FR2678509A3 - Hip prosthesis - Google Patents

Hip prosthesis Download PDF

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Publication number
FR2678509A3
FR2678509A3 FR9108650A FR9108650A FR2678509A3 FR 2678509 A3 FR2678509 A3 FR 2678509A3 FR 9108650 A FR9108650 A FR 9108650A FR 9108650 A FR9108650 A FR 9108650A FR 2678509 A3 FR2678509 A3 FR 2678509A3
Authority
FR
France
Prior art keywords
prosthesis
rod
converge
angle
distal
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
FR9108650A
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French (fr)
Other versions
FR2678509B3 (en
Inventor
Olivier Boudot
Remi Cavagna
Philippe Cottin
Foll Gerard Le
Saout Jacques Le
Jean-Marc Maignan
Thierrypages Christian Musset
Michel Serrault
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.)
LEFOLL GERARD
LESAOUT JACQUES
MAIGNAN JEAN MARC
Original Assignee
LEFOLL GERARD
LESAOUT JACQUES
MAIGNAN JEAN MARC
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Publication date
Application filed by LEFOLL GERARD, LESAOUT JACQUES, MAIGNAN JEAN MARC filed Critical LEFOLL GERARD
Priority to FR9108650A priority Critical patent/FR2678509B3/en
Publication of FR2678509A3 publication Critical patent/FR2678509A3/en
Application granted granted Critical
Publication of FR2678509B3 publication Critical patent/FR2678509B3/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/36Femoral heads ; Femoral endoprostheses
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108Shapes
    • A61F2002/3011Cross-sections or two-dimensional shapes
    • A61F2002/30112Rounded shapes, e.g. with rounded corners
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108Shapes
    • A61F2002/3011Cross-sections or two-dimensional shapes
    • A61F2002/30112Rounded shapes, e.g. with rounded corners
    • A61F2002/30125Rounded shapes, e.g. with rounded corners elliptical or oval
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108Shapes
    • A61F2002/3011Cross-sections or two-dimensional shapes
    • A61F2002/30138Convex polygonal shapes
    • A61F2002/30158Convex polygonal shapes trapezoidal
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316The 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
    • A61F2002/30535Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30604Special structural features of bone or joint prostheses not otherwise provided for modular
    • A61F2002/30616Sets comprising a plurality of prosthetic parts of different sizes or orientations
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/36Femoral heads ; Femoral endoprostheses
    • A61F2/3609Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3625Necks
    • A61F2002/3631Necks with an integral complete or partial peripheral collar or bearing shoulder at its base
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004Rounded shapes, e.g. with rounded corners
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004Rounded shapes, e.g. with rounded corners
    • A61F2230/0008Rounded shapes, e.g. with rounded corners elliptical or oval
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0017Angular shapes
    • A61F2230/0026Angular shapes trapezoidal
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2310/00Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005The prosthesis being constructed from a particular material
    • A61F2310/00011Metals or alloys
    • A61F2310/00017Iron- or Fe-based alloys, e.g. stainless steel

Abstract

This prosthesis is of the type comprising a shaft (1) which is of a generally flattened shape with rounded edges and which is intended to be implanted in the centromedullary cavity of a femur, the cross-section of which diminishes progressively from the proximal end towards its distal end; according to the invention, the metaphyseal portion (10) has plane lateral faces (10a, 10b), the planes of which converge both on the inner side of the prosthesis and in the distal direction, and do so symmetrically with respect to a frontal plane (F).

Description

PROTHESE DE LA HANCHE
La présente invention concerne une prothèse de la hanche.
HIP PROSTHESIS
The present invention relates to a hip prosthesis.

Elle concerne plus précisément une prothèse du type comportant une tige de forme générale aplatie à bords arrondis qui est destinée à être implantée dans le canal centro-médullaire d'un fémur, la section transversale de cette tige diminuant progressivement de son extrémité proximale vers son extrémité distale. More specifically, it relates to a prosthesis of the type comprising a generally flattened rod with rounded edges which is intended to be implanted in the medullary canal of a femur, the cross section of this rod gradually decreasing from its proximal end towards its end. distal.

Ce type de prothèse de la hanche est extrêmement répandu. This type of hip prosthesis is extremely widespread.

Certains modèles sont monoblocs, leur tige, leur col, et leur tête étant fabriqués en une seule pièce. D'autres modèles sont réalisés en deux parties, la tête étant rapportée par embotement sur une portion de forme tronconique portée par le col. Some models are monobloc, their rod, neck, and head being made in one piece. Other models are produced in two parts, the head being attached by embedding on a portion of frustoconical shape carried by the neck.

La retenue de la tige dans le canal centro-médullaire du fémur se fait généralement par l'intermédiaire d'un ciment. The retention of the rod in the medullary canal of the femur is generally done by means of a cement.

La présente invention a pour objectif principal de réduire très sensiblement la quantité de ciment nécessaire à la bonne implantation de la prothèse, tout en réalisant un ancrage particulièrement efficace et durable de celle-ci à l'intérieur du fémur. The main objective of the present invention is to very significantly reduce the quantity of cement necessary for the correct implantation of the prosthesis, while achieving a particularly effective and durable anchoring thereof within the femur.

Ce résultat est atteint grâce à la forme particulière donnée à la portion supérieure de la tige, c'est-à-dire la portion correspondant à la métaphyse fémorale. This result is achieved thanks to the particular shape given to the upper portion of the stem, that is to say the portion corresponding to the femoral metaphysis.

A cet effet, la portion métaphysaire de la tige de prothèse selon l'invention possède des faces latérales planes, dont les plans convergent à la fois du côté interne de la prothèse et dans la direction distale, ceci de manière symétrique par rapport à un plan frontal médian. To this end, the metaphyseal portion of the prosthesis stem according to the invention has flat lateral faces, the planes of which converge both on the internal side of the prosthesis and in the distal direction, this symmetrically with respect to a plane. medial frontal.

De préférence, l'angle de convergence de ces deux plans du côté interne de la prothèse est compris entre 5 et 100 et est avantageusement de l'ordre de 7 à 80.  Preferably, the angle of convergence of these two planes on the internal side of the prosthesis is between 5 and 100 and is advantageously of the order of 7 to 80.

Selon la direction distale, l'angle de convergence est de préférence compris entre 4 et 80, avantageusement de l'ordre de 60, au voisinage du bord externe, tandis qu'au voisinage du bord interne cet angle est compris entre 2 et 40, de préférence de l'ordre de 30. In the distal direction, the convergence angle is preferably between 4 and 80, advantageously of the order of 60, in the vicinity of the outer edge, while in the vicinity of the inner edge this angle is between 2 and 40, preferably around 30.

Enfin, avantageusement, le rapport de la longueur totale de la tige de la prothèse et de la longueur de la portion métaphysaire est de 3,5 environ. Finally, advantageously, the ratio of the total length of the stem of the prosthesis and the length of the metaphyseal portion is approximately 3.5.

D'autres caractéristiques et avantages de l'invention apparaîtront de la description et des dessins annexés qui en présentent un mode de réalisation préférentiel. Other characteristics and advantages of the invention will appear from the description and the attached drawings which show a preferred embodiment.

Sur ces dessins
- la figure 1 est une vue de face d'une prothèse selon l'invention ;
- la figure 2 est une vue de côté (vue de gauche) de la prothèse de la figure 1
- les figures 3, 4 et 5 sont des sections transversales de la tige de prothèse coupée respectivement par les plans 111-111,
IV-IV et V-V de la figure 1
- la figure 6 est un schéma montrant la disposition angulaire particulière des deux faces latérales de la portion métaphysaire de la tige
- les figures 7 et 8 sont des schémas illustrant les principales cotes de deux modèles de prothèse conforme à l'invention, mais de calibres différents.
On these drawings
- Figure 1 is a front view of a prosthesis according to the invention;
- Figure 2 is a side view (left view) of the prosthesis of Figure 1
FIGS. 3, 4 and 5 are cross sections of the prosthesis rod cut respectively by planes 111-111,
IV-IV and VV of figure 1
- Figure 6 is a diagram showing the particular angular arrangement of the two lateral faces of the metaphyseal portion of the rod
- Figures 7 and 8 are diagrams illustrating the main dimensions of two models of prosthesis according to the invention, but of different sizes.

La prothèse représentée sur les figures 1 à 5 est une prothèse de la hanche de type général bien connu comprenant une tige d'ancrage centro-médullaire 1, un col 2, et une portion tronconique 3. Celle-ci est conformée pour recevoir par emboîtement une tête sphérique non représentée, laquelle est destinée à s'engager dans une coupelle hémisphérique - ou cotyle - logée dans le bassin.  The prosthesis shown in FIGS. 1 to 5 is a hip prosthesis of the well-known general type comprising a centro-medullary anchoring rod 1, a neck 2, and a frustoconical portion 3. The latter is shaped to receive by interlocking a spherical head not shown, which is intended to engage in a hemispherical cup - or acetabulum - housed in the pelvis.

De manière connue, le col 2 est pourvu d'une petite cuvette 21 - ou trou d'impaction - destinée à recevoir un outil impacteur en vue de l'implantation de la prothèse dans un fémur. In known manner, the neck 2 is provided with a small bowl 21 - or impaction hole - intended to receive an impactor tool for the implantation of the prosthesis in a femur.

La tige 1 présente une forme générale allongée, d'axe
XX', qui s'effile progressivement depuis le col 2 vers l'extrémité distale. On a désigné par la référence Il la plus grande partie de la tige 1, qui correspond à la diaphyse du fémur. Comme on le voit à l'observation des figures 4 et 5, la section droite de la tige à ce niveau présente une forme générale rectangulaire à bords arrondis, aussi bien du côté externe (vers la gauche de la figure 1) que du côté interne (vers la droite de cette figure). Le grand axe de cette section rectangulaire correspond au plan frontal tandis que son petit axe correspond au plan sagittal. La tige 1 a donc une forme générale aplatie. Le grand côté de cette section, référencé a à la figure 4, a une dimension qui diminue assez rapidement de haut en bas (c'est-à-dire du côté distal) tandis que le petit côté b diminue également, mais très légèrement. Dans la zone d'extrémité distale, la section de la tige est approximativement circulaire (voir figure 5).
The rod 1 has a generally elongated shape, of axis
XX ', which tapers gradually from the neck 2 towards the distal end. The largest part of the stem 1 has been designated by the reference II, which corresponds to the diaphysis of the femur. As seen in the observation of Figures 4 and 5, the cross section of the rod at this level has a generally rectangular shape with rounded edges, both on the external side (to the left of Figure 1) and on the internal side (to the right of this figure). The major axis of this rectangular section corresponds to the frontal plane while its minor axis corresponds to the sagittal plane. The rod 1 therefore has a generally flattened shape. The long side of this section, referenced a in Figure 4, has a dimension which decreases fairly rapidly from top to bottom (that is to say on the distal side) while the small side b also decreases, but very slightly. In the distal end region, the cross section of the rod is approximately circular (see Figure 5).

Comme cela est bien connu, l'axe YY' des parties 2 et 3 forme avec l'axe XX' un angle w qui correspond à l'angulation naturelle de la hanche. Cet angle est généralement de l'ordre de 450.  As is well known, the axis YY 'of parts 2 and 3 forms with the axis XX' an angle w which corresponds to the natural angulation of the hip. This angle is generally of the order of 450.

On a désigné par la référence 10 la portion métaphysaire de la tige, portion qui relie la partie il à la base 20 du col 2. The metaphyseal portion of the stem has been designated by the reference 10, a portion which connects the part 11 to the base 20 of the neck 2.

Selon une caractéristique essentielle de l'invention, cette portion 10 possède des faces latérales planes 10a, 10b dont les plans convergent à la fois du côté interne de la prothèse et dans la direction distale, ceci de manière symétrique par rapport au plan frontal médian F de la prothèse. According to an essential characteristic of the invention, this portion 10 has flat lateral faces 10a, 10b, the planes of which converge both on the internal side of the prosthesis and in the distal direction, this symmetrically with respect to the median frontal plane F of the prosthesis.

Le plan F contient les axes XX' et YY' précités.  The plane F contains the above-mentioned axes XX 'and YY'.

La convergence des faces 10a et 10b du côté interne (vers la droite de la figure 1) est bien visible à la figure 3 où l'angle de convergence est désigné v. Cette convergence des faces 10a et lOb est due au fait que l'épaisseur e de la tige de prothèse est plus grande au voisinage du bord externe 10e que son épaisseur i au voisinage de son bord interne 10i. The convergence of the faces 10a and 10b on the internal side (to the right of FIG. 1) is clearly visible in FIG. 3 where the angle of convergence is designated v. This convergence of the faces 10a and 10b is due to the fact that the thickness e of the prosthesis rod is greater in the vicinity of the outer edge 10e than its thickness i in the vicinity of its inner edge 10i.

L'angle v est compris entre 5 et 100 ; il est de préférence de l'ordre de 7 à 80. The angle v is between 5 and 100; it is preferably of the order of 7 to 80.

A la figure 2, on observe la convergence des faces 10a et 10b vers l'extrémité distale, ces faces formant un angle dont le sommet est tourné vers le bas. L'angle u illustré sur cette figure
-e correspondant à l'angulation des faces 10a et lOb au voisinage du bord externe 10e ; l'angle u est compris entre 4 et 80 et est de préférence de l'ordre de 5 à 60.
In FIG. 2, the convergence of the faces 10a and 10b is observed towards the distal end, these faces forming an angle whose apex is facing downwards. The angle u illustrated in this figure
-e corresponding to the angulation of the faces 10a and 10b in the vicinity of the outer edge 10e; the angle u is between 4 and 80 and is preferably of the order of 5 to 60.

Bien entendu, au voisinage du bord interne 10i, l'angle au sommet des faces 10a et 10b est plus faible. Cet angle est compris entre 2 et 40, de préférence de l'ordre de 30. Of course, in the vicinity of the internal edge 10i, the angle at the top of the faces 10a and 10b is smaller. This angle is between 2 and 40, preferably of the order of 30.

La liaison entre les parties 10 et 11 se fait de manière douce, sans solution de continuité de surface. The connection between parts 10 and 11 is done smoothly, without any surface continuity solution.

Selon une autre caractéristique importante de l'invention, le rapport entre la longueur totale L de la tige 1 et la longueur 1 de la portion métaphysaire est de l'ordre de 3,5 environ. According to another important characteristic of the invention, the ratio between the total length L of the rod 1 and the length 1 of the metaphyseal portion is of the order of approximately 3.5.

La figure 6 permet de mieux comprendre l'orientation des deux plans contenant les faces latérales 10a, 10b. Sur cette figure on a représenté en perspective et en trait fort le contour îOc d'une section transversale de la portion 10. Les faces lOa et 10b, représentées partiellement sous forme de zones hachurées, sont contenues dans des plans qui convergent doublement du côté interne (point d'intersection P1) et du côté distal (point d'intersection
P2). Ces plans se coupent donc selon une droite D contenue dans le plan de symétrie frontal F et qui passe par P1 et P2.
Figure 6 provides a better understanding of the orientation of the two planes containing the side faces 10a, 10b. This figure shows in perspective and in strong lines the contour îOc of a cross section of the portion 10. The faces 10a and 10b, partially represented in the form of hatched areas, are contained in planes which converge doubly on the internal side. (point of intersection P1) and on the distal side (point of intersection
P2). These planes therefore intersect along a straight line D contained in the frontal plane of symmetry F and which passes through P1 and P2.

Sur les schémas des figures 7 et 8 sont représentées deux tiges de prothèses l'une (figure 7) de faible calibre et l'autre (figure 8) de fort calibre. In the diagrams of Figures 7 and 8 are shown two prosthesis rods one (Figure 7) of small caliber and the other (Figure 8) of large caliber.

Ces tiges sont vues de côté (vues analogues à la figure 2). On y a désigné par 10i les bords des faces 10a et lOb situés du côté interne et par 10e les bords de ces mêmes faces situés du côté externe. These rods are seen from the side (views similar to Figure 2). There are designated by 10i the edges of the faces 10a and 10b located on the internal side and by 10e the edges of these same faces located on the external side.

On a désigné par la lettre L la longueur de la tige, par 1 la longueur de la portion 10, par p l'épaisseur de la tige à son extrémité distale, par u son épaisseur à la jonction des parties 11 et 10, par i l'écartement mutuel des deux bords 10i et par e l'écartement mutuel des deux bords 10e. Ces références ont été assorties de l'indice 1 pour le petit calibre (figure 7) et de l'indice 2 pour le grand calibre (figure 8). The length of the rod is designated by the letter L, by 1 the length of the portion 10, by p the thickness of the rod at its distal end, by u its thickness at the junction of the parts 11 and 10, by i the mutual spacing of the two edges 10i and by e the mutual spacing of the two edges 10e. These references were accompanied by the index 1 for the small caliber (Figure 7) and the index 2 for the large caliber (Figure 8).

A simple titre indicatif on donnera ci-après les dimensions de ces différentes cotes
L1 = 130 mm ; L2 = 150 mm.
For information only, the dimensions of these different dimensions will be given below.
L1 = 130 mm; L2 = 150 mm.

11 = 37 mm ; 12 = 43 mm. 11 = 37 mm; 12 = 43 mm.

pl = 9 mm ; p2 = 12 mm. pl = 9 mm; p2 = 12 mm.

ul = 10 mm ; u2 = 13 mm. ul = 10 mm; u2 = 13 mm.

el = 14 mm ; e2 = 17 mm. el = 14 mm; e2 = 17 mm.

il = 12 mm ; i2 = 15 mm. il = 12 mm; i2 = 15 mm.

On obtient donc les valeurs suivantes L1 12 - = 3,51 ; - = 3,49. The following values are therefore obtained L1 12 - = 3.51; - = 3.49.

12 12
Ces deux valeurs sont voisines de 3,5.
12 12
These two values are close to 3.5.


Le calcul des angles u et u. conduit au résultat
C -1 suivant
u 1 = 6,20 ; u 2 = 5,40.

The calculation of the angles u and u. leads to the result
C -1 next
u 1 = 6.20; u 2 = 5.40.

-e -e
u;l = 3,20 ; ut2 = 2,80.
-e -e
u; l = 3.20; ut2 = 2.80.

L'expérience a montré que la forme et le dimensionnement particuliers de la portion métaphysaire 10 permettaient d'obtenir un ancrage efficace et durable, avec interposition d'une quantité extrêmement faible de ciment. Une telle configuration est en effet bien complémentaire de celle de son logement, c'est-à-dire de la configuration de la partie métaphysaire du canal centro-médullaire fémoral, que la portion 10 vient occuper complètement au cours de sa mise en place. Experience has shown that the particular shape and sizing of the metaphyseal portion 10 makes it possible to obtain an effective and durable anchoring, with the interposition of an extremely small quantity of cement. Such a configuration is indeed very complementary to that of its housing, that is to say of the configuration of the metaphyseal part of the femoral centro-medullary canal, which the portion 10 comes to occupy completely during its establishment.

La prothèse est même utilisable sans ciment dans de nombreuses circonstances. The prosthesis can even be used without cement in many circumstances.

En outre, grâce à sa forme symétrique par rapport au plan frontal, elle est réversible et peut être utilisée indifféremment du côté gauche ou du côté droit, ce qui est très intéressant sur le plan du prix de fabrication et de la commodité d'utilisation (stocks réduits). In addition, thanks to its symmetrical shape with respect to the frontal plane, it is reversible and can be used either on the left side or on the right side, which is very advantageous in terms of the manufacturing price and the convenience of use ( reduced stocks).

La prothèse peut être fabriquée en tout matériau approprié utilisé pour ce genre de produits, par exemple en acier inoxydable.  The prosthesis can be made of any suitable material used for this kind of product, for example stainless steel.

Claims (4)

REVENDICATIONS 1. Prothèse de la hanche, du type comportant une tige (1) de forme générale aplatie à bords arrondis destinée à être implantée dans le canal centro-médullaire d'un fémur, dont'la section transversale diminue progressivement de l'extrémité proximale vers l'extrémité distale, caractérisée par le fait que la portion métaphysaire (10) de cette tige (1) possède des faces latérales planes (10a, 10b), dont les plans convergent à la fois du côté interne de la prothèse et dans la direction distale, ceci de manière symétrique par rapport à un plan frontal médian (F). 1. Hip prosthesis, of the type comprising a rod (1) of generally flattened shape with rounded edges intended to be implanted in the medullary canal of a femur, the cross section of which gradually decreases from the proximal end towards the distal end, characterized in that the metaphyseal portion (10) of this rod (1) has planar lateral faces (10a, 10b), the planes of which converge both on the internal side of the prosthesis and in the direction distal, this symmetrically with respect to a median frontal plane (F). 2. Prothèse selon la revendication 1, caractérisée par le fait que lesdites faces latérales (10a, 10b) convergent du côté interne d'un angle (v) compris entre 5 et 100, de préférence de l'ordre de 7 à 80. 2. Prosthesis according to claim 1, characterized in that said lateral faces (10a, 10b) converge on the internal side by an angle (v) between 5 and 100, preferably of the order of 7 to 80. 3. Prothèse selon l'une des revendications 1 ou 2, caractérisée par le fait que lesdites faces latérales (10a, 10b) convergent dans la direction distale d'un angle (u) qui, au voisinage du bord externe (10e) est compris entre 4 et 80, et est de préférence de l'ordre de 60 et, au voisinage du bord interne (lOi) est compris entre 2 et 40, et est de préférence de l'ordre de 30. 3. Prosthesis according to one of claims 1 or 2, characterized in that said lateral faces (10a, 10b) converge in the distal direction by an angle (u) which, in the vicinity of the outer edge (10e) is included between 4 and 80, and is preferably of the order of 60 and, in the vicinity of the internal edge (lOi) is between 2 and 40, and is preferably of the order of 30. 4. Prothèse selon l'une des revendications 1 à 3, caractérisée par le fait que le rapport de la longueur totale (L) de la tige (1) et de la longueur (1) de ladite portion métaphysaire (10) est de 3,5 environ.  4. Prosthesis according to one of claims 1 to 3, characterized in that the ratio of the total length (L) of the rod (1) and the length (1) of said metaphyseal portion (10) is 3 , About 5.
FR9108650A 1991-07-04 1991-07-04 HIP PROSTHESIS. Expired - Lifetime FR2678509B3 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0974317A1 (en) * 1998-07-24 2000-01-26 BEJUI, Jacques Anchoring shaft for hip joint prosthesis and set of such shafts
EP1000594A1 (en) * 1998-11-13 2000-05-17 Bone & Joint Research S.A. Fixation stem for femoral head
FR2797762A1 (en) 1999-08-27 2001-03-02 Cottin Philippe Femoral implant for artificial hip joint has frustoconical projection which accommodates ball, standing on conical base and has curved tapered projection extending from shoulder
FR2844994A1 (en) * 2002-09-27 2004-04-02 Medacta Int Sa Hip joint prosthesis nail has defined angles between areas of shank and neck in two planes
US8206455B2 (en) 2005-02-22 2012-06-26 Zimmer Technology, Inc. Hip stem prosthesis
EP3016615A4 (en) * 2013-05-20 2017-04-12 Chitranjan S. Ranawat Femoral component for a hip prosthesis

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0974317A1 (en) * 1998-07-24 2000-01-26 BEJUI, Jacques Anchoring shaft for hip joint prosthesis and set of such shafts
FR2781365A1 (en) * 1998-07-24 2000-01-28 Jacques Bejui ANCHORING ROD FOR HIP JOINT PROSTHESIS AND SET OF SUCH RODS
EP1000594A1 (en) * 1998-11-13 2000-05-17 Bone & Joint Research S.A. Fixation stem for femoral head
FR2797762A1 (en) 1999-08-27 2001-03-02 Cottin Philippe Femoral implant for artificial hip joint has frustoconical projection which accommodates ball, standing on conical base and has curved tapered projection extending from shoulder
FR2844994A1 (en) * 2002-09-27 2004-04-02 Medacta Int Sa Hip joint prosthesis nail has defined angles between areas of shank and neck in two planes
US8206455B2 (en) 2005-02-22 2012-06-26 Zimmer Technology, Inc. Hip stem prosthesis
US8858646B2 (en) 2005-02-22 2014-10-14 Zimmer, Inc. Hip stem prosthesis
US9636227B2 (en) 2005-02-22 2017-05-02 Zimmer, Inc. Hip stem prosthesis
US10426623B2 (en) 2005-02-22 2019-10-01 Zimmer, Inc. Hip stem prosthesis
EP3016615A4 (en) * 2013-05-20 2017-04-12 Chitranjan S. Ranawat Femoral component for a hip prosthesis

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