GB2248395A - Prosthesis assembly and method of fixing a prosthetic component - Google Patents
Prosthesis assembly and method of fixing a prosthetic component Download PDFInfo
- Publication number
- GB2248395A GB2248395A GB9021646A GB9021646A GB2248395A GB 2248395 A GB2248395 A GB 2248395A GB 9021646 A GB9021646 A GB 9021646A GB 9021646 A GB9021646 A GB 9021646A GB 2248395 A GB2248395 A GB 2248395A
- Authority
- GB
- United Kingdom
- Prior art keywords
- prosthetic component
- component
- bone
- pin
- fixing
- 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
Links
- 238000000034 method Methods 0.000 title claims description 11
- 210000000988 bone and bone Anatomy 0.000 claims abstract description 20
- 241001653121 Glenoides Species 0.000 claims abstract description 5
- 210000002303 tibia Anatomy 0.000 claims abstract description 5
- 208000014674 injury Diseases 0.000 claims abstract description 4
- 210000003127 knee Anatomy 0.000 claims abstract description 4
- 230000008736 traumatic injury Effects 0.000 claims abstract description 4
- 101150038956 cup-4 gene Proteins 0.000 abstract description 19
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 210000001624 hip Anatomy 0.000 description 1
- 210000004394 hip joint Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000004197 pelvis Anatomy 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- 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 or setting implements
- 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
- 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 for implanting artificial joints
- A61F2/4603—Special tools for implanting artificial joints for insertion or extraction of endoprosthetic joints or of accessories thereof
- A61F2/4609—Special tools for implanting artificial joints for insertion or extraction of endoprosthetic joints or of accessories thereof of 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
- A61F2/38—Joints for elbows or knees
-
- 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
- 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
- A61F2002/3401—Acetabular cups with radial apertures, e.g. radial bores for receiving fixation screws
- A61F2002/3403—Polar aperture
Landscapes
- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Transplantation (AREA)
- Veterinary Medicine (AREA)
- Surgery (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Public Health (AREA)
- Animal Behavior & Ethology (AREA)
- Molecular Biology (AREA)
- Medical Informatics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Physical Education & Sports Medicine (AREA)
- Neurology (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Vascular Medicine (AREA)
- Prostheses (AREA)
Abstract
A prosthesis assembly 3 comprises a prosthetic component such as an acetabular cup 4, a knee tibia component or a shoulder glenoid component, and a pin 6 held in a bore 5 in the component by for example an interference fit. in order to allow checking of prosthesis orientation before permanent fixing of the cup 4 in the bone recess 1, the pin 6 is driven into the bone 2, e.g. by means of an impactor 8, to provide an initial fixing of the cup. The pin also facilitates subsequent permanent fixing of the prosthetic component. The component may alternatively be a bone plate for a traumatic injury. <IMAGE>
Description
A prosthesis assembly and a method of
fixing a prosthetic component
The present invention relates to a prosthesis assembly and a method of fixing a prosthetic component.
When performing a total joint replacement operation it is standard practice to place the prosthetic component, e.g. the acetabular cup prosthesis for a hip joint, in an initial orientation inside a recess formed in the bone. The acetabular cup is held in place by hand while a trial insert is fitted. The hip is then reduced (i.e.
placed back together) and a range-of-movement test is performed to test for correctness of orientation of the acetabular cup. If the orientation is found to be correct the acetabular cup is then fixed in place, e. g.
by screws or adhesive.
After dislocation of the joint and removal of the insert for final fixing of the acetabular cup it is all too easy to alter the orientation of the acetabular cup accidentally, and the whole process has to be repeated.
Similar problems arise when undertaking other joint prostheses, such as a tibia or glenoid prosthesis, or when treating a traumatic injury requiring bone plates.
An object of the present invention is to provide a prosthesis assembly with which it is possible to avoid accidental reorientation of the prosthetic component before and during its final fixing.
The invention provides a prosthesis assembly as claimed in claim 1.
The invention also provides a method of fixing a prosthetic component to a bone as claimed in claim 9.
An embodiment of the invention will now be described with reference to a prosthesis assembly shown schematically in section by way of example in the accompanying drawing.
In the drawing, a recess 1 has been formed in a pelvis bone 2, and a prosthetic component in the form of an acetabular cup assembly 3 has been inserted into th recess 1. The cup assembly 3 comprises an acetabular cup 4 having a central bore 5 with a countersink 5' into which a pin 6 having a head 6' has been inserted, and is held in place by means of an interference fit 7.
The acetabular cup 4 is held by means of a conventional holding device (not shown), which incorporates a free-sliding impactor 8. When the cup 4 is judged to be in the correct position, the pin 6 is driven into the bone 2 by the impactor 8, so that the head 6' engages the countersink 5', and the pin 6 holds the cup 4 firmly in place. A trial insert (not shown) is then inserted into the cup 4 and the usual range-of-movement tests are performed to determine whether the orientation of the cup 4 is correct. If the cup 4 has been correctly orientated, the insert is removed, but the pin 6 holds the cup 4 in the initial and correct position. The cup 4 is then permanently fixed in the recess 1, e. g. by three or four screws (not shown), by means of adhesive, or by any other suitable means.
If the orientation of the cup 4 is incorrect, the cup assembly 3 can be removed without difficulty. Since the engagement of the pin head 6' in the countersink 5' prevents the pin 5 passing completely through the bore 5, the pin 6 can be withdrawn merely by applying a pulling force to the acetabular cup 4. After removal of the cup assembly 3, the pin 6 is then returned to its initial position, or a new pin can be inserted into the bore 5 to repeat the checking of the orientation of the cup 4 in a new position.
Although a pin 6 held in the bore 5 by an interference fit 7 is preferred, this arrangement could be replaced by any other suitable means, e. g. a screw-threaded pin held in a screw-threaded bore 5.
It is normally sufficient to orientate the cup 4 within 10-15 of the ideal position. Thus, if checking of the orientation shows that the cup 4 has been wrongly oriented, a reorientation of at least 10. will be required so that the hole initially driven into the bone 2 by the pin 6 will not interfere with any subsequent initial fixing of the cup 4 by means of the pin 6.
Various modifications may be made to the embodiment described. Thus, the acetabular cup 4 could be provided with more than one initial-fixing pin 6, i.e. two or more pins. Instead of the acetabular cup 4, the prosthetic component could be a knee tibia component or a shoulder glenoid component. Alternatively, it could be a bone plate for a traumatic injury. In each case the pin or pins allow initial holding of the component for checking orientation and provide holding during final, permanent fixing.
Claims (14)
1. A prosthesis assembly comprising a prosthetic component for fixing to a bone and a pin held in a bore in the prosthetic component and drivable into the bone for initial fixing of the prosthetic component to allow checking of prosthesis orientation and facilitate subsequent permanent fixing of the prosthetic component.
2. A prosthesis assembly as claimed in claim 1, wherein the pin is held in the bore with an interference fit and is drivable into the bone by means of an impactor.
3. A prosthesis assembly as claimed in claim 1 or 2, wherein the end of the bore inside the prosthetic component is recessed to accommodate a head of the pin when fully engaged with the bone.
4. A prosthesis assembly as claimed in any one of the preceding claims, wherein the prosthetic component is an acetabular cup.
5. A prosthesis assembly as claimed in any one of claims 1 to 3, wherein the prosthetic component is a knee tibia component or a shoulder glenoid component.
6. A prosthesis assembly as claimed in any one of claims 1 to 3, wherein the prosthetic component is a bone plate for a traumatic injury.
7. A prosthesis assembly substantially as herein described with reference to the accompanying drawing.
8. A prosthesis comprising a prosthesis assembly as claimed in any one of the preceding claims.
9. A method of fixing a prosthetic component to a bone comprising aligning with the bone a prosthesis assembly comprising a prosthetic component and a pin held in a bore in the prosthetic component and driving the pin into engagement with the bone to provide initial fixing of the prosthetic component so as to allow checking of prosthesis orientation and facilitate subsequent permanent fixing of the prosthetic component.
10. A method as claimed in claim 9, wherein the pin is held in the bore with an interference fit and is driven into the bore by means of an impactor.
11. A method as claimed in claim 9 or 10, wherein the prosthetic component is an acetabular cup.
12. A method as claimed in claim 9 or 10, wherein the prosthetic component is a knee tibia component or a shoulder glenoid component.
13. A method as claimed in claim 9 or 10, wherein the prosthetic component is a bone plate.
14. A method of fixing a prosthetic component to a bone substantially as herein described with reference to the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9021646A GB2248395B (en) | 1990-10-05 | 1990-10-05 | A prosthesis assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9021646A GB2248395B (en) | 1990-10-05 | 1990-10-05 | A prosthesis assembly |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9021646D0 GB9021646D0 (en) | 1990-11-21 |
| GB2248395A true GB2248395A (en) | 1992-04-08 |
| GB2248395B GB2248395B (en) | 1994-12-14 |
Family
ID=10683269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9021646A Expired - Fee Related GB2248395B (en) | 1990-10-05 | 1990-10-05 | A prosthesis assembly |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2248395B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5755806A (en) * | 1996-09-30 | 1998-05-26 | Bristol-Myers Squibb Co. | Method of attaching spikes to an orthopaedic implant |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4172452A (en) * | 1978-05-15 | 1979-10-30 | Howmedica, Inc. | Fracture nail plate assembly |
-
1990
- 1990-10-05 GB GB9021646A patent/GB2248395B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4172452A (en) * | 1978-05-15 | 1979-10-30 | Howmedica, Inc. | Fracture nail plate assembly |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5755806A (en) * | 1996-09-30 | 1998-05-26 | Bristol-Myers Squibb Co. | Method of attaching spikes to an orthopaedic implant |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2248395B (en) | 1994-12-14 |
| GB9021646D0 (en) | 1990-11-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20081005 |