EP2004098A2 - Implantat zur wiederherstellung der oberfläche eines oberschenkelhalskopfes - Google Patents

Implantat zur wiederherstellung der oberfläche eines oberschenkelhalskopfes

Info

Publication number
EP2004098A2
EP2004098A2 EP07731118A EP07731118A EP2004098A2 EP 2004098 A2 EP2004098 A2 EP 2004098A2 EP 07731118 A EP07731118 A EP 07731118A EP 07731118 A EP07731118 A EP 07731118A EP 2004098 A2 EP2004098 A2 EP 2004098A2
Authority
EP
European Patent Office
Prior art keywords
implant according
cap
femoral
axis
surfacing
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Withdrawn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
EP07731118A
Other languages
English (en)
French (fr)
Inventor
Michel Timoteo
Tarik Ait Si Selmi
Michel Bonnin
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
Publication of EP2004098A2 publication Critical patent/EP2004098A2/de
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/14—Surgical saws ; Accessories therefor
    • A61B17/15—Guides therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
    • A61B17/17—Guides or aligning means for drills, mills, pins or wires
    • A61B17/1739—Guides or aligning means for drills, mills, pins or wires specially adapted for particular parts of the body
    • A61B17/1742—Guides or aligning means for drills, mills, pins or wires specially adapted for particular parts of the body for the hip
    • A61B17/175—Guides or aligning means for drills, mills, pins or wires specially adapted for particular parts of the body for the hip for preparing the femur for hip prosthesis insertion
    • 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
    • A61F2/3601—Femoral heads ; Femoral endoprostheses for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices
    • A61F2/3603—Femoral heads ; Femoral endoprostheses for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices implanted without ablation of the whole natural femoral head
    • 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
    • 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
    • A61F2002/30159—Concave polygonal shapes
    • A61F2002/30172—T-shaped
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30317—The prosthesis having different structural features at different locations within the same prosthesis
    • A61F2002/30324—The prosthesis having different structural features at different locations within the same prosthesis differing in thickness
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
    • A61F2002/30616—Sets comprising a plurality of prosthetic parts of different sizes or orientations
    • 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
    • A61F2002/30772—Apertures or holes, e.g. of circular cross section
    • A61F2002/30784—Plurality of holes
    • A61F2002/30785—Plurality of holes parallel
    • 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
    • A61F2002/30772—Apertures or holes, e.g. of circular cross section
    • A61F2002/30784—Plurality of holes
    • A61F2002/30789—Plurality of holes perpendicular with respect to each other
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30879—Ribs
    • A61F2002/30883—Ribs dovetail-shaped
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30884—Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30899—Protrusions pierced with apertures
    • A61F2002/30902—Protrusions pierced with apertures laterally or radially
    • 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
    • A61F2230/0028—Shapes in the form of latin or greek characters
    • A61F2230/0052—T-shaped
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0036—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in thickness

Definitions

  • the present invention relates to a re-surfacing implant for repairing the external articular surface of the femoral head.
  • re-surfacing The surgical technique for repairing the external articular surface of the femoral head called "re-surfacing" is to replace the defective bone cartilage of the femoral head, a metal cap, hemispherical, hollow.
  • This femoral cap is usually associated with an equally hemispherical metallic acetabulum that is impacted in the acetabular cavity of the pelvis.
  • the current femoral caps have a generally cylindrical internal shape, forcing the surgeon to shape, using cutting tools, the femoral head spherical shape originally, in a cylindrical shape.
  • the superior cortex of the femoral neck may be damaged by the cutting tool, which may lead to fracture initiation.
  • the femoral head after being cut by the surgeon in a cylindrical shape, no longer has its hard or cortical bone layer and has a cylindrical stump consisting essentially of spongy bone of low resistance.
  • the profile of the hemispherical caps above imposes a unique positioning of said caps around the femoral head. This unique positioning is located on the axis of the femoral neck and may result in the possible tilting of the hemispherical cap by sagging of the bone support.
  • the purpose of the re-surfacing implant according to the present invention is to propose a solution to the problems posed above.
  • the re-surfacing implant according to the present invention consists of a femoral cap having an outer face, an inner face, a peripheral edge, a central axis XX 'passing through the pole P of said cap, an equatorial axis YY' perpendicular to the first and a point C of intersection between the main axes XX ', YY' forming the center of radius of curvature of said outer and inner faces of the guide means which consist of a cylindrical finger having a base coming to connect with the inner face at a point D which is shifted laterally relative to the pole P of the hemispherical profile of the femoral cap and stabilizing means which are arranged on the periphery of the inner face and having a profile which is disposed in a plane parallel to that containing the guide means.
  • the re-surfacing implant according to the present invention comprises essential features which are described and protected in claims 2-19.
  • Figures 1 to 5 are views showing a re-surfacing implant according to the present invention.
  • Figures 6 and 7 are views illustrating a first variant of the guide means and stabilizing means of the re-surfacing implant according to the present invention.
  • Figures 8 and 9 are views showing a second variant of the guide means and stabilizing means of the re-surfacing implant according to the present invention.
  • Figures 10 and 11 are views showing a third variant of the guide means and stabilizing means of the re-surfacing implant according to the present invention.
  • Figure 12 is a sectional view illustrating the placement of the resurfacing implant on the femoral head.
  • FIGS. 1 to 5 show a re-surfacing implant 1 according to the present invention comprising a femoral cap 2 which is intended to be fixed on the femoral head 3 of a femur 4, the external articular surface 5 of which is deteriorated.
  • the re-surfacing implant 1 consists of a set of femoral caps 2 to be able to adapt to the dimensions of the femoral head 3 to be repaired.
  • the femoral cap 2 consists of a thin wall 6 of constant thickness in the range having an outer sliding surface 7 with a substantially hemispherical profile and an inner face 8 with a partially hemispherical profile.
  • the femoral cap 2 has main axes consisting of a central axis XX 'passing through the pole P of said cap 2 and an equatorial axis YY' perpendicular to the first and intersecting the central axis XX 'at a point C forming the center of radius of curvature of the outer faces 7 and inner 8.
  • the outer sliding surface 7 has a sphericity which extends beyond the equatorial axis YY 'and to the peripheral edge 11 of the femoral cap 2. Also, the outer sliding surface 7 is mirror polished.
  • the thickness of the wall 6 must not be greater than that of the external articular surface 5 to be restored in order to preserve the maximum bone capital of the femoral head 3 as well as most of its rotundity.
  • the femoral cap 2 comprises, from its inner face 8, guiding means 9 which consist of a finger 90 with a cylindrical profile, which can be carried by an axis ZZ 'passing through the center C.
  • the axis ZZ 'of the cylindrical finger 90 can be arranged in a direction inclined at an angle ⁇ with respect to the central axis XX' of the femoral cap 2.
  • the cylindrical finger 90 comprises a base 91 which is connected to the internal face 8 at a point D carried by the axis ZZ 'and which is offset laterally with respect to the pole P of the hemispherical profile of the femoral cap 2.
  • the length of the cylindrical finger 90 is provided so as not to exceed the peripheral edge 11 of the femoral cap 2 in order to be completely contained within said cap.
  • the free end 92 of the cylindrical finger 90 located opposite the base 91, may be provided to not exceed the point C forming the center of radius of curvature of the outer faces 7 and inner 8 of the femoral cap 2.
  • the femoral cap 2 comprises stabilizing means 10 which are arranged around the periphery of the inner face 8 and having at least one profile which is arranged in a plane parallel to that containing the guiding means 90.
  • the inner face 8 of the cap Femoral 2 comprises stabilization means 10 which consist of a truncated profile obtained by at least one flat part 100, which is arranged in a plane parallel to that containing the cylindrical finger 90.
  • the stabilizing means 10 may comprise, in the middle of the flat 100 and in the same plane as that containing the cylindrical finger 90, at least one tapered rib 12 having, for example, a dovetail profile.
  • the flat 100 comprises a tapered rib 12 which extends from the inner face 8 of the femoral cap 2 and whose length is substantially half that of said flat 100.
  • the inner face 8 has an inner cylindrical face portion 13 arranged from the peripheral edge 11 of the femoral cap 2 to the level of the equatorial axis YY 'of said femoral cap 2. It can be seen that the wall 6 of the femoral cap 2 increases in thickness at the flat portion 100 formed in the extension of the inner face 8.
  • the inner face 8 is covered over its entire surface with an osteoconductive substrate.
  • FIGS. 6 to 7 show a first variant of the guide means 9 and the stabilization means 10 of the re-surfacing implant 1 according to the present invention.
  • the femoral cap 2 of the re-surfacing implant 1 is similar to that described above in FIGS. 1 to 5 and comprises only modifications with regard to the guiding means 9 and the stabilizing means 10.
  • the femoral cap 2 comprises from its inner face 8 guiding means 9 which consist of a finger 90 cylindrical profile, which can be carried by an axis ZZ 'passing through the center C.
  • L' ZZ 'axis of the cylindrical finger 90 may be arranged in a direction inclined at an angle ⁇ with respect to the central axis XX' of the femoral cap 2.
  • the cylindrical finger 90 comprises a base 91 coming to connect with the inner face 8 at a point D carried by the axis ZZ 'and which is offset laterally with respect to the pole P of the external hemispherical profile of the femoral cap 2.
  • the length of the cylindrical finger 90 is provided so as not to exceed the peripheral edge 11 of the femoral cap 2 in order to be completely contained within said cap.
  • the free end 92 of the cylindrical finger 90 located opposite the base 91, may be provided to not exceed the point C forming the center of radius of curvature of the outer faces 7 and inner 8 of the femoral cap 2.
  • the cylindrical finger 90 has from its free end 92 and towards the inner face 8 of the femoral cap 2 an inclined pan 93 for producing a tapered profile of said cylindrical finger.
  • the inclined face 93 may be arranged in a plane parallel to that containing the main axis XX 'passing between the point C and the pole P of the femoral cap 2.
  • the femoral cap 2 comprises stabilizing means 10 which are arranged around the periphery of the inner face 8 and having at least one profile which is arranged in a plane parallel to that containing the guide means 9.
  • the inner face 8 of the femoral cap 2 comprises stabilization means 10 which consist of a truncated profile obtained by at least one flat part 100, which is arranged in a plane parallel to that containing the cylindrical finger 90. It should be noted in this case that the flat part 100 does not include any means of bone anchoring as described in FIGS. 1 to 5.
  • the internal face 8 has an inner cylindrical face portion 13 arranged from the peripheral edge 11 of the femoral cap 2 until 'at the equatorial axis YY' of said femoral cap 2.
  • the peripheral edge 11 has, for example, opposite the flat 100 an inclined sector 110 whose lowest part is either on the equatorial axis YY ', or slightly below.
  • FIGS. 8 to 9 show a second variant of the guide means 9 and the stabilization means 10 of the re-surfacing implant 1 according to the present invention.
  • the femoral cap 2 of the re-surfacing implant 1 is similar to that described above in FIGS. 1 to 5 and comprises only modifications with regard to the guiding means 9 and the stabilizing means 10.
  • the femoral cap 2 comprises from its inner face 8 guide means 9 which consist of a finger 90 cylindrical profile, which can be carried by an axis AA 'laterally offset from the axis XX ', but arranged in a plane parallel to that containing the main axis XX' passing between the point C and the pole P of the femoral cap 2.
  • the cylindrical finger 90 comprises a base 91 coming to connect with the inner face 8 at a point D carried by the axis AA 'and which is offset laterally with respect to the pole P of the outer hemispherical profile of the femoral cap 2.
  • the length of the cylindrical finger 90 is provided so as not to exceed the peripheral edge 11 of the femoral cap 2 in order to be completely contained within said cap.
  • the free end 92 of the cylindrical finger 90 located opposite the base 91, may be located between the peripheral edge 11 of the femoral cap 2 and the equatorial axis YY '.
  • the cylindrical finger 90 is pierced with at least one through hole 94 passing right through the thickness of said finger to form a zone facilitating bone rehabilitation.
  • the through holes 94 are on the one hand carried by the axis AA 'and on the other hand formed between the equatorial axis YY' and the internal face 8 of the femoral cap 2.
  • the femoral cap 2 comprises stabilizing means 10 which are arranged around the periphery of the inner face 8 so that the means of 21
  • the stabilizing means 10 consist of at least one fin 101 extending from the inner face 8 and towards the main axis XX 'of the femoral cap 2.
  • Each fin 101 consists of a thin wall anchored in the bony part of the femoral head 3 to stabilize and prevent rotation of the femoral cap around the cylindrical finger 90.
  • Each fin 101 is pierced with through holes 102 passing right through the thickness of the wall to form an area facilitating bone rehabilitation.
  • the inner face 8 has an inner cylindrical face portion 13 arranged from the peripheral edge 11 of the femoral cap 2 to the level of the equatorial axis YY 'of said femoral cap 2.
  • the peripheral edge 11 has, for example, the opposite of the stabilization means 10, an inclined sector 110 whose lowest part is on the equatorial axis YY ', or slightly below the latter.
  • FIGS. 10 and 11 show a third variant of the femoral cap 2 and more particularly stabilizing means 10 for the re-surfacing implant 1 according to the present invention, knowing that the guiding means 9 are similar to those described previously.
  • the stabilizing means 10 consist of at least one fin 103 having a profile with three branches.
  • the fin 103 comprises a first branch 104 extending from the inner face 8 and towards the main axis XX 'of the femoral cap 2 and two other branches 105, 108 arranged in a direction which is perpendicular to that of the first branch so as to have, for example, a T-shaped profile
  • branches 105, 108 may be arranged in a plane which is parallel to that containing the main axis XX 'of the femoral cap 2.
  • Each branch 104, 105 and 108 of the fin 103 consists of a thin wall anchored in the bony part of the femoral head 3 in order to stabilize and prevent any rotation of the femoral cap around the finger cylindrical 90.
  • FIG. 12 shows a femoral cap 2 which is positioned around the femoral head 3 so that on the one hand the cylindrical finger 90 penetrates inside a blind hole 30 and on the other hand the flat 100 cooperates with the flat face 31 obtained after cutting the external articular surface 5.
  • the surgeon proceeds with the aid of an ancillary, not shown, to the section of the external articular surface 5 of the femoral head 3 and has an adequate femoral cap 2 which is from a game or a range of cap.
  • cylindrical finger 90 is introduced into the blind hole 30 of the femoral head 3 before the tapered rib 12 comes into contact with the edge of the articular surface 5. Then the surgeon exerts a pressure force on the femoral cap 2 so that the latter comes to impact in the femoral head 3 and cover the outer articular surface 5.
  • the tapered rib 12 penetrates into the thickness of the femoral head 3, close to the flat surface 31 made during the cutting of the external articular surface 5 to form an anchor and immobilization in rotation around the cylindrical finger of said femoral cap 2.
  • the cylindrical finger 90 of the femoral cap 2 ensures, during its introduction into the blind hole 30, mainly the guide of the latter during its phase of setting in place to obtain the most appropriate positioning possible.
  • the flat part 100 formed inside the femoral cap 2 bearing against the flat face 31 of the femoral head 3 prevents the tilting of said cap on the rotundity of said femoral head.
  • This setting up is an example and remains particular to that of the femoral cap 2 described in FIGS. 1 to 5.
  • the establishment of the femoral cap 2 may be different depending on the structure of the guide means 9 and stabilization means 10 retained.
  • each variant described above remains an exemplary embodiment of a femoral cap 2 knowing that the combinations between the guide means 9 and the stabilizing means 10 as proposed are not limiting and can be modified without thereby changing the object of the present invention.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Veterinary Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Molecular Biology (AREA)
  • Medical Informatics (AREA)
  • Dentistry (AREA)
  • Cardiology (AREA)
  • Transplantation (AREA)
  • Vascular Medicine (AREA)
  • Prostheses (AREA)
EP07731118A 2006-03-10 2007-03-09 Implantat zur wiederherstellung der oberfläche eines oberschenkelhalskopfes Withdrawn EP2004098A2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0602126A FR2898267B1 (fr) 2006-03-10 2006-03-10 Implant de re-surfacage de tete femorale et son ancillaire.
US81294806P 2006-06-13 2006-06-13
PCT/FR2007/000421 WO2007104852A2 (fr) 2006-03-10 2007-03-09 Implant de re-surfacage de tete femorale

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EP2004098A2 true EP2004098A2 (de) 2008-12-24

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US (1) US20090306788A1 (de)
EP (1) EP2004098A2 (de)
AU (1) AU2007226442A1 (de)
FR (1) FR2898267B1 (de)
WO (1) WO2007104852A2 (de)

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GB0207170D0 (en) * 2002-03-26 2002-05-08 Mcminn Derek J W Hip joint prosthesis
US8105327B2 (en) 2003-03-31 2012-01-31 Depuy Products, Inc. Punch, implant and associated method
US8366713B2 (en) 2003-03-31 2013-02-05 Depuy Products, Inc. Arthroplasty instruments and associated method
US8545506B2 (en) * 2003-03-31 2013-10-01 DePuy Synthes Products, LLC Cutting guide for use with an extended articulation orthopaedic implant
US7517364B2 (en) 2003-03-31 2009-04-14 Depuy Products, Inc. Extended articulation orthopaedic implant and associated method
US7879042B2 (en) 2004-03-05 2011-02-01 Depuy Products, Inc. Surface replacement extractor device and associated method
GB0820219D0 (en) * 2008-11-05 2008-12-10 Imp Innovations Ltd Hip resurfacing
FR2967047B1 (fr) 2010-11-05 2013-09-20 Aston Medical Gabarit de pose d'une prothese d'epaule sur une glene
US9492184B2 (en) * 2013-08-05 2016-11-15 William B. Kurtz Hip replacement systems and methods
WO2016005236A1 (de) * 2014-07-09 2016-01-14 Ceramtec Gmbh Vollkeramische oberflächenersatzprothese mit poröser innenseite
CN104887354B (zh) 2015-02-10 2017-06-30 江苏奥康尼医疗科技发展有限公司 一种组合式有机高分子材料人工膝关节
CN105030376B (zh) * 2015-02-10 2017-02-01 江苏奥康尼医疗科技发展有限公司 一种全髋表面置换植入物
GB2568047B (en) * 2017-11-01 2021-10-27 Matortho Ltd Improvements in or relating to ceramic femoral resurfacing head prosthesis
US20220047394A1 (en) * 2017-11-01 2022-02-17 Matortho Limited Improvements in or relating to ceramic femoral resurfacing head prosthesis

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Also Published As

Publication number Publication date
US20090306788A1 (en) 2009-12-10
AU2007226442A1 (en) 2007-09-20
WO2007104852A2 (fr) 2007-09-20
FR2898267B1 (fr) 2008-12-26
FR2898267A1 (fr) 2007-09-14
WO2007104852A3 (fr) 2007-11-15

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