 and the cross section increasingly approaches a rectangular shape.

Claims (6)

1. Hüftgelenkschaft für eine zementfreie Hüftgelenkprothese mit einem länglichen, in den Knochenmarkraum einzuschlagenden Grundkörper und einem am proximalen Ende seitlich wegstehenden Ansatz mit einem Konus zum Aufsetzen einer Gelenkkugel, dadurch gekennzeichnet, daß der Querschnitt des Schafts im proximalen Ende (2) eine Mehrzahl von para­ belförmigen, in Längsrichtung verlaufender Nuten (10) aufweist, welche zwischen sich Stege (11) ausbilden, die sich in die Spongiosa einschneiden, wobei die Hüllkurve (12) der Stege (11) ein asymmetrisch nach außen auf­ gebauchtes Rechteck umschreibt, während die Hüllkurve (12) der Böden der parabelförmigen Nuten (10) annähernd ein Rechteck ausbildet.1. Hip joint shaft for a cementless hip joint prosthesis with an elongated base body to be driven into the bone marrow space and a shoulder projecting laterally at the proximal end with a cone for fitting a joint ball, characterized in that the cross section of the shaft in the proximal end ( 2 ) has a plurality of para Belbeligen, extending in the longitudinal direction of grooves ( 10 ), which form webs ( 11 ) between themselves, which cut into the cancellous bone, the envelope curve ( 12 ) of the webs ( 11 ) circumscribes an asymmetrically outward on a bulged rectangle, while the envelope curve ( 12 ) of the bases of the parabolic grooves ( 10 ) approximately forms a rectangle. 2. Hüftlenkschaft nach Anspruch 1, dadurch gekennzeichnet, daß die Ste­ ge (11) zum distalen Ende (3) hin auslaufen.2. hip steering shaft according to claim 1, characterized in that the Ste ge ( 11 ) to the distal end ( 3 ) run out. 3. Hüftgelenkschaft nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß er im Bereich des distalen Endes (3) einen rechteckigen Querschnitt aufweist.3. Hip joint shaft according to claim 1 or 2, characterized in that it has a rectangular cross section in the region of the distal end ( 3 ). 4. Hüftgelenkschaft nach Anspruch 1, dadurch gekennzeichnet, daß an der proximalen Stirnseite (6) eine kugelförmige Einsenkung (7) zum Anset­ zen eines Einschlaginstruments ausgebildet ist.4. Hip joint shaft according to claim 1, characterized in that on the proximal end face ( 6 ) a spherical depression ( 7 ) is formed for the application of an impact instrument. 5. Hüftgelenkschaft nach Anspruch 1, dadurch gekennzeichnet, daß er aus einer für medizinische Zwecke geeigneten Titanschmiedelegierung besteht. 5. hip joint shaft according to claim 1, characterized in that it consists of there is a titanium forged alloy suitable for medical purposes.   6. Hüftgelenkschaft nach Anspruch 1, dadurch gekennzeichnet, daß er eine Oberflächenrauhigkeit von Rz 40 bis 60 µm aufweist.6. hip joint shaft according to claim 1, characterized in that it has a surface roughness of Rz 40 to 60 µm.
DE19811820A 1998-03-18 1998-03-18 Hip joint shaft for a cement-free hip joint prosthesis Withdrawn DE19811820A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19811820A DE19811820A1 (en) 1998-03-18 1998-03-18 Hip joint shaft for a cement-free hip joint prosthesis

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19935289C1 (en) * 1999-07-27 2001-05-17 Biomet Merck Deutschland Gmbh Thigh part of a hip endoprosthesis
FR2853524A1 (en) * 2003-04-11 2004-10-15 Groupe Lepine Range of femoral implants for hip prostheses has medullary sections and necks that increase or reduce in size by even amounts
FR2887137A1 (en) * 2005-06-17 2006-12-22 C2M Implants Femoral rod for hip prosthesis, has proximal and distal parts with specific inclination with respect to rod`s plane of symmetry so that parts form specific angle, where proximal parts extend along specific height of shank
FR2935893A1 (en) * 2008-09-17 2010-03-19 T O FEMALE HIP PROSTHESIS ROD

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0058745A1 (en) * 1981-02-19 1982-09-01 GebràœDer Sulzer Aktiengesellschaft Straight blade like shaft for a joint endoprosthesis
EP0098224A1 (en) * 1982-06-29 1984-01-11 Gérald Lord Bone prosthesis and its manufacture
EP0135755A1 (en) * 1983-08-29 1985-04-03 Protek AG Stem for a hip joint prosthesis
DE3505997C2 (en) * 1984-05-21 1987-03-12 Gebrueder Sulzer Ag, Winterthur, Ch
DE3609119A1 (en) * 1986-03-15 1987-09-24 Mecron Med Prod Gmbh Method of producing a non-mirror-symmetrical stem of a hip prosthesis
DE3829361C2 (en) * 1988-02-10 1990-03-15 Orthoplant Endoprothetik Gmbh, 2800 Bremen, De
DE3819948C2 (en) * 1988-06-11 1990-06-13 Orthoplant Endoprothetik Gmbh, 2800 Bremen, De
EP0499480A1 (en) * 1991-02-15 1992-08-19 Aesculap Limited Hip implants
EP0668064A1 (en) * 1994-02-16 1995-08-23 Wright Medical Technology, Inc. An intramedullary implant with optimized geometric stiffness
DE29701082U1 (en) * 1997-01-23 1998-05-28 Haimayer, Alwin, 84079 Bruckberg Femoral component for a hip prosthesis

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0058745A1 (en) * 1981-02-19 1982-09-01 GebràœDer Sulzer Aktiengesellschaft Straight blade like shaft for a joint endoprosthesis
EP0098224A1 (en) * 1982-06-29 1984-01-11 Gérald Lord Bone prosthesis and its manufacture
EP0135755A1 (en) * 1983-08-29 1985-04-03 Protek AG Stem for a hip joint prosthesis
DE3505997C2 (en) * 1984-05-21 1987-03-12 Gebrueder Sulzer Ag, Winterthur, Ch
DE3609119A1 (en) * 1986-03-15 1987-09-24 Mecron Med Prod Gmbh Method of producing a non-mirror-symmetrical stem of a hip prosthesis
DE3829361C2 (en) * 1988-02-10 1990-03-15 Orthoplant Endoprothetik Gmbh, 2800 Bremen, De
DE3819948C2 (en) * 1988-06-11 1990-06-13 Orthoplant Endoprothetik Gmbh, 2800 Bremen, De
EP0499480A1 (en) * 1991-02-15 1992-08-19 Aesculap Limited Hip implants
EP0668064A1 (en) * 1994-02-16 1995-08-23 Wright Medical Technology, Inc. An intramedullary implant with optimized geometric stiffness
DE29701082U1 (en) * 1997-01-23 1998-05-28 Haimayer, Alwin, 84079 Bruckberg Femoral component for a hip prosthesis

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19935289C1 (en) * 1999-07-27 2001-05-17 Biomet Merck Deutschland Gmbh Thigh part of a hip endoprosthesis
FR2853524A1 (en) * 2003-04-11 2004-10-15 Groupe Lepine Range of femoral implants for hip prostheses has medullary sections and necks that increase or reduce in size by even amounts
FR2887137A1 (en) * 2005-06-17 2006-12-22 C2M Implants Femoral rod for hip prosthesis, has proximal and distal parts with specific inclination with respect to rod`s plane of symmetry so that parts form specific angle, where proximal parts extend along specific height of shank
FR2935893A1 (en) * 2008-09-17 2010-03-19 T O FEMALE HIP PROSTHESIS ROD
FR2935892A1 (en) * 2008-09-17 2010-03-19 T O FEMALE HIP PROSTHESIS ROD
WO2010031922A1 (en) * 2008-09-17 2010-03-25 T.O. Femoral rod for a hip prosthesis

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