WO1998015241A1 - Shoulder prosthesis - Google Patents

Shoulder prosthesis Download PDF

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Publication number
WO1998015241A1
WO1998015241A1 PCT/US1997/018207 US9718207W WO9815241A1 WO 1998015241 A1 WO1998015241 A1 WO 1998015241A1 US 9718207 W US9718207 W US 9718207W WO 9815241 A1 WO9815241 A1 WO 9815241A1
Authority
WO
WIPO (PCT)
Prior art keywords
stem
head
ribs
prosthesis
projecting rib
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.)
Ceased
Application number
PCT/US1997/018207
Other languages
English (en)
French (fr)
Inventor
Pierre Hoffmeyer
Ian G. Kelly
Michel Mansat
Otto Sneppen
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.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
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 Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Priority to DK97910847T priority Critical patent/DK0930858T3/da
Priority to JP51773298A priority patent/JP4036478B2/ja
Priority to HK00100372.8A priority patent/HK1021695B/en
Priority to AT97910847T priority patent/ATE235864T1/de
Priority to DE69720485T priority patent/DE69720485T2/de
Priority to AU48122/97A priority patent/AU4812297A/en
Priority to EP97910847A priority patent/EP0930858B1/en
Publication of WO1998015241A1 publication Critical patent/WO1998015241A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/40—Joints for shoulders
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/04—Surgical instruments, devices or methods for suturing wounds; Holders or packages for needles or suture materials
    • A61B17/06—Needles ; Sutures; Needle-suture combinations; Holders or packages for needles or suture materials
    • A61B17/06166—Sutures
    • 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
    • A61F2/40—Joints for shoulders
    • A61F2/4059—Humeral 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
    • A61F2/28—Bones
    • A61F2002/2835—Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
    • 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
    • A61F2002/3082—Grooves
    • 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
    • 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
    • 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
    • A61F2/40—Joints for shoulders
    • A61F2/4014—Humeral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic humeral shafts
    • A61F2002/4018—Heads or epiphyseal parts of humerus
    • 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
    • A61F2/40—Joints for shoulders
    • A61F2/4059—Humeral shafts
    • A61F2002/4062—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
    • 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

Definitions

  • This invention relates to a shoulder prosthesis, and in particular to that part of the prosthesis which will replace the humeral head at the proximal end of the arm.
  • Shoulder replacement is a well-known and widely used technique which has been very successful. This is particularly important where the patient has disabling pain which is unresponsive to normal treatments and where the humeral head has suffered from osteoarthritis, rheumatoid arthritis and so on.
  • a shoulder replacement may also he required following acute trauma situations where the humeral head has been fractured. In such circumstances frequently the bone in that area has been fractured into several pieces including separation of the humeral head or separation of the head and the greater and lesser tuberosities from the main part of the humerus.
  • the proximal humerus in many prior systems comprises a head and a stem and a number of radially directed ribs are provided at the proximal end. These have a strengthening function, and once the stem has been implanted into the proximal end of the humerus, they help to ensure that the stem cannot rotate relative the humerus.
  • Such ribs include a lateral rib, a strengthening and supporting rib for the humeral head which is diametrically opposite this lateral rib, and, at right angles to these two ribs, a further pair of ribs that have a strengthening effect.
  • the lateral rib is usually provided with a number of small holes, which can be used to suture a separated greater and/or lesser tuberosity into place to allow union with the main part of the bone if they have been fractured or osteotomised.
  • shoulder prostheses examples include prostheses available under the trade designation "Neer II system” and "3M Modular Shoulder” from 3M Health Care Ltd., a subsidiary of Minnesota Mining and Manufacturing Company, St. Paul, Minnesota. Competing shoulder prostheses are also available.
  • shoulder prostheses are disclosed, for example, in US Patent Nos. 3,916,451 ; 3,978,528; 4,179,758; 4,919,670; 4,919,669 and 5,462,563; PCT Patent Publication No. WO 96/17553; European Patent Publication Nos. EP 0 041 591; EP 0 177 503; EP 0 216 489; EP 0 299 889 and EP 0 639 359; British Patent Nos. GB 1,438,950 and GB 2,223,172; and German Patentschrift No. DE 195 09 037.
  • the present invention provides a proximal humeral prosthesis in which these problems are at least mitigated.
  • a proximal humeral prosthesis comprises a head corresponding to the humeral head of a patient, and a stem having a proximal end to which the head is mounted.
  • the stem extends at an oblique angle away from the head, and is adapted to be received in the proximal end of the humerus and to be fixed therein to hold the prosthesis in place so that the head then corresponds in position to that of the humeral head.
  • the prosthesis has a central plane coincident with the longitudinal axis of the stem about which it has a mirror axis of symmetry. At least one, and preferably two, projecting ribs are positioned at or near the proximal end of the stem adjacent the head, with the projecting rib being offset relative to the center plane at an offset angle of from about 20° to about 40°.
  • each projecting rib is provided with means, such as holes, to suture one or both of a separated lesser or greater tuberosity in place.
  • means such as holes
  • the outer edge of one of the two ribs is going to be positioned near to the base of the bicipital groove, ready access to that rib can be obtained to suture a lesser tuberosity if that is broken and separated. That rib, or alternatively or additionally, the other ribs can be used to assist the suture of the greater tuberosity if that is separated or detached.
  • These two ribs will generally have a thickness of the order of 1 to 3 mm. Preferably they are about 2mm thick.
  • They preferably extend radially out from the stem by a distance of from 2 to 5 mm, and most preferably about 3mm. Preferably they have a length measured parallel to the axis of the stem of from 20 to 35 mm, and most preferably about 32 mm.
  • These two projecting ribs are each desirably angled to the central plane at an angle of from 25 to 35°, more desirably 29 to 31°, and most preferably at an angle of about 30° so that there is an included angle between them of about 60°.
  • These projecting ribs are preferably provided at substantially equal but opposite offset angles relative to the central plane (i.e., the plane of symmetry), although it will be understood that unequal offset angles could be provided, for example, on unique right and left shoulder prostheses rather than the preferred prosthesis, which can be used on either the right or left side.
  • the stem be hollowed out into a smooth scallop between the two ribs. This has the advantage that one can fill this region with bone chips and pull the tuberosities tightly against these, so that with the good blood supply to the tuberosities, this region should regenerate fresh bone which then assists in holding the prosthesis in place.
  • the prosthesis need not be any different from a conventional prosthesis, for example, the prostheses available under the trade names "Neer II” and "3M Modular Shoulder.”
  • the stem may be arranged to be a cement-less fit within the medullary canal of the humerus or to be fixed in place by cement.
  • the stem may be provided with one or more, preferably two, longitudinal grooves which may be slightly tapered to aid in pressurizing and extruding excess cement if cement is used.
  • the stem itself is preferably slightly tapered, e.g. an included angle of about 1 ° and the hole made in the medullary canal to receive the stem will be very slightly undersize so that the stem is a tight fit.
  • a range of prostheses will be required with stems of differing diameter and length to suit patients of differing sizes and conditions.
  • the head will be formed as part of a sphere to engage with the patient's glenoid or if that is damaged with a glenoid replacement.
  • the axis of the head medially relative to the axis of the stem to simulate the similar angling of the humeral head relative the humerus.
  • the radial height of the head also needs to be chosen to suit a particular patient and so a range of prostheses with differing head heights will normally need to be available to the surgeon. As the radial head height increases, so will the overall size of the head increase. It is desirable, however, that the head should not extend significantly beyond the stem in the axial direction of the stem since otherwise the head can inflame the tendons of the rotator cuff.
  • a rib will normally be provided between the head and the stem to provide mechanical support for the part of the head which is displaced from alignment with the stem.
  • This rib can conveniently be of a thickness of the order of from 1 to 3 mm and preferably be about 2mm thick.
  • the prosthesis may be a so-called "monoblock" system where the head and stem are formed integrally.
  • the Neer II system noted above is a monoblock system.
  • the prosthesis may be a modular system where the stem and head are separate and the head is fitted in place once the stem has be secured, the joint between the head and a projection from the stem being of the Morse taper type.
  • the 3M Modular Shoulder noted above is of the latter type.
  • the prosthesis is preferably made from cobalt chrome steel, although other materials are also acceptable, such as titanium.
  • a method of treating a fractured humerus where the lesser or greater tuberosity or both have become fractured in an accident or separated as a result of other trauma generally comprises the following steps:
  • a proximal humeral prosthesis comprising: a head corresponding to the humeral head of a patient; and a stem having a proximal end to which the head is mounted, the stem extending at an oblique angle away from the head, the stem being adapted to be received in the proximal end of the humerus and to be fixed therein to hold the prosthesis in place so that the head then corresponds in position to that of the humeral head, the prosthesis having a central plane coincident with the longitudinal axis of the stem about which it has a mirror axis of symmetry; and a projecting rib positioned at or near the proximal end of the stem adjacent the head, the projecting rib being offset relative to the center plane at an offset angle approximating the position of the greater or lesser tuberosity of the humerus (c) inserting the stem into the proximal end of the humerus and aligning the projecting rib with the bicipital groove; (c) insert
  • a plurality of holes are provided in the projecting rib; and the suturing step includes passing a suture through one of the holes in the projecting rib.
  • a scallop is formed in the stem adjacent the projecting rib and generally in alignment with the central plane. The scallop is filled with bone chips and the tuberosities are pulled tightly against the bone chips with the suture.
  • the projecting rib constitutes a first projecting rib
  • the prosthesis further includes a second projecting rib a positioned at or near the proximal end of the stem adjacent the head.
  • the second projecting rib is offset relative to the center plane in the direction opposite the first projecting rib at an angle substantially equal to the offset angle.
  • the first and second projecting ribs each having a plurality of holes formed therethrough.
  • the suturing step preferably then includes passing a suture through one of the holes in each of the projecting ribs.
  • the scallop is formed in the stem between the projecting ribs.
  • Figure 1 is diagram of the end of a humerus showing the various component parts
  • Figure 2 is a side view of one embodiment of a humeral prosthesis according to the invention
  • Figure 3 is an elevation taken at right angles to the view of Figure 2:
  • Figure 4 is a section on the line 4-4 of Figure 2;
  • Figure 5 is a diagram similar to Figure 1 showing superimposed the section of a humeral prosthesis according to the invention.
  • Figure 6 is a view similar to Figure 2 of another prosthesis according to the invention.
  • Figure 1 shows a typical proximal end to a humerus 10.
  • a rounded humeral head 11 which forms the actual joint with the scapula.
  • a groove 16 Positioned around that humeral head 11 is the greater tuberosity 12 and the lesser tuberosity 14 and between these two is a groove 16 known as the bicipital groove.
  • Figures 2 to 4 show a humeral prosthesis 20 according to the invention. It comprises a head 22 and a stem 24, which are preferably integrally formed from cobalt chrome steel with a supporting rib 26 extending between them.
  • the stem 24 also has longitudinal grooves 28.
  • the stem 24 is arranged to fit into the medullary canal with the head 22 positioned to replace the humeral head 11.
  • the prosthesis 20 according to the invention also has a pair of projecting ribs 30 and 32. These projecting ribs 30 and 32 are spaced equally by an offset angle which is approximately 30° from the central axis of the stem 24 and about which the prosthesis 20 is a mirror image. It can be seen from Figure 5 that one is approximately aligned in a direction leading directly towards the bicipital groove. The other would be so aligned in the case of the other shoulder of a patient.
  • the projecting ribs 30 and 32 have holes 36. These holes constitute one example of a means in the projecting ribs 30, 32 for securing bone tissue to the prosthesis 20. As shown the ribs 30 and 32 can be used to suture a lesser tuberosity that has become misplaced. In addition that projecting rib 30 can also be used to suture on a greater tuberosity and if necessary the other projecting rib 32 can additionally be used for suturing the greater tuberosity.
  • the prosthesis 40 shown in Figure 6 has a smaller head 42. It will be noted however that, whilst it is still angled at the same angle to the axis 34 of the stem, the head 42 is not displaced in the lateral direction as far as the head 22 of the prosthesis 20 so that the edge of neither head projects significantly beyond the respective stem.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)
  • Forging (AREA)
  • Materials For Medical Uses (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
PCT/US1997/018207 1996-10-09 1997-10-08 Shoulder prosthesis Ceased WO1998015241A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DK97910847T DK0930858T3 (da) 1996-10-09 1997-10-08 Skulderprotese
JP51773298A JP4036478B2 (ja) 1996-10-09 1997-10-08 人工肩関節
HK00100372.8A HK1021695B (en) 1996-10-09 1997-10-08 Shoulder prosthesis
AT97910847T ATE235864T1 (de) 1996-10-09 1997-10-08 Schulterprothese
DE69720485T DE69720485T2 (de) 1996-10-09 1997-10-08 Schulterprothese
AU48122/97A AU4812297A (en) 1996-10-09 1997-10-08 Shoulder prosthesis
EP97910847A EP0930858B1 (en) 1996-10-09 1997-10-08 Shoulder prosthesis

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9620998.6 1996-10-09
GBGB9620998.6A GB9620998D0 (en) 1996-10-09 1996-10-09 Shoulder prosthesis
US08/946,758 US5944758A (en) 1996-10-09 1997-10-08 Shoulder prosthesis

Publications (1)

Publication Number Publication Date
WO1998015241A1 true WO1998015241A1 (en) 1998-04-16

Family

ID=26310185

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/018207 Ceased WO1998015241A1 (en) 1996-10-09 1997-10-08 Shoulder prosthesis

Country Status (11)

Country Link
US (1) US5944758A (enExample)
EP (1) EP0930858B1 (enExample)
JP (1) JP4036478B2 (enExample)
AT (1) ATE235864T1 (enExample)
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EP0930858B1 (en) 2003-04-02
DE69720485T2 (de) 2004-03-04
ES2195120T3 (es) 2003-12-01
US5944758A (en) 1999-08-31
ATE235864T1 (de) 2003-04-15
JP2001501851A (ja) 2001-02-13
JP4036478B2 (ja) 2008-01-23
AU4812297A (en) 1998-05-05
HK1021695A1 (en) 2000-06-30
DE69720485D1 (de) 2003-05-08
GB9620998D0 (en) 1996-11-27
EP0930858A1 (en) 1999-07-28
DK0930858T3 (da) 2003-07-21

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