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Publication numberUS3667456 A
Publication typeGrant
Publication dateJun 6, 1972
Filing dateNov 19, 1970
Priority dateNov 25, 1969
Publication numberUS 3667456 A, US 3667456A, US-A-3667456, US3667456 A, US3667456A
InventorsCharnley John
Original AssigneeThackray C F Ltd
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Hip-joint operations
US 3667456 A
Abstract
A method for re-attaching the great trochanter to the femur in which the faces to be joined are shaped respectively by matching male and female reamers so that one fits into the other to create an interlocking action. Suitable male and female reamers, preferably of conical or frusto-conical form are described. together with holders for the reamers.
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Description  (OCR text may contain errors)

United States Patent Charnley 1 June 6,1972

[54] HIP-JOINT OPERATIONS [72] Inventor: John Charnley, Hale, England [73] Assignee: Chas. F. Thackray Limited, Leeds,

Yorkshire, England [22] Filed: Nov. 19, 1970 [21] Appl. No.: 90,914

[30] Foreign Application Priority Data Nov. 25, 1969 Great Britain ..57,539/69 ..128/92 R, 128/305 A6lb 17/16, A61b 17/32 52 us. Cl. 51 1111.0

[58] Field of Search 128/92 R, 92 B, 92 BA, 92 BB,

[ 56] References Cited UNITED STATES PATENTS 2,381,050 8/1945 I-Iardinge ..128/92 BB 2,414,882 1/1947 Longfellow ....l28/92 BB 3,412,733 11/1968 Ross ..l28/305 FOREIGN PATENTS OR APPLICATIONS 549,999 12/1942 Great Britain 128/305 1,020,421 11/1952 France..... ...128/305 1,031,888 3/1953 France ..128/305 OTHER PUBLICATIONS Blount, W. P., Blade-Plate Internal Fixation For High Femoral Osteotomies. Jour. Bone and Joint Surg., Vol. XXV, No.2, pp. 319- 338, Apr. 1943.

Osborne, Geoffrey, An Osteotomy Fixation Plate," The Lancet, Dec. 19, 1964, pp. 1,315- 1,316.

Salenius, Pentti, A New Compression Plate for the McMurray Displacement Hip Osteotomy." Jour. Bone & Joint Surg., Vol. 52 A, No. 2, March 1970, pp. 382- 383.

Primary Examiner--Channing L. Pace Attorney-Stevens, Davis, Miller & Mosher ABSTRACT A method for re-attaching the great trochanter to the femur in which the faces to .be joined are shaped respectively by matching male and female reamers so that one fits into the other to create an interlocking action. Suitable male and female reamers, preferably of conical or frusto-conical form are described. together with holders for the reamers.

5 Claims, 6 Drawing Figures PATENTERJUN (H972 3,667,456

SHEET 1G? 2 PATEMTEUJUH 6:912 3.667.456

SHEET 28F 2 HIP-JOINT OPERATIONS This invention relates to techniques of hip-joint surgery, and to apparatus for use in such techniques.

A well-known procedure in the surgery of the hip-joint, used to gain access to the interior of this joint, is to cut the great trochanter away from the bone of the femur, elevate it together with its attached muscles, and thereafter proceed with the operation inside the joint. At the end of the operation the detached trochanter has to be re-attached to the bone, preferably in a position slightly more lateral to its original site.

The known method of re-attachment involves fixing together two flat surfaces of contact by mechanical fixing means such as screws, nails, staples or wire in various forms, and such methods are a source of great dissatisfaction in hipjoint surgery. There is a strong tendency for the trochanter to become detached, since this can rotate on the flat surface of the femur and so strain the mechanical fixing means, and for a fibrous union to occur between the trochanter and the femur.

From a first aspect the invention comprises a method of reattaching the great trochanter to the femur in which the faces to be joined are shaped respectively by matching male and female reamers so that one fits into the other to create an interlocking action.

From another aspect, the invention provides apparatus for use in hip-joint surgery, the apparatus comprising a pair of reamers, one having a male working surface and the other a female working surface, the surfaces of the reamers matching so that reamed surfaces produced by the reamers will be a close fit one within the other.

In use, preferably the female reamer is used to fashion a male surface on the femur, and the male reamer is used to fashion a female surface on the detached trochanter. Thus, when the parts are reunited a spigot will enter a socket to give an improved mechanical engagement. This interlocking of the bones is considered to protect the mechanical means fixing the bones together, both from strain and from cutting out of the bone. Furthermore, the reamed surfaces provide a much larger contact area between raw bone than is available with previous methods where the surfaces tend to touch only at three or four points.

Preferably each working surface is generally conical or frusto-conical, and is provided with teeth over a substantial part of the surface. In the reamer with the female working surface the conical or frusto-conical surface conveniently ends in a rim, chamfered to the same angle as the working surface and provided with a number of cutting teeth formed axially of the conical or frusto-conical surface.

The cone angle is preferably obtuse. However, the angle may be a right angle or an acute angle. Forms other than conical or frusto-conical may be used, and the arrangement of teeth on the working surfaces may take any one of a number of forms.

The reamers may be designed to be mounted in a manually tumable T-shaped handle, or to be mounted on a light weight brace.

An embodiment of male and female reamers according to the invention will now be described in more detail, by way of example only, with reference to the accompanying drawings in which:

FIGS. 1 and 2 are a cross section and end elevation respectively of a male reamer;

FIGS. 3 and 4 are a cross section and end elevation respectively of a female reamer;

FIG. 5 shows a handle for the reamers to a reduced scale; and

FIG. 6 shows alternative mounting means, again to a reduced scale.

As shown in FIGS. 1 and 2 a male reamer has a generally has an axial hole 5 formed at one end thereof, and provided with an internal screw thread 6. The cone angle, that is the angle a, is 1 10.

FIGS. 3 and 4 show a female reamer for use in conjunction with the male reamer of FIGS. 1 and 2. This female reamer has a generally conical working surface 10, again having a cone angle B of 1 10. Rasp teeth 1 1 are formed over the full face of the cone, and are similar in form to the teeth on the male reamer. The surface 10 ends in a rim l2, chamfered at 13 to the same angle as the surface 10, and the rim is interrupted at intervals by grooves 14 to form upstanding teeth 15 extending axially of the conical surface. The base 16 of the reamer is formed with an axial bore 17, provided with an internal screw thread 18.

The cone angles and tooth arrangement on the male and female reamers are similar, and accordingly when one is used on the trochanter and one on the femur the bones will be shaped to matching socket and spigot formations which will be a close fit one within the other.

It will be appreciated that the cone angle may be varied as desired, as may the formation and arrangement of the teeth. The reamers need not be conical, but may be cylindrical or have matching curved working surfaces. The working surfaces should be substantially a surface of revolution about the axis, but deformed by the teeth. The teeth are preferably made by actual working of the conical surface, but if desired a toothed lining material may be secured to a smooth base surface.

FIG. 5 shows a handle with which either reamer may be associated. The handle has a stem 20 temiinating at one end in a cross piece 21 and at the other in an externally screw threaded part 22 which can mate with the threads 6 or 18 of either the male or female reamer. The reamer may thus be rotated to cut the bone by manual rotation of the cross piece 21 about the axis of the stem 20.

Alternatively either reamer may be used in conjunction with a light weight brace, when a holder as shown in FIG. 6 may be employed. This holder has an end 30 threaded to engage the threads 6 or 18 of either the male or female reamer. At the other end of a stem 31 is a sleeve 32 formed with a slot 33. The sleeve may fit on to the end of a light weight brace and be locked in position by a locking screw 34 threadably engaging the end 35 of the slot 33.

It will be appreciated that other forms of holder for the reamers may be designed, and the reamers themselves may have mounting means other than the threaded holes described.

What I claim is:

1. A method of re-attaching the great trochanter to the femur comprising the steps of shaping a face of said great trochanter and a face of said femur one by a male reamer and the other by a female reamer to form complementary socket and spigot formations; placing said faces one on the other so that said socket and spigot formations interlock; and mechanically securing said great trochanter and femur in their relative positions with said formations interlocked.

2. A method as claimed in claim 1 wherein said socket and spigot formations are of conical form.

3. A method as claimed in claim 1 wherein said socket and spigot formations are of frusto-conical form.

4. A method as claimed in claim 1 wherein said spigot formation is formed on said femur and said socket formation is formed on said great trochanter.

5. A method as claimed in claim 2 wherein said cone is of obtuse angle.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2381050 *Dec 4, 1943Aug 7, 1945Mervyn G HardingeFracture reducing device
US2414882 *Sep 24, 1943Jan 28, 1947Herschel Leiter HFracture reduction apparatus
US3412733 *Jul 1, 1966Nov 26, 1968Zimmer Orthopaedic LtdAcetabulum reamer
FR1020421A * Title not available
FR1031888A * Title not available
GB549999A * Title not available
Non-Patent Citations
Reference
1 *Blount, W. P., Blade Plate Internal Fixation For High Femoral Osteotomies. Jour. Bone and Joint Surg., Vol. XXV, No. 2, pp. 319 338, Apr. 1943.
2 *Osborne, Geoffrey, An Osteotomy Fixation Plate, The Lancet, Dec. 19, 1964, pp. 1,315 1,316.
3 *Salenius, Pentti, A New Compression Plate for the McMurray Displacement Hip Osteotomy. Jour. Bone & Joint Surg., Vol. 52 A, No. 2, March 1970, pp. 382 383.
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4004581 *Sep 9, 1975Jan 25, 1977Friedrichsfeld GmbhTool for forming a bed in a hip bone to receive an artificial acetabulum
US4023572 *Aug 5, 1975May 17, 1977Hanfried WeigandMilling tool for preparing a joint socket in the prosthetic replacement of a joint
US4116200 *Oct 1, 1976Sep 26, 1978Aesculap-Werke Aktiengesellschaft Vormals Jetter & ScheererMilling tool for surgical purposes
US4284080 *May 29, 1979Aug 18, 1981Orthoplant Orthopadische Implantate Gmbh & Co. KgApparatus for the working of a bone which is to be provided with a shell prosthesis
US4587964 *Feb 5, 1985May 13, 1986Zimmer, Inc.Rasp tool
US4834748 *Sep 29, 1987May 30, 1989Allergan, Inc.Method and apparatus for removing corneal tissue
US5035699 *Jan 9, 1990Jul 30, 1991Dow Corning WrightPatella track cutter and guide
US5549613 *Sep 15, 1993Aug 27, 1996Mitek Surgical Products, Inc.Modular surgical drill
US5643270 *Aug 3, 1995Jul 1, 1997Combs; C. RobertMulti-plane curvilinear saw, guide and method
US5709688 *Jun 7, 1995Jan 20, 1998Othy, Inc.Acetabular reamer cup and method of producing the same
US5824099 *Oct 24, 1996Oct 20, 1998Mendes; DavidSurgical method and tool for repairing a patella of the knee joint
US5895388 *Jun 18, 1997Apr 20, 1999Zobel; Robert A.Method and apparatus for smoothing an anatomical joint bearing surface during hemi-joint replacement
US5954727 *Oct 29, 1993Sep 21, 1999Howmedica Inc.Acetabular cup positioning tool and method of positioning an acetabular cup
US6409732Jul 9, 1999Jun 25, 2002Othy, Inc.Tool driver
US6428543Aug 13, 1999Aug 6, 2002Othy, Inc.Acetabular reamer cup and method of producing the same
US20060015111 *Mar 31, 2005Jan 19, 2006Gary FentonReamer assembly
US20100160916 *Sep 25, 2007Jun 24, 2010Gursharan Singh ChanaCuttting device
WO2008037984A2 *Sep 25, 2007Apr 3, 2008Comis Orthopaedics LimitedCutting device
WO2008037984A3 *Sep 25, 2007Jul 17, 2008Comis Orthopaedics LtdCutting device
WO2009071937A1 *Nov 28, 2008Jun 11, 2009Depuy International LtdAn instrument
Classifications
U.S. Classification606/81, 606/89
International ClassificationA61B17/16
Cooperative ClassificationA61B17/1668, A61B17/1666
European ClassificationA61B17/16S2F, A61B17/16S2C