GB2347864A - Attachment for an acetabular cup in a dysplastic acetabulum - Google Patents

Attachment for an acetabular cup in a dysplastic acetabulum Download PDF

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Publication number
GB2347864A
GB2347864A GB9927424A GB9927424A GB2347864A GB 2347864 A GB2347864 A GB 2347864A GB 9927424 A GB9927424 A GB 9927424A GB 9927424 A GB9927424 A GB 9927424A GB 2347864 A GB2347864 A GB 2347864A
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United Kingdom
Prior art keywords
attachment
dysplasia
acetabular cup
acetabulum
cup
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
GB9927424A
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GB2347864B (en
GB9927424D0 (en
Inventor
Ian Hamilton Paling
Robert Welsh
David Mark Fletcher
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Corin Ltd
Original Assignee
Corin Ltd
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Filing date
Publication date
Application filed by Corin Ltd filed Critical Corin Ltd
Priority to GB9927424A priority Critical patent/GB2347864B/en
Publication of GB9927424D0 publication Critical patent/GB9927424D0/en
Publication of GB2347864A publication Critical patent/GB2347864A/en
Application granted granted Critical
Publication of GB2347864B publication Critical patent/GB2347864B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30721—Accessories
    • 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
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2/4609—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of acetabular cups
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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    • 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
    • A61F2002/30576—Special structural features of bone or joint prostheses not otherwise provided for with extending fixation tabs
    • A61F2002/30578—Special structural features of bone or joint prostheses not otherwise provided for with extending fixation tabs having apertures, e.g. for receiving fixation screws
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30795—Blind bores, e.g. of circular cross-section
    • A61F2002/30807—Plurality of blind bores
    • A61F2002/30808—Plurality of blind bores parallel
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • 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
    • A61F2002/30841—Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30891—Plurality of protrusions
    • A61F2002/30892—Plurality of protrusions 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
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30891—Plurality of protrusions
    • A61F2002/30894—Plurality of protrusions inclined obliquely 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
    • A61F2002/30929—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth having at least two superposed coatings
    • 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
    • A61F2002/3241—Joints for the hip having a ring, e.g. for locking the femoral head into the acetabular cup
    • 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
    • A61F2/34—Acetabular cups
    • A61F2002/345—Acetabular cups the inner and outer (hemi)spherical surfaces of a shell, e.g. an intermediate shell, having distinct centres of rotation, both located on the centre line of the shell
    • 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
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00029—Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00179—Ceramics or ceramic-like structures
    • A61F2310/00185—Ceramics or ceramic-like structures based on metal oxides
    • A61F2310/00203—Ceramics or ceramic-like structures based on metal oxides containing alumina or aluminium oxide
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00179—Ceramics or ceramic-like structures
    • A61F2310/00185—Ceramics or ceramic-like structures based on metal oxides
    • A61F2310/00239—Ceramics or ceramic-like structures based on metal oxides containing zirconia or zirconium oxide ZrO2
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00389—The prosthesis being coated or covered with a particular material
    • A61F2310/00395—Coating or prosthesis-covering structure made of metals or of alloys
    • A—HUMAN NECESSITIES
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    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00389—The prosthesis being coated or covered with a particular material
    • A61F2310/00592—Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
    • A61F2310/00796—Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite

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

Abstract

A dysplasia attachment 22 for preventing movement of an acetabular cup 10 in a patient's dysplastic acetabulum. The attachment 22 has an annular portion 24 mountable on a rim 16 of the acetabular cup 10, and at least one fixing member (not shown) for attaching the annular portion 24 to the patient's acetabulum. The attachment preferably has at least one projection on its underside for location in a performed aperture in the rim of an acetabular cup.

Description

IMPROVEMENTS IN OR RELATING TO THE ATTACHMENT OF AN ACETABULAR CUP TO A DYSPLASTIC ACETABULUM The present invention relates to a dysplasia attachment for preventing movement of an acetabular cup attachable to a patient's dysplastic acetabulum, a dysplastic cup, and a method of preventing movement of an acetabular cup attachable to a patient's dysplastic acetabulum.
Hip prostheses commonly consist of an acetabular cup and a femoral stem having a ball joint designed to be held inside a socket in the acetabular cup. Prior to the replacement operation, a surgeon will often not exactly know the specifics of the hip prosthesis a patient will require, and will thus rely on a stock of"off-the-shelf" components. Occasionally, a surgeon will find that a malformation of a patient's acetabulum exists. In this case, a dysplastic cup may be required in place of a standard acetabular cup. However, this often necessitates that a stock of all sizes of acetabular cup and all sizes of dysplastic cup be available.
A known dysplastic cup has projecting therefrom an apertured flange which is able to receive a fixing member that securely attaches the cup to a dysplastic acetabulum. Movement of the cup relative to the patient's acetabulum is thus prevented, but an undesirable moment is imparted to the cup due to the single point attachment.
The present invention seeks to provide a dysplasia attachment by which a known acetabular cup can be transformed into a dysplastic cup.
According to a first aspect of the invention there is provided a dysplasia attachment for preventing movement of an acetabular cup in a patient's dysplastic acetabulum, the attachment having an annular portion mountable on a rim of the acetabular cup, and at least one fixing member for attaching the annular portion to the patient's acetabulum.
Thus, a surgeon can interoperatively determine whether to use the mountable annular portion on the acetabular cup to create a dysplastic cup without having to rely on an availability of a dysplastic cup of correct size.
Preferably, the inner radius of the annular portion is greater than the inner radius of the rim of the acetabular cup. In this case, the articulating inner surface of the acetabular cup is not extended by the addition of the annular portion.
The dysplasia attachment may comprise at least one projection securely locatable in an associated aperture in the acetabular cup to prevent rotation of the cup relative to the attachment. Advantageously, the at least one projection may be formed on the underside of the annular portion of the attachment, and the associated aperture may be a preformed aperture in the rim of the acetabular cup primarily used to engage an introducing device for introducing and locating the acetabular cup into the patient's acetabulum.
Preferably, the annular portion has at least two flanges integrally projecting from the annular portion. In this case, the at least two flanges are preferably diametrically opposed. Each flange may have an opening through which a fixing member is receivable.
In use, a resultant moment imparted to the acetabular cup through the fixing members of the dysplasia attachment is negligible due to the advantageous diametric positioning of the flanges.
Preferably, each flange is angled relative to the annular portion. In this case, the flange angle is a declination of 20 or substantially 20 from the underside of the annular portion.
According to a second aspect of the invention, there is a dysplastic cup comprising an acetabular cup and a dysplasia attachment according to the first aspect of the invention, wherein the attachment is attachable to the acetabular cup and a patient's movement of the cup in use relative to the patient's acetabulum.
Preferably, the acetabular cup has a polyethylene liner.
According to a third aspect of the invention, there is a method of preventing movement of an acetabular cup attachable to a patient's dysplastic acetabulum, the method comprising the steps of: i) inserting an acetabular cup in the patient's acetabulum, ii) keying a mountable dysplasia attachment to the acetabular cup, and iii) fixing the keyed dysplasia attachment to the dysplastic acetabulum, whereby movement of the cup relative to the acetabulum is prevented.
The invention will now be more particularly described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a plan view of a known acetabular cup, Figure 2 is a side sectional view of the known acetabular cup, Figure 3 is a plan view of an embodiment of a dysplasia attachment in accordance with the first aspect of the present invention, and Figure 4 is a side view of the dysplasia attachment in accordance with the first aspect of the present invention.
Referring firstly to Figures 1 and 2, an acetabular cup 10, which is known from GB-A-9802499.5, has a part-circular outer surface 12 of an appropriate diameter to fit into the acetabulum of a patient. The acetabular cup 10 also has a part circular, typically hemispherical or substantially hemispherical, articulating surface 14 having a diameter appropriate for receiving a femoral head (not shown). The diameter of the articulating surface 14 is within the range 40 to 60 millimetres. The acetabular cup 10 is formed of metal, preferably high carbon cobalt chrome-alloy, although it could be formed of a ceramic material, such as zirconia and alumina. The acetabular cup may also be capable of receiving a polyethylene liner, such as an Ultra High Molecular Weight Polyethylene liner.
Extending between the outer surface 12 and the articulating surface 14 is an annular rim 16. The surface of the rim 16 is planar. The rim 16 is provided with three equi-angularly spaced introducer recesses 18. The recesses 18 open out only into the rim 16 and are spaced from the outer surface 12 and the inner surface 14.
Prongs of an introducing device, known from GB-A-9802499.5, are releasably locatable in the recesses 18. The acetabular cup 10 is thus introducible and locatable in a patient's acetabulum via the introducing device.
To improve the fixation of the acetabular cup 10 in the acetabulum of the patient, the outer surface of the cup may be textured and/or comprise a plurality of splines 20. These splines 20 are located at approximately 45 to the position of one of the recesses 18. To further aid fixation, the acetabular cup 10 is shaped such that the equatorial diameter de of the outer surface 12 is greater than the polar diameter dp of the outer surface 12. The acetabulum is then reamed to the same dimension as the polar diameter dp. The cup 10 can then be jammed into the acetabulum due to the larger equatorial diameter of the cup 10. This is particularly advantageous in the case of introducing metal cups for metal-on-metal articulation since the larger frictional torque can cause the cup to tear out of the acetabulum before it can become fixed by bone growth.
Metal cups 10 are either formed by forging or investment casting. The investment casting is subjected to hot isostatic pressing (HIP) and solution heat treatment processes. The inner surface 14 of the cup is then highly polished.
The outer surface 12 of the cup 10 may be coated with artificial bone substitute material, such as Hydroxyapatite, or the surface may have a metal porous coated or plasma coated surface to enhance fixation of the cup 10 within the acetabulum of the patient. The outer surface 12 may, for example, be coated with Hydroxyapatite and a porous coating over a majority of the area of the outer surface 12.
Referring now to Figures 3 and 4, the dysplasia attachment 22 shown therein comprises an annular portion, which is typically a ring 24, flanges 26, a plurality of acetabular cup engaging projections 28, and fixing members (not shown).
The ring 24 of the dysplasia attachment 20 is formed in the same manner and of the same material as that described above with respect to the acetabular cup 10.
The radius of the inner circumferential edge of the ring 24 is slightly greater than the radius of the inner edge of the rim 16 of the cup 10. The outer edge of the ring 24 may have a radius equal to or greater than the radius of the outer edge of the rim 16.
In order that the dysplasia attachment 22 can be surely mounted on the cup 10, advantage is taken of the recesses 18 in the rim 16 of the cup 10. Each of the acetabular cup engaging projections 28 is locatable in a corresponding recess 18, so that, when in engagement, the cup 10 is unable to rotate relative to the ring 24.
The flanges 26 integrally project from the ring 24 and are typically diametrically opposed to limit any in use resultant moment imparted to the cup 10.
Apertures 30, through which the fixing members are receivable, are provided in the flanges 26. The flanges 26 are also angled, typically with a declination of 20 , relative to the underside surface of the ring 24. This allows a higher clamping force to be imparted by the ring 24 when acting on the acetabular cup 10.
During a hip prosthesis implantation, a surgeon may interoperatively decide that a standard acetabular cup is inappropriate and that a dysplastic cup is required.
According to the invention, the acetabular cup 10 may be mounted in the patient's dysplastic acetabulum as originally intended, and the dysplasia attachment 22 is then mounted on the rim 16 of the cup 10 with the projections 28 engaging the recesses 18. The fixing members, inserted through the apertures 30, fix to the patient's dysplastic acetabulum, whereby the acetabular cup 10 is securely held in place by the dysplasia attachment.
The acetabular cup 10 in combination with the dysplasia attachment 22 enable, interoperatively, a commonly available acetabular cup to be fixed to a patient's dysplastic acetabulum without necessitating a specialised dysplastic cup being available. The provision of diametrically opposed flanges and fixing members enables an increase in stability of fixture over previously known dysplastic cups.
The embodiment described above is given by way of example only and various modifications will be apparent to persons skilled in the art without departing from the scope of the invention.

Claims (11)

  1. CLAIMS 1. A dysplasia attachment for preventing movement of an acetabular cup in a patient's dysplastic acetabulum, the attachment having an annular portion mountable on a rim of the acetabular cup, and at least one fixing member for attaching the annular portion to the patient's acetabulum.
  2. 2. A dysplasia attachment according to claim 1, wherein the inner radius of the annular portion is greater than the inner radius of the rim of the acetabular cup.
  3. 3. A dysplasia attachment according to claim 1 or claim 2, wherein the attachment further comprises at least one projection securely locatable in an associated aperture in the acetabular cup to prevent rotation of the cup relative to the attachment.
  4. 4. A dysplasia attachment according to claim 3, wherein the at least one projection is formed on the underside of the annular portion of the attachment, and the associated aperture is a preformed aperture in the rim of the acetabular cup primarily used to engage an introducing device for introducing and locating the acetabular cup into the patient's acetabulum.
  5. 5. A dysplasia attachment according to any one of the preceding claims, wherein the annular portion has at least two flanges integrally projecting from the annular portion.
  6. 6. A dysplasia attachment according to claim 5, wherein the at least two flanges are diametrically opposed.
  7. 7. A dysplasia attachment according to claim 5 or claim 6, wherein each flange has an opening through which a fixing member is receivable.
  8. 8. A dysplasia attachment according to any one of claims 5 to 7, wherein each flange is angled relative to the annular portion.
  9. 9. A dysplasia attachment according to claim 8, wherein the flange angle is a declination of 20 or substantially 20 from the underside of the annular portion.
  10. 10. A dysplastic cup comprising an acetabular cup and a dysplasia attachment as claimed in any one of the preceding claims, wherein the attachment is attachable to the acetabular cup and a patient's dysplastic acetabulum to prevent movement of the cup in use relative to the patient's acetabulum.
  11. 11. A dysplasia attachment substantially as hereinbefore described with reference to the accompanying drawings.
    11. A dysplastic cup according to claim 10, wherein the acetabular cup has a polyethylene liner.
    12. A method of preventing movement of an acetabular cup attachable to a patient's dysplastic acetabulum, the method comprising the steps of: i) inserting an acetabular cup in the patient's acetabulum, ii) keying a mountable dysplasia attachment to the acetabular cup, and iii) fixing the keyed dysplasia attachment to the dysplastic acetabulum, whereby movement of the cup relative to the acetabulum is prevented.
    13. A dysplasia attachment substantially as hereinbefore described with reference to the accompanying drawings.
    Amendments to the claims have been filed as follows CLAIMS 1. A dysplasia attachment for preventing movement of an acetabular cup in a patient's dysplastic acetabulum, the attachment having an annular portion mountable on a rim of the acetabular cup, at least one fixing member for attaching the annular portion to the patient's acetabulum, and at least one projection securely locatable in an associated aperture in the acetabular cup to prevent rotation of the cup relative to the attachment.
    2. A dysplasia attachment according to claim 1, wherein the inner radius of the annular portion is greater than the inner radius of the rim of the acetabular cup.
    3. A dysplasia attachment according to claim 1 or claim 2, wherein the at least one projection is formed on the underside of the annular portion of the attachment, and the associated aperture is a preformed aperture in the rim of the acetabular cup primarily used to engage an introducing device for introducing and locating the acetabular cup into the patient's acetabulum.
    4. A dysplasia attachment according to any one of the preceding claims, wherein the annular portion has at least two flanges integrally projecting from the annular portion.
    5. A dysplasia attachment according to claim 4, wherein the at least two flanges are diametrically opposed.
    6. A dysplasia attachment according to claim 4 or claim 5, wherein each flange has an opening through which a fixing member is receivable.
    7. A dysplasia attachment according to any one of claims 4 to 6, wherein each flange is angled relative to the annular portion.
    8. A dysplasia attachment according to claim 7, wherein the flange angle is a declination of 20 or substantially 20 from the underside of the annular portion.
    9. A dysplastic cup comprising an acetabular cup and a dysplasia attachment as claimed in any one of the preceding claims, wherein the attachment is attachable to the acetabular cup and a patient's dysplastic acetabulum to prevent movement of the cup in use relative to the patient's acetabulum.
    10. A method of preventing movement of an acetabular cup attachable to a patient's dysplastic acetabulum, the method comprising the steps of: i) inserting an acetabular cup in the patient's acetabulum, ii) then keying a mountable dysplasia attachment to the acetabular cup, and iii) then fixing the keyed dysplasia attachment to the dysplastic acetabulum, whereby movement of the cup relative to the acetabulum is prevented.
GB9927424A 1999-11-20 1999-11-20 Attachment for an acetabular cup in a dysplastic acetabulum Expired - Fee Related GB2347864B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9927424A GB2347864B (en) 1999-11-20 1999-11-20 Attachment for an acetabular cup in a dysplastic acetabulum

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9927424A GB2347864B (en) 1999-11-20 1999-11-20 Attachment for an acetabular cup in a dysplastic acetabulum

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GB9927424D0 GB9927424D0 (en) 2000-01-19
GB2347864A true GB2347864A (en) 2000-09-20
GB2347864B GB2347864B (en) 2001-02-14

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2883722A1 (en) * 2005-03-31 2006-10-06 Evolutis Sa Easily fitted cotyloid implant, for use as orthopedic implant for hip joint, comprises metal cup with completely smooth internal cavity and external surface with fixing zone and positioning and orienting zone
FR2898266A1 (en) * 2006-03-10 2007-09-14 Michel Timoteo Cotyloid implant for skull cap of resurfacing femoral head, has femoral acetabulum with wall whose thickness increases between peripheral edge and pole, where another edge of acetabulum is inclined at angle with respect to plane
US7485148B2 (en) * 2004-04-20 2009-02-03 Finsbury (Development) Limited Prosthesis
US7918896B2 (en) 2004-09-15 2011-04-05 Wright Medical Technology, Inc. Unitary acetabular cup prosthesis with extension for deficient acetabulum
US8152855B2 (en) 2006-11-03 2012-04-10 Howmedica Osteonics Corp. Method and apparatus for hip femoral resurfacing tooling
FR3004102A1 (en) * 2013-04-09 2014-10-10 Hubert Georges Marcel Candavoine MIXED COTYLOID IMPLANT WITH REPORTED FIXING LEGS
GB2535007A (en) * 2014-12-24 2016-08-10 Matortho Ltd Prosthesis

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Publication number Priority date Publication date Assignee Title
FR2660546A1 (en) * 1990-04-06 1991-10-11 Setiey Louis Module for acetabular reconstruction
DE4102510A1 (en) * 1991-01-29 1992-07-30 Peter Brehm Socket for hip joint prosthesis - is fastened to pelvis by circular flange
FR2758714A1 (en) * 1997-01-29 1998-07-31 Euros Sa Cotyloid prosthesis for hip joint
GB2333961A (en) * 1998-02-05 1999-08-11 Corin Medical Ltd Acetabular cup
US5989293A (en) * 1998-07-17 1999-11-23 Bristol-Myers Squibb Co. Acetabular cup kit for use during hip replacement surgery

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2660546A1 (en) * 1990-04-06 1991-10-11 Setiey Louis Module for acetabular reconstruction
DE4102510A1 (en) * 1991-01-29 1992-07-30 Peter Brehm Socket for hip joint prosthesis - is fastened to pelvis by circular flange
FR2758714A1 (en) * 1997-01-29 1998-07-31 Euros Sa Cotyloid prosthesis for hip joint
GB2333961A (en) * 1998-02-05 1999-08-11 Corin Medical Ltd Acetabular cup
US5989293A (en) * 1998-07-17 1999-11-23 Bristol-Myers Squibb Co. Acetabular cup kit for use during hip replacement surgery

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7485148B2 (en) * 2004-04-20 2009-02-03 Finsbury (Development) Limited Prosthesis
US7918896B2 (en) 2004-09-15 2011-04-05 Wright Medical Technology, Inc. Unitary acetabular cup prosthesis with extension for deficient acetabulum
FR2883722A1 (en) * 2005-03-31 2006-10-06 Evolutis Sa Easily fitted cotyloid implant, for use as orthopedic implant for hip joint, comprises metal cup with completely smooth internal cavity and external surface with fixing zone and positioning and orienting zone
FR2898266A1 (en) * 2006-03-10 2007-09-14 Michel Timoteo Cotyloid implant for skull cap of resurfacing femoral head, has femoral acetabulum with wall whose thickness increases between peripheral edge and pole, where another edge of acetabulum is inclined at angle with respect to plane
US8152855B2 (en) 2006-11-03 2012-04-10 Howmedica Osteonics Corp. Method and apparatus for hip femoral resurfacing tooling
FR3004102A1 (en) * 2013-04-09 2014-10-10 Hubert Georges Marcel Candavoine MIXED COTYLOID IMPLANT WITH REPORTED FIXING LEGS
GB2535007A (en) * 2014-12-24 2016-08-10 Matortho Ltd Prosthesis
GB2535007B (en) * 2014-12-24 2019-04-17 Matortho Ltd Prosthesis
AU2015370690B2 (en) * 2014-12-24 2019-10-31 Matortho Limited Prosthesis

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Publication number Publication date
GB2347864B (en) 2001-02-14
GB9927424D0 (en) 2000-01-19

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