GB2033755A - A hip prosthesis - Google Patents

A hip prosthesis Download PDF

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Publication number
GB2033755A
GB2033755A GB7934816A GB7934816A GB2033755A GB 2033755 A GB2033755 A GB 2033755A GB 7934816 A GB7934816 A GB 7934816A GB 7934816 A GB7934816 A GB 7934816A GB 2033755 A GB2033755 A GB 2033755A
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GB
United Kingdom
Prior art keywords
femur
head
plate
neck
screw
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Withdrawn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
GB7934816A
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
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of GB2033755A publication Critical patent/GB2033755A/en
Withdrawn legal-status Critical Current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
    • A61F2/36—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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/74—Devices for the head or neck or trochanter of the femur
    • A61B17/742—Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8665—Nuts
    • 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
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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
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2/367—Proximal or metaphyseal parts of shafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
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    • 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
    • A61F2/4607—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 hip femoral endoprostheses
    • 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
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/30199—Three-dimensional shapes
    • A61F2002/30205—Three-dimensional shapes conical
    • A61F2002/3021—Three-dimensional shapes conical frustoconical
    • 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
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/30199—Three-dimensional shapes
    • A61F2002/30205—Three-dimensional shapes conical
    • A61F2002/30217—Three-dimensional shapes conical hollow cones, e.g. tubular-like cones
    • 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
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30405—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by screwing complementary threads machined on the parts themselves
    • 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
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30433—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
    • 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
    • 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
    • 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
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    • 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
    • A61F2002/30774—Apertures or holes, e.g. of circular cross section internally-threaded
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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
    • A61F2002/3085—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface
    • A61F2002/30873—Threadings machined on non-cylindrical external surfaces
    • 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
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    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3611—Heads or epiphyseal parts of femur
    • 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
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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
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    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
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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
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    • A61F2/4637—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for connecting or disconnecting two parts of a prosthesis
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    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
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    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063—Three-dimensional shapes
    • A61F2230/0067—Three-dimensional shapes conical
    • A—HUMAN NECESSITIES
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    • 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
    • A61F2310/00598—Coating or prosthesis-covering structure made of compounds based on metal oxides or hydroxides
    • A61F2310/00604—Coating made of aluminium oxide or hydroxides

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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)
  • Surgical Instruments (AREA)

Abstract

A hip prosthesis having a base intended to lie against the resectioned neck of the femur, and from which a ball projects upwardly, has a conical hollow rod which is provided with a sloped screw thread which may be coated with a porous material. The rod is screwed into the femur neck and retained in place without adhesive. Additional anchorage is obtained by passing a recall screw through the femur neck from beneath into the hollow rod which is internally threaded. The ball is rotated by means of a key so as to seat it on the base.

Description

SPECIFICATION A hip prosthesis This invention relates to a hip prosthesis.
Two types of hip prostheses are now used;double sealed cup prostheses and intramedullary prostheses. Double seal cup prostheses comprise a metal cup sealed on to the head of the bored femur and a plastic cup sealed on to the cotyloid cavity. This type of prostheses has the drawback that it is difficult to place because the head of the femur must have been previously drilled. Further, there are risks of necrosis of the femur head under the cement, such necrosis leading to bone breakage thereby making new surgery necessary.
Intramedullary prostheses comprise a femoral head intended to be engaged in the medullary canal of the femur after total resection of its head. It is quite obvious that such a prosthesis is not physiologically ideal because it is placed at the sacrifice of the femoral neck and, further, the rod placed in the medullary canal has the drawback of considerably stiffening the femur. Further, installing this type of prosthesis is never easy and risks of femoral facture are always to be feared. Finally, necrosis of the bone caused by the cement during its polymerisation causes unsealings over time.
Hip prostheses have been proposed made up of a plate forming a base and carrying, on its front face, a spherical head intended to replace the femur head and, on its back face, a threaded rod to be fastened in the neck of the femur. The back face of the plate rests against the truncated end of the neck of the femur, and the front face of the plate further exhibits means allowing its rotational movement. This prosthesis, in comparison with the intramedullary prostheses, has the advantage preserving the neck of the femur which avoids any intervention into the medullary canal and, consequently, preserves elasticity for the femur. However, it exhibits the drawback of requiring a relatively long and difficult surgical emplacement.
The object of the invention is to remedy the above drawbacks by facilitating the emplacement of the prosthesis and considerably reducing the time necessary for the surgery.
According to the present invention a hip prosthesis comprises a plate forming a base and carrying, on its front face, a spherical head intended to replace the femur head and, on its back face, a conical threaded rod able to be screwed into the neck of the femur after resection of the femur head so that the back face of the plate rests against the truncated end of the femur neck, the front face of the plate further comprising means to permit seating of said spherical head by rotation using a suitable tool.
Preferably the thread of the rod is sloped slightly so that the use of a sealant in the neck of the femur is not essential.
A further preference is that the spherical head is connected to the base removably, for example, by means of a cylindrical thread and a conical bearing, as described and claimed in the French Certificate of Addition, No.
7613189, in the name of the Applicants. This arrangement makes possible various hip operations without the need of removing the femoral prosthesis.
To assist a still tighter hold of this prosthesis in the neck of the femur without using sealant, the lower or free end of the threaded rod may be provided with a tapped bore able to receive a recall screw, the head of which is intended to rest directly, or by means of an intermediate plate, against the cortex of the femur, opposite the neck.
To eliminate any risk of unscrewing of the prosthesis, the head of the recall screw may rest against the cortex of the femur by means of an intermediate plate provided with a hole, naking possible its fastening by a screw to the femur. The head of the threaded recall screw itself is externally threaded and goes through a tapped hole in the plate and the threading pitch of this hole and, consequently, that of the head of the recall screw is less than that of the head of this screw. This arrangement results in a differential effect which results in a strong pull exerted on the rod of the prosthesis as the head of the recall screw enters the tapped hole in the plate, and tends to pull the base strongly against the truncated end of the neck of the femur. This differential effect further has the result of practically eliminating any risk of the prosthesis coming unscrewed.
To improve still more the hold of the threaded rod in the neck of the femur, its thread is advantageously coated, as is known, with aluminium oxide, which gives it a porous surface state and. consequently, a better hold in the neck of the femur.
One embodiment of the invention will now be described with reference to the accompanying diagrammatic drawing which is a part sectional side elevation of a hip prosthesis.
The illustrated prosthesis is made up of a plate 2 forming the base. On its front face, the plate 2 carries a spherical head 3 which is preferably removably fastened to the plate 2 as described in French Certificate of Addition No. 76131 89 in the name of the Applicants, i.e., by a cylindrical thread 4 and a conical bearing 5. In this case, a rod 3a of the head 3 has at its end located on the side of spherical head 3, flat parts 6 permitting it to be grasped by a flat key for rotation thereof.
On its back face, the plate 2 carries a threaded rod 7 with a conical outside shape and having an outside conical thread 8 with a slight slope.
The prosthesis is intended to be fastened to the femur of a patient after resection of the head 9 of the femur, which makes it possible to preserve practically the whole neck 11 of the femur. Placement of the prosthesis is therefore made by engagement of threaded conical rod 7 in a bore made in the neck of the femur 11 after resection of the head 9 to the point that the back face of plate 2 is supported against the truncated end of the neck of the femur 11.
For this purpose, the plate 2 comprises means making possible its driving-in by rotation, such as holes 12 making possible the engagement of a key with lugs, or flat parts 13 making possible the use of a flat key.
The conical shape of rod 7 and of the thread 8 makes possible a much more rapid placement than if the rod and thread were cylindrical. Actually, the conical shape makes it possible to almost totally introduce the rod 7 without screwing, the screwing having to be performed only at the end of the introduction.
The slight slope of the thread 8 has the effect of making the screwing irreversible and, consequently, of considerably reducing the risks of unscrewing of the prosthesis, and making the use of sealant almost totally unnecessary.
However, to improve the hold of the rod 7 in the neck of femur 11, the thread 8 is advantageously coated with aluminium oxide which provides it with a porous surface and reinforces its hold in the neck of the femur 11.
Again, according to another advantageous characteristic of the invention to ensure even better that unscrewing of the rod 7 will not occur, the free or narrow end of the rod 7 is provided with a tapped bore 14 in which can be engaged a recall screw 15, whose head rests against the cortex of the femur opposite the femur head 9.
According to an improved embodiment of the device, there is associated with a recall screw 15 a curved plate 16 shaped to be applied in a complementary manner against the femur cortex. The plate 16 has a smooth bore 17 preferably drilled for passage of a screw making possible its fastening to the femur. Such plate may also have a tapped hole 18 intended to receive the externally threaded head 1 5a of the recall screw 15, the thread of the head 1 5a and, consequently, of the tapped hole 18 having a pitch less than that of the recall screw 15, from which results a differential effect assuring a strong pull in the direction of arrow 19 on the rod 7 of the prostheSis which has the effect of eliminating any risk of unscrewing of the prosthesis.
As can be seen, the prosthesis of the invention does not require passage into the medullary canal of the femur which thereby preserves all of its flexibility. As also can be seen from the above description, the prosthesis of the invention makes possible the use of the removable spherical head, which avoids having to remove the body of the prosthesis and particularly its rod 7 from the necl of femur 11 during an operation at the hip.

Claims (6)

1. A hip prosthesis comprising a plate forming a base and carrying, on its front face, a spherical head intended to rep!ace the femur head and, on its back face, a conical threaded rod able to be screwed into the neck of the femur after resection of the femur head so that the back face of the plate rests against the truncated end of the femur neck, the front face of the plate further comprising means to permit seating of said spherical head by rotation using a suitable tool.
2. A hip prosthesis according to Claim 1, wherein the thread of said conical rod has a slight slope.
3. A hip prosthesis according to Claim 1 or Claim 2, wherein said spherical head is connected to said base removably.
4. A hip prosthesis according to any of Claims 1 to 3, wherein a recall screw is provided, the free end of the threaded rod having a tapped bore able to receive said threaded screw, the head of which is intended to bear against the cortex of the femur opposite the neck.
5. A hip prosthesis according to Claim 4, wherein the head of the recall screw rests against a curved plate which, in turn, is adapted to rest against the cortex of the femur, said plate being provided with a hole, and a screw for passing through such hole permitting its fastening to the femur, the head of the threaded screw being itself externally threaded and passing through a tapped hole in said plate.
6. A hip prosthesis substantially as hereinbefore described with reference to the accompanying drawing.
GB7934816A 1978-10-12 1979-10-08 A hip prosthesis Withdrawn GB2033755A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7829850A FR2438470A1 (en) 1978-10-12 1978-10-12 HIP PROSTHESIS

Publications (1)

Publication Number Publication Date
GB2033755A true GB2033755A (en) 1980-05-29

Family

ID=9213948

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7934816A Withdrawn GB2033755A (en) 1978-10-12 1979-10-08 A hip prosthesis

Country Status (3)

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ES (1) ES484932A1 (en)
FR (1) FR2438470A1 (en)
GB (1) GB2033755A (en)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0099167A1 (en) * 1982-05-14 1984-01-25 Carbomedics Inc. Proximal femur implant
DE3420035A1 (en) * 1984-05-29 1985-12-05 Scheunemann, Rüdiger, Dipl.-Ing., 5204 Lohmar Artificial joint system with ideal natural force introduction
GB2166359A (en) * 1984-11-06 1986-05-08 Bristol Myers Co Compression hip screw assembly
WO1986003962A1 (en) * 1985-01-11 1986-07-17 S.A. Manufacture Belge De Gembloux Joint member for a hip prosthesis
GB2176709A (en) * 1985-05-17 1987-01-07 John Marston Symington Fixture for attaching prosthesis to bone
DE3538346A1 (en) * 1985-10-29 1987-05-07 Ingo Kliefoth HIP JOINT PROSTHESIS AND METHOD AND DEVICE FOR YOUR IMPLANTATION
DE3607824A1 (en) * 1986-01-21 1987-09-10 Werner Dr Med Steinleitner Cementless, rotationally stable compression hip endoprosthesis
GB2192543A (en) * 1986-06-13 1988-01-20 Finsbury Peg for use in prosthetic devices
US5120171A (en) * 1990-11-27 1992-06-09 Stuart Surgical Bone screw with improved threads
US5226766A (en) * 1990-11-27 1993-07-13 Stuart Surgical Bone screw with improved threads
AU661565B2 (en) * 1992-02-28 1995-07-27 Astra Aktiebolag Hip joint prosthesis
US5492442A (en) * 1990-11-27 1996-02-20 National Medical Specialty, Inc. Bone screw with improved threads
DE19610741C1 (en) * 1996-03-20 1997-11-20 Eska Implants Gmbh & Co Internal locking prosthesis for artificial hip-joint
US5725593A (en) * 1995-02-22 1998-03-10 Caracciolo; Francesco Total anatomic hip prosthesis
NL1009832C2 (en) * 1998-08-10 2000-02-11 Novarticulate Bv Hip replacement.
DE19834277A1 (en) * 1998-07-30 2000-02-17 Gamal Baroud Femoral neck endoprosthesis for an artificial hip joint
WO2001013824A1 (en) * 1999-08-20 2001-03-01 University College London Conservative hip
NL1016551C2 (en) * 2000-11-07 2002-05-14 Erik Leonard Hoffman Fastening element, for hip prosthesis, has plate-shaped supporting element, and hollow pin driven into spongy bone, and secured by fixing plate and openings through which bone can grow
EP1205163A1 (en) * 2000-11-07 2002-05-15 Erik Leonard Hoffman Fastening element for an implant, in particular a hip prosthesis
EP1499268A1 (en) * 2002-04-11 2005-01-26 Theodore Crofford Femoral neck fixation prosthesis
US7156879B1 (en) * 1999-10-06 2007-01-02 Astra Tech Ab Femur fixture and set of femur fixtures
US7476253B1 (en) * 2004-08-11 2009-01-13 Biomet Manufacturing Corporation Humeral head preserving implant
US7914584B2 (en) 2004-10-21 2011-03-29 Biomet Manufacturing Corp. Prosthesis system with trunnion and removably coupled head
US8801799B2 (en) 2008-07-24 2014-08-12 Howmedica Osteonics Corp. Femoral head prosthesis
WO2023215419A1 (en) * 2022-05-04 2023-11-09 Rtg Scientific, Llc Joint arthroplasty implants and systems
US11883081B2 (en) 2020-11-19 2024-01-30 Rtg Scientific, Llc Fastening devices, systems, and methods
US12121271B2 (en) 2021-09-08 2024-10-22 Rtg Scientific, Llc Femoral fixation devices, systems, and methods

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FR2481596A1 (en) * 1980-04-30 1981-11-06 Rambert Andre INSTRAMEDULAR PROSTHESIS NOT SEALED FOR HIP JOINTS
SE9102216D0 (en) * 1991-07-23 1991-07-23 Astra Ab HIP JOINT PROSTHESIS
ES2204234B2 (en) * 2001-05-16 2005-04-16 Jose Martinez Tetas PROTECTIVE ADAPTATION DEVICE FOR HIP AND SHOULDER.
EP2529703A1 (en) 2011-06-03 2012-12-05 Philipp Bourse Hip prosthesis

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FR59919E (en) * 1949-11-17 1954-09-21 New form of osteo-articular prosthesis
FR1043640A (en) * 1951-10-09 1953-11-10 Chimiotechnic Union Chimique D Process for the purification of aryls-alkyls
FR1046516A (en) * 1951-12-18 1953-12-07 Chevalier Et Fils E Artificial femur heads
US2682265A (en) * 1951-12-28 1954-06-29 Marie B Collison Trochanteric plate and artificial femoral head
US2696817A (en) * 1952-04-30 1954-12-14 Samuel B Prevo Prosthetic elbow joint
BE516826A (en) * 1952-09-26
FR1075914A (en) * 1953-04-16 1954-10-21 Cephalofemoral prosthesis device
FR1095012A (en) * 1953-12-07 1955-05-26 Improvement of plastic femoral heads and prosthesis parts in general
FR1099519A (en) * 1954-01-29 1955-09-06 Chevalier Et Fils E Artificial femoral head
FR1105392A (en) * 1954-07-23 1955-11-30 Improvements to prostheses
US2947308A (en) * 1956-11-02 1960-08-02 Harry A Gorman Hip joint prosthesis
DE2015324A1 (en) * 1970-03-31 1971-11-04 Timmermans, Dr.med.Dr.Phil. Franz Donatus, 2300 Kiel Endoprosthesis, preferably for the hip joint, and method for its manufacture
FR2295729A1 (en) * 1974-12-27 1976-07-23 Mahay Et Cie TOTAL HIP PROSTHESIS
FR2310120A2 (en) * 1975-05-05 1976-12-03 Ceraver Joint prosthesis with ball and socket - having aluminium oxide ball with titanium shaft coupled over metal insert
CH602091A5 (en) * 1976-06-03 1978-07-31 Huggler Arnold
DE2634954A1 (en) * 1976-08-04 1978-02-09 Sigri Elektrographit Gmbh JOINT PROSTHESIS

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0099167A1 (en) * 1982-05-14 1984-01-25 Carbomedics Inc. Proximal femur implant
DE3420035A1 (en) * 1984-05-29 1985-12-05 Scheunemann, Rüdiger, Dipl.-Ing., 5204 Lohmar Artificial joint system with ideal natural force introduction
GB2166359A (en) * 1984-11-06 1986-05-08 Bristol Myers Co Compression hip screw assembly
WO1986003962A1 (en) * 1985-01-11 1986-07-17 S.A. Manufacture Belge De Gembloux Joint member for a hip prosthesis
GB2176709B (en) * 1985-05-17 1989-07-05 John Marston Symington Fixture for attaching prosthesis to bone
GB2176709A (en) * 1985-05-17 1987-01-07 John Marston Symington Fixture for attaching prosthesis to bone
DE3538346A1 (en) * 1985-10-29 1987-05-07 Ingo Kliefoth HIP JOINT PROSTHESIS AND METHOD AND DEVICE FOR YOUR IMPLANTATION
DE3607824A1 (en) * 1986-01-21 1987-09-10 Werner Dr Med Steinleitner Cementless, rotationally stable compression hip endoprosthesis
GB2192543A (en) * 1986-06-13 1988-01-20 Finsbury Peg for use in prosthetic devices
GB2192543B (en) * 1986-06-13 1990-06-27 Finsbury Peg for use in prosthetic devices
US5417533A (en) * 1990-07-13 1995-05-23 National Medical Specialty, Inc. Bone screw with improved threads
US5226766A (en) * 1990-11-27 1993-07-13 Stuart Surgical Bone screw with improved threads
US5120171A (en) * 1990-11-27 1992-06-09 Stuart Surgical Bone screw with improved threads
US5492442A (en) * 1990-11-27 1996-02-20 National Medical Specialty, Inc. Bone screw with improved threads
AU661565B2 (en) * 1992-02-28 1995-07-27 Astra Aktiebolag Hip joint prosthesis
EP1120096A1 (en) * 1992-02-28 2001-08-01 AstraZeneca AB Fixture for a hip joint prosthesis
US5725593A (en) * 1995-02-22 1998-03-10 Caracciolo; Francesco Total anatomic hip prosthesis
DE19610741C1 (en) * 1996-03-20 1997-11-20 Eska Implants Gmbh & Co Internal locking prosthesis for artificial hip-joint
DE19834277A1 (en) * 1998-07-30 2000-02-17 Gamal Baroud Femoral neck endoprosthesis for an artificial hip joint
DE19834277C2 (en) * 1998-07-30 2000-08-10 Gamal Baroud Femoral neck endoprosthesis for an artificial hip joint
WO2000009038A3 (en) * 1998-08-10 2000-09-21 Novarticulate Bv Anchoring means for a joint prosthesis or other component
NL1009832C2 (en) * 1998-08-10 2000-02-11 Novarticulate Bv Hip replacement.
AU771147B2 (en) * 1998-08-10 2004-03-18 Emergomed Limited Anchoring means for a joint prosthesis or other component
WO2001013824A1 (en) * 1999-08-20 2001-03-01 University College London Conservative hip
US7156879B1 (en) * 1999-10-06 2007-01-02 Astra Tech Ab Femur fixture and set of femur fixtures
NL1016551C2 (en) * 2000-11-07 2002-05-14 Erik Leonard Hoffman Fastening element, for hip prosthesis, has plate-shaped supporting element, and hollow pin driven into spongy bone, and secured by fixing plate and openings through which bone can grow
EP1205163A1 (en) * 2000-11-07 2002-05-15 Erik Leonard Hoffman Fastening element for an implant, in particular a hip prosthesis
EP1499268A4 (en) * 2002-04-11 2005-08-31 Theodore Crofford Femoral neck fixation prosthesis
US7104995B2 (en) 2002-04-11 2006-09-12 Crofford Theodore W Method of preparing an acetabulum for receiving a head of a femoral prosthesis
EP1499268A1 (en) * 2002-04-11 2005-01-26 Theodore Crofford Femoral neck fixation prosthesis
US7695474B2 (en) 2002-04-11 2010-04-13 Howmedica Osteonics Corp. Method of preparing an acetabulum for receiving a head of a femoral prosthesis
US7476253B1 (en) * 2004-08-11 2009-01-13 Biomet Manufacturing Corporation Humeral head preserving implant
US7914584B2 (en) 2004-10-21 2011-03-29 Biomet Manufacturing Corp. Prosthesis system with trunnion and removably coupled head
US8801799B2 (en) 2008-07-24 2014-08-12 Howmedica Osteonics Corp. Femoral head prosthesis
US11883081B2 (en) 2020-11-19 2024-01-30 Rtg Scientific, Llc Fastening devices, systems, and methods
US12121276B2 (en) 2021-05-06 2024-10-22 Rtg Scientific, Llc Fastening devices, systems, and methods
US12121271B2 (en) 2021-09-08 2024-10-22 Rtg Scientific, Llc Femoral fixation devices, systems, and methods
WO2023215419A1 (en) * 2022-05-04 2023-11-09 Rtg Scientific, Llc Joint arthroplasty implants and systems

Also Published As

Publication number Publication date
FR2438470A1 (en) 1980-05-09
FR2438470B1 (en) 1982-03-19
ES484932A1 (en) 1980-06-16

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