FR2800600A1 - Femoral prosthesis shank has asymmetrical cross-section in metaphysis zone to wedge in place without cement - Google Patents

Femoral prosthesis shank has asymmetrical cross-section in metaphysis zone to wedge in place without cement Download PDF

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Publication number
FR2800600A1
FR2800600A1 FR9914407A FR9914407A FR2800600A1 FR 2800600 A1 FR2800600 A1 FR 2800600A1 FR 9914407 A FR9914407 A FR 9914407A FR 9914407 A FR9914407 A FR 9914407A FR 2800600 A1 FR2800600 A1 FR 2800600A1
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France
Prior art keywords
face
section
femoral stem
segment
posterior
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Granted
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FR9914407A
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French (fr)
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FR2800600B1 (en
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Bertrand Bouxin
Didier Capon
Denis Chambaud
Alain Lucet
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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
    • 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
    • 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
    • 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
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • 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
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A61F2002/30125—Rounded shapes, e.g. with rounded corners elliptical or oval
    • 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
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30138—Convex polygonal shapes
    • 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
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30138—Convex polygonal shapes
    • A61F2002/30158—Convex polygonal shapes trapezoidal
    • 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
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3625—Necks
    • 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
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/365—Connections of heads to necks
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004—Rounded shapes, e.g. with rounded corners
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004—Rounded shapes, e.g. with rounded corners
    • A61F2230/0008—Rounded shapes, e.g. with rounded corners elliptical or oval
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0017—Angular shapes
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0017—Angular shapes
    • A61F2230/0026—Angular shapes trapezoidal

Abstract

The anterior (1c) and posterior (1d) faces of the shank are asymmetrical in the metaphysis zone of the femoral prosthesis, the former having a straight profile, while the latter is curved. The two profiles are connected to the inner (1f) and outer (1e) faces of the shank by rounded corners, giving the cross-sectional an anatomical shape which ensures that the shank locks in position without the need for cement. The anterior face is made from two flat sections (a, b), the first being shorter and lying parallel to the long axis of the cross-section, and the second converging with the axis. The posterior face has a segment with a convex radius of curvature (c) with its centre offset in the direction of the outer face (1e) to give a degressive section in the direction of the inner face.

Description

L'invention se rattache au secteur technique des implants chirurgicaux, notamment des tiges fémorales destinées à être impactées dans le canal médullaire d'un fémur. The invention relates to the technical sector of surgical implants, including femoral stems intended to be impacted in the medullary canal of a femur.

La partie de la tige destinée à être impactée dans le canal médullaire est prolongée angulairement par un col dont l'extrémité libre est agencé pour recevoir, directement ou d'une manière rapportée, une tête sphérique généralement dénommée "tête fémorale". La tête coopère avec une partie complémentaire d'un implant cotyloïdien impacté dans la cavité correspondante de l'os iliaque. On connaît une très grande variété tiges fémorales. The portion of the rod intended to be impacted in the medullary canal is extended angularly by a neck whose free end is arranged to receive, directly or in a reported manner, a spherical head generally referred to as "femoral head". The head cooperates with a complementary portion of an acetabular implant impacted in the corresponding cavity of the pelvic bone. A very large variety of femoral stems is known.

Notamment, il convient de distinguer celles qui sont retenues dans le canal médullaire avec du ciment, et celles présentant un profil des agencements spécifiques évitant l'emploi d'un tel ciment. In particular, it is necessary to distinguish those retained in the medullary canal with cement, and those having a profile of specific arrangements avoiding the use of such cement.

Comme indiqué, l'invention concerne plus particulièrement tige fémorale destinée à être impactée sans ciment. As indicated, the invention relates more particularly to the femoral stem intended to be impacted without cement.

Parmi ces types de tiges fémorales non cimentées, on distingue les tiges du type anatomique et les tiges du type autobloquante. Les tiges anatomiques assurent un meilleur remplissage métaphysaire au détriment parfois de leur stabilité étant donné qu'elles respectent les courbures fémorales en évitant tout "effet coin". A l'inverse, une section autobloquante offre une meilleure stabilité avec cependant des contacts plus localisés et des risques de conflit avec la corticale antérieure qui est dissymétrique par rapport à corticale postérieure, conflit pouvant provoquer une fragilisation, voire une fracture osseuse. Among these types of uncemented femoral stems, there are anatomical type stems and self-locking type stems. The anatomical stems provide a better metaphyseal filling, sometimes to the detriment of their stability, since they respect the femoral curvatures while avoiding any "wedge effect". Conversely, a self-locking section offers better stability with, however, more localized contacts and the risk of conflict with the anterior cortex that is dissymmetrical with respect to the posterior cortical bone, a conflict that can cause embrittlement or even bone fracture.

L'invention s'est fixée pour but de remédier à ces inconvénients, de manière simple, sûre, efficace et rationnelle. The object of the invention is to remedy these disadvantages in a simple, safe, effective and rational manner.

A partie de cet état de la technique, le problème que se propose de résoudre l'invention est de réaliser une tige fémorale dont section, au niveau métaphysaire notamment, soit à la fois du type anatomique et du type autobloquant, afin d'obtenir un remplissage métaphysaire optimal et une parfaite stabilité. From this state of the art, the problem to be solved by the invention is to provide a femoral stem whose section, at the metaphyseal level in particular, is both of the anatomical type and the self-locking type, in order to obtain a optimal metaphyseal filling and perfect stability.

Pour résoudre un tel problème, il a été conçu et mis au point une tige fémorale sans ciment qui présente, au niveau métaphysaire, une section transversale asymétrique entre les faces antérieure et postérieure, la face antérieure présentant un profil du type rectiligne, tandis la face postérieure présente un profil du type arrondi, lesdits profils étant raccordés aux faces interne et externe par des angles émoussés, de sorte ladite section transversale est du type anatomique avec effet autobloquant. To solve such a problem, it was designed and developed a cementless femoral stem that has, at the metaphyseal level, an asymmetrical cross section between the anterior and posterior surfaces, the anterior face having a rectilinear type profile, while the face posterior has a profile of the rounded type, said profiles being connected to the inner and outer faces by blunt angles, so that said cross section is of the anatomical type with self-locking effect.

Pour résoudre le problème posé d'obtenir une parfaite stabilité, la face antérieure est composée de deux segments rectilignes, le segment situé du côté de la face externe est orienté d'une manière sensiblement parallèle au grand axe -(le la section, tandis que l'autre segment situé du côté de la face interne est orienté angulairement, d'une manière convergente, en direction de ladite face interne. Le segment rectiligne situé du côté de la face externe, est de longueur réduite par rapport au segment situé du coté de la face interne. To solve the problem of obtaining perfect stability, the front face is composed of two rectilinear segments, the segment located on the side of the outer face is oriented in a manner substantially parallel to the major axis - (the section, while the other segment located on the side of the inner face is oriented angularly, in a convergent manner, in the direction of said inner face, the rectilinear segment situated on the side of the outer face, is of reduced length relative to the segment located on the side of the inner face.

Pour résoudre le problème posé de respecter la dissymétrie de la corticale postérieure, la face postérieure présente un rayon de courbure convexe, dont le centre est décalé du côté de la face externe pour créer une section dégressive en direction de la face interne. To solve the problem of respecting the dissymmetry of the posterior cortex, the posterior face has a convex radius of curvature, whose center is offset on the side of the outer face to create a degressive section towards the inner face.

Pour résoudre le problème posé d'obtenir un effet autobloquant, les segments courbe et rectiligne sont raccordés à la face externe qui est plane, par deux rayons identiques. To solve the problem of obtaining a self-locking effect, the curved and rectilinear segments are connected to the external face which is flat, by two identical rays.

Pour résoudre le problème posé de respecter l'anatomie les segments courbe et rectiligne sont raccordés à la face interne par deux rayons identiques. To solve the problem of respecting the anatomy, the curved and rectilinear segments are connected to the internal face by two identical rays.

Pour conjuguer un profil en section transversale à la fois autobloquant et anatomique, les rayons de raccordement avec la face interne sont de longueur supérieure à celle des rayons de raccordement avec la face externe. In order to combine a cross-sectional profile that is both self-locking and anatomical, the connecting radii with the internal face are longer than those of the connecting radii with the external face.

Selon une autre caractéristique, la section métaphysaire se transforme progressivement en direction de l'extrémité distale de la tige, en section elliptique. According to another characteristic, the metaphyseal section is progressively transformed towards the distal end of the stem, in elliptical section.

L'invention est exposée ci-après plus en détail à l'aide des figures des dessins annexés dans lesquels - la figure 1 est une vue de face de la tige fémorale selon l'invention ; - la figure 2 est une vue externe correspondant à la figure 1 - figure 3 est, à une échelle plus importante, une vue en coupe transversale de la tige fémorale considérée au niveau de partie métaphysaire ; - figure 4 est une vue correspondant à la figure 3 montrant la position la tige dans le canal médullaire au niveau de la résection cervicale. The invention is described below in more detail with the help of the figures of the accompanying drawings in which - Figure 1 is a front view of the femoral stem according to the invention; - Figure 2 is an external view corresponding to Figure 1 - Figure 3 is, on a larger scale, a cross-sectional view of the femoral stem considered at the metaphyseal portion; - Figure 4 is a view corresponding to Figure 3 showing the position of the rod in the medullary canal at the cervical resection.

tige fémorale désignée dans son ensemble par (1) présente un corps<B>(l</B>a) destiné à être impacté dans le canal médullaire, le corps<B>(l</B>a) étant prolongé latéralement et angulairement par un col fémoral (lb). L'extrémité du col présente des agencements pour recevoir une tête fémorale coopérant généralement avec un implant cotyloïdien impacté dans la cavité correspondante d'un os iliaque. On désigne par (1 c) la face antérieure, (1 d) la face posteneure, <B>(l</B>e) la face externe et<B>(If)</B> la face interne. femoral stem generally designated by (1) has a body <B> (1 </ B> a) to be impacted into the medullary canal, the body <B> (1 </ b> a) being extended laterally and angularly by a femoral neck (lb). The end of the neck has arrangements for receiving a femoral head generally cooperating with an impacted cotyloid implant in the corresponding cavity of an iliac bone. We denote by (1 c) the anterior face, (1 d) the posterior face, <B> (l </ B> e) the external face and <B> (If) </ B> the internal face.

Selon une caractéristique à la base de l'invention, la partie métaphysaire de la tige (1) présente une section transversale dont le profil est déterminé pour être à la fois du type anatomique et autobloquant. Dans ce but, section transversale métaphysaire est asymétrique entre les faces antérieure (1 c) et postérieure (1 d). According to a characteristic underlying the invention, the metaphyseal portion of the rod (1) has a cross section whose profile is determined to be both of the anatomical and self-locking type. For this purpose, metaphyseal cross section is asymmetrical between the anterior (1c) and posterior (1d) faces.

Ainsi, la tace antérieure (1c) présente un profil du type rectiligne, tandis que la face postérieure (1 d) présente un profil du type arrondi. Les faces antérieure (1c) et postérieure (1 d) sont raccordées aux faces interne <B>(If)</B> et externe (le) qui sont sensiblement parallèles, par des angles émoussés pour créer un effet autobloquant tout en respectant l'anatomie, comme il sera indiqué dans la suite de la description. Thus, the anterior tace (1c) has a profile of the rectilinear type, while the posterior face (1d) has a profile of the rounded type. The anterior (1c) and posterior (1d) faces are connected to the inner <B> (If) </ B> and outer (Ie) faces which are substantially parallel, by blunt angles to create a self-locking effect while respecting the anatomy, as will be indicated in the following description.

La face antérieure (le) est composée de deux segments rectilignes (a) (b). Le segment (a), situé du côté de la face externe (le), est orienté sensiblement parallèle au grand axe de la section de la tige (1). L'autre segment (b) est formé dans le prolongement du segment (a) en étant orienté angulairement, d'une manière convergente, en direction de la face interne f). Le segment (a) est de longueur réduite par rapport au segment (b). The anterior face (the) is composed of two rectilinear segments (a) (b). The segment (a), located on the side of the outer face (1c), is oriented substantially parallel to the major axis of the section of the rod (1). The other segment (b) is formed in the extension of the segment (a) being oriented angularly, in a convergent manner, towards the inner face f). Segment (a) is of reduced length relative to segment (b).

La face postérieure (1 d) est constituée par un segment courbe (c) dont le rayon de courbure est convexe et dont le centre (o) est décalé du coté de la face externe (le) par rapport à l'axe de symétrie transversal. Ce décalage a pour effet de créer une section dégressive en direction de la face interne (figure 3). The posterior face (1 d) is constituted by a curved segment (c) whose radius of curvature is convex and whose center (o) is offset on the side of the outer face (1c) with respect to the axis of transverse symmetry . This offset has the effect of creating a degressive section towards the inner face (Figure 3).

Les segments courbe (c) et rectilignes (a et b) sont raccordés à la face externe (le) par deux angles rayonnés (d) et (e). Les deux angles rayonnés et (e) sont identiques en ayant le même rayon. face externe est constituée par un segment rectiligne (f). Les segments courbes (le) et rectilignes (a) et (b) sont raccordés à la face interne f) par des angles rayonnés (g) et (h) identiques et de même rayon de courbure. Les rayons de courbure de raccordement (g) et (h) sont supérieurs a ceux (d) et (e) raccordant la face externe (le). On renvoie à la figure 3 qui donne, à titre indicatif, les valeurs numériques considérées comme optimales de la section métaphysaire d'une tige côté droit de taille 40. Sur cette figure, apparaissent notamment la différence de valeur des rayons (g ) et (h) et des rayons (d) et (e), le décalage du centre (o) du segment courbe (c) et la pente du segment rectiligne (b). The curved (c) and rectilinear (a and b) segments are connected to the outer face (1c) by two radiated angles (d) and (e). The two radiated angles and (e) are identical having the same radius. outer face is constituted by a rectilinear segment (f). The curved (le) and rectilinear (a) and (b) segments are connected to the inner face f) by identical radiated angles (g) and (h) with the same radius of curvature. The connecting radius of curvature (g) and (h) are greater than those (d) and (e) connecting the outer face (1c). Referring to FIG. 3, which gives, as an indication, the numerical values considered optimal of the metaphyseal section of a right-sided rod of size 40. In this figure, the difference in value of the radii (g) and ( h) and rays (d) and (e), the shift of the center (o) of the curved segment (c) and the slope of the rectilinear segment (b).

Du côté de la face externe, les angles rayonnés et (e) créent un effet autobloquant, tandis que du côté de la face interne les deux angles rayonnés (g) et (h) sont raccordés par un segment rectiligne (i) de longueur réduite constituant la face interne de profil anatomique. Comme le montre la figure 4, la face antérieure assure un effet autobloquant tandis que la face postérieure remplit l'espace spongieux plus large à ce niveau postérieur de section osseuse. On the side of the outer face, the radiated angles and (e) create a self-locking effect, while on the inner face side the two radiated angles (g) and (h) are connected by a straight segment (i) of reduced length constituting the internal face of anatomical profile. As shown in Figure 4, the anterior surface provides a self-locking effect while the posterior face fills the spongy space wider at this posterior level of bone section.

De plus, la section métaphysaire (A) telle définie selon les caractéristiques de l'invention se raccorde progressivement en direction de l'extrémité distale de la tige, en section elliptique. In addition, the metaphyseal section (A) as defined according to the features of the invention is gradually connected towards the distal end of the rod, in elliptical section.

Les avantages ressortent bien de la description.The advantages are apparent from the description.

Claims (1)

REVENDICATIONS -1- Tige fémorale sans ciment pour prothèse de hanche, caractérisée en ce qu'elle présente, au niveau métaphysaire, une section transversale asymétrique entre les faces antérieure (1 c) et postérieure (1 d), la face antérieure (le) présentant un profil du type rectiligne, tandis que la face postérieure (1 d) présente un profil du type arrondi, lesdits profils étant raccordés aux faces interne <B>(If)</B> et externe (le) par des angles rayonnés, de sorte ladite section transversale est du type anatomique avec effet autobloquant. -2- Tige fémorale selon la revendication 1, caractérisée en ce que la face antérieure (1c) est composée de deux segments rectilignes (a) et (b), le segment situé du côté de la face externe (le) est orientée sensiblement parallèle grand axe de la section, tandis que l'autre segment (b), situé du côté de face interne (l@, est orienté angulairement, d'une manière convergente, en direction de ladite face interne. -3- Tige fémorale selon la revendication 2, caractérisée en ce que le segment rectiligne (a) situé du côté de la face externe (le), de longueur réduite rapport au segment (b) situé du côté de la face interne<B>(If).</B> -4- Tige fémorale selon la revendication 1, caractérisée en que la face postérieure présente un segment (1 d) de rayon de courbure convexe (c) dont le centre est décalé du côté de la face externe (le) pour creer une section dégressive en direction de la face interne (1 f). -5- Tige fémorale selon l'une quelconque des revendications 1, 3 et 4, caractérises en ce que les segments courbe et rectiligne sont raccordés à la face externe qui est plane, par deux rayons identiques (d) et (e). -6- Tige fémorale selon l'une quelconque des revendications 1, 3 et 4, caractérises en ce que les segments courbe et rectilignes sont raccordés à la face interne par deux rayons identiques (g) et (h). -7- Tige fémorale selon les revendications 5 et 6, caractérisée en ce que les rayons de raccordement (g) et (h) avec la face interne, sont supérieurs à ceux (d) (e) raccordant la face externe. -8- Tige fémorale selon la revendication 1, caractérisée en ce que la section métaphysaire se transforme progressivement en direction de l'extrémité distale ladite tige, en section elliptique.CLAIMS -1- Femoral stem without cement for hip prosthesis, characterized in that it has, at the metaphyseal level, an asymmetrical cross section between the anterior (1 c) and posterior (1 d), the anterior (the) having a profile of the rectilinear type, while the posterior face (1 d) has a profile of the rounded type, said profiles being connected to the internal faces <B> (If) </ B> and external (the) by radiated angles, so that said cross section is of the anatomical type with self-locking effect. Femoral stem according to Claim 1, characterized in that the anterior face (1c) is composed of two rectilinear segments (a) and (b), the segment situated on the side of the outer face (1c) is oriented substantially parallel. long axis of the section, while the other segment (b), located on the inner face side (1 @, is oriented angularly, in a convergent manner, towards said inner face .- 3- femoral stem according to the claim 2, characterized in that the rectilinear segment (a) located on the side of the outer face (1c), of reduced length relative to the segment (b) located on the side of the inner face <B> (If). </ B 4. Femoral stem according to claim 1, characterized in that the posterior face has a segment (1 d) of convex radius of curvature (c) whose center is offset on the side of the outer face (1c) to create a section. degressive in the direction of the inner face (1 f) -5- Femoral stem according to any of the Claims 1, 3 and 4, characterized in that the curved and rectilinear segments are connected to the outer face which is plane, by two identical radii (d) and (e). Femoral stem according to any one of claims 1, 3 and 4, characterized in that the curved and rectilinear segments are connected to the inner face by two identical radii (g) and (h). -7- Femoral stem according to claims 5 and 6, characterized in that the connecting radii (g) and (h) with the inner face, are greater than those (d) (e) connecting the outer face. Femoral stem according to claim 1, characterized in that the metaphyseal section is progressively transformed towards the distal end of said stem, in elliptical section.
FR9914407A 1999-11-10 1999-11-10 CEMENT-FREE FEMALE ROD FOR HIP PROSTHESIS Expired - Lifetime FR2800600B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2815536A1 (en) * 2000-10-25 2002-04-26 Marc Anzalone Cemented femoral implant shank has upper end shaped to form centering plug to prevent any escape of cement
FR2846874A1 (en) * 2002-11-13 2004-05-14 Euros Sa Hip prosthesis comprises body extending along vertical axis constituted by stack of horizontal sections, shoulder and rear bulge forming support points located under small trochanter when prosthesis is in femur
FR2946860A1 (en) * 2009-06-22 2010-12-24 Amplitude Femoral revision rod for hip prosthesis, has metaphyseal portion including trapezoidal section provided with angular apexes, where metaphyseal portion is not symmetric with respect to median plane passing through axis of neck portion

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0241846A1 (en) * 1986-04-15 1987-10-21 New York Society For The Relief Of The Ruptured And Crippled Maintaining The Hospital For Special Surgery Femoral prosthesis for total hip replacement
FR2639821A1 (en) * 1988-12-07 1990-06-08 Implants Instr Ch Fab Femoral element for a hip prosthesis
EP0499480A1 (en) * 1991-02-15 1992-08-19 Aesculap Limited Hip implants
DE4221442A1 (en) * 1992-06-30 1994-01-05 Keramed Medizintechnik Gmbh Metal stem for cemented hip joint prosthesis - has cross-section corresp. in its distal portion to femur cavity prepared by basting
EP0587955A1 (en) * 1992-09-15 1994-03-23 Michel Choteau Hip prosthesis
EP0720839A1 (en) * 1995-01-03 1996-07-10 Tornier Sa Femoral shaft with twisted profile for hip prosthesis

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0241846A1 (en) * 1986-04-15 1987-10-21 New York Society For The Relief Of The Ruptured And Crippled Maintaining The Hospital For Special Surgery Femoral prosthesis for total hip replacement
FR2639821A1 (en) * 1988-12-07 1990-06-08 Implants Instr Ch Fab Femoral element for a hip prosthesis
EP0499480A1 (en) * 1991-02-15 1992-08-19 Aesculap Limited Hip implants
DE4221442A1 (en) * 1992-06-30 1994-01-05 Keramed Medizintechnik Gmbh Metal stem for cemented hip joint prosthesis - has cross-section corresp. in its distal portion to femur cavity prepared by basting
EP0587955A1 (en) * 1992-09-15 1994-03-23 Michel Choteau Hip prosthesis
EP0720839A1 (en) * 1995-01-03 1996-07-10 Tornier Sa Femoral shaft with twisted profile for hip prosthesis

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2815536A1 (en) * 2000-10-25 2002-04-26 Marc Anzalone Cemented femoral implant shank has upper end shaped to form centering plug to prevent any escape of cement
FR2846874A1 (en) * 2002-11-13 2004-05-14 Euros Sa Hip prosthesis comprises body extending along vertical axis constituted by stack of horizontal sections, shoulder and rear bulge forming support points located under small trochanter when prosthesis is in femur
WO2004045469A1 (en) * 2002-11-13 2004-06-03 Euros S.A. Hip prosthesis
FR2946860A1 (en) * 2009-06-22 2010-12-24 Amplitude Femoral revision rod for hip prosthesis, has metaphyseal portion including trapezoidal section provided with angular apexes, where metaphyseal portion is not symmetric with respect to median plane passing through axis of neck portion

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