Invention (Patent): Pellet LL. Hip arthroplasty with flexible securing means US2765787 (1956).
US2765787A United States
Inventor: Leon L Pellet
Current Assignee: Individual
Worldwide applications 1954 US
Application US447107A events:
1954-08-02 Application filed by Individual
1954-08-02 Priority to US447107A
1956-10-09 Application granted
1956-10-09 Publication of US2765787A
1973-10-09 Anticipated expiration
Status: Expired - Lifetime
HIP ARTHROPLASTY WITH FLEXBLE SECURING MEANS
Leon L. Pellet, Dallas, Tex.
Application August 2, 1954, Serial No. 447,107
19 Claims. (C. 128-92)
This invention relates to a method and means for
treating subcapital fractures of the femur.
Subcapital fractures of the femur, i. e.
fracture of the neck of the femur between the head and the trochanter of the
femur, occur frequently in elderly people because the bone structure of the
femoral neck becomes porous and weak with age. Further, sometimes, as a result
of aseptic necrosis occurring after a dislocation or for some other reason, and
in some instances of arthritic spurs on the femoral head, it is necessary or
desirable to replace the femoral head. Hip prostheses of various types are
known which are secured to the femur after the femoral head is removed and
which provide a head that fits in the "acetabulum of the os coxae to
permit articulation of the hip joint. Such a conventional hip prosthesis is not
provided with any means for locking the prosthesis in the acetabulum of the os
coxae and in the shaft of the femur so that the hip of the patient must be
immobilized for a period of several weeks after the prosthesis is fixed to the
femur to permit healing of the ligaments and muscles which are required to hold
the members of the hip joint in normal conjugated position. During this period
of immobilization, the forced inactivity of the elderly patient often results
in urinary tract irritations or infections, decubitus ulcers, paralytic ileus,
hypostatic pneumonia, phlebothrombosis, and even malnutrition. It is desirable,
therefore, that a hip prosthesis be provided which will permit early and
continuous free unhampered movement of the patient, such as turning and sitting
up and very early ambulation, even the day of, or the day after, the operation.
It has also been noted that present conventional
hip prostheses are usually driven into the shaft of the femur after the femoral
head is removed, the fixation of the prosthesis being dependent upon its tight
fit in the femur. As a result, the operator in attemptinga firm fixation of the
prosthesis in the neck and/or in the shaft of the femur drives the prosthesis
in so rigorously that splitting of the femoral neck, the trochanter or the
shaft sometimes occurs.
The bone texture in the area frequently is very
thin and porous due to the age of the patient or marked atrophy of disuse.
Adequate drilling or reaming of the neck or shaft in the poor texture bone
frequently results in the prosthesis being too loose after it is seated.
Dislocation of the prosthesis is then apt to occur.
Accordingly, it is desirable that a hip
prosthesis be provided which does not have to be driven into the neck or shaft
of the femur for a tight fit but may be merely snugly or slightly loosely
fitted therein, which can be locked into the acetabulum of the os coxae to
prevent dislocation of the head of the prosthesis therefrom, and which can be
locked into the shaft of the femur to prevent dislocation of the stem of the
prosthesis from the femur or rotation of the stem therein.
It is therefore an object of the invention to
provide a new and improved method for treating fractures of the femur and for
replacing the femoral head which permits Met early movement and ambulation of
the patient after the fixation of a hip prosthesis to the femur.
Another object of the invention is to provide a
new and improved hip prosthesis.
Still another object is to provide a new and
improved hip prosthesis having means for locking the head of the prosthesis in
the acetabulum.
A further object is to provide a new and
improved hip prosthesis, of the type described, having means for locking the
stem of the prosthesis to the shaft of the femur into which it is inserted.
A still further object is to provide a hip
prosthesis, of the type described, whose stern need not have a tight fit in the
neck or shaft of the femur.
Additional objects and advantages of the
invention will be readily apparent from the reading of the following
description of devices constructed in accordance with the invention and
reference to the accompanying drawings thereof, wherein:
Figure l is a partly sectional view of one form
of the hip prosthesis of the invention showing it in place secured in operative
position to the 0s coxae and the femur of a hip joint;
Figure 2 is a front view of the hip prosthesis
shown in Figure 1;
Figure 3 is a sectional view taken on the line
3-3 of Figure 2;
Figure 4 is a perspective view of the T bar
which locks the head of the prosthesis in the acetabulum;
Figure 5 is a partly sectional view of another
form of the hip prosthesis of the invention showing it in place secured in
operative position to the 0s coxae and the femur of a hip joint;
Figure 6 is a perspective view of the hip
prosthesis shown in Figure 5;
Figure 7 is a side view of one of the
symmetrical spacer washers of the hip prosthesis shown in Figures 5 and 6,
Figure 8 is a side view of one of the
asymmetrical washers of the hip prosthesis shown in Figures 5 and 6;
Figures 9 and 10 are top views of the washers
shown in Figures 7 and 8, respectively.
Referring now particularly to Figures 1 to 4 of
the drawing, the hip prosthesis 20 includes a femur
section 21 and an acetabulum lock 22. The femur
section 21 of the prosthesis includes a stem 23 which curves
downwardly from a neck flange 24 and whose lower portion is fluted to
provide four longitudinal flanges 25 which are notched transversely
to provide broach teeth 26. The curvature of the stem corresponds to
the curvature of the medullary canal 27 of the femur 28.
The neck flange 24- is designed to abut the
upper remaining portion 29 of neck of the femur to limit inward
movement of the stem 21 into the medullary canal of the femur.
The femur section 21 also includes
a neck 30 which extends angularly upwardly from the neck flange and
which is provide-d with a substantially ball shaped head 31 which, it
will be noted, corresponds to the head of a normal femur and which seats in
the acetabulum 32 of an 03 coxae 33. The head is provided
with a bore 34 which extends therethrough substantially
perpendicularly to the longitudinal axis of the stem 23.
The bore 34 is enlarged or flared outwardly as at 35 toward the
interior portion of the head 31 to permit normal movement of the head
in the acetabulum, which would otherwise be restricted by the flexible
retaining member or wire 36 which extends through
the bore 34.
Th flexible member or stranded wire 36
is preferably of stainless steel and is looped through the transverse
bore 37 of a rod 38 arranged to extend into a hole 39
drilled in the os coxae which communicates with the socket
or acetabulum 32. The rod 38 extends through an aperture in
a flat rectangular keeper member 4! and is prevented from passing therethrough
by a flange 41 on the end of the rod remote from
the ball 31. It will be noted that the keeper member 49
and rod 38 form a T bar, the leg 38 of which extends into
the hole 39 of the s coxae while the cross member 40
thereof abuts the interior surface of the 0s coxae to limit the movement of
the leg 38 through the hole 39.
The flexible member passes from
the rod 38 through the hole 39 of the os coxae,
the bore 34 of the head and through one of the slots 42 of
the neck flange 28 to extend along the exterior of the shaft of the
femur. The free ends of the flexible member extend into the socket 43
of a connector 44 and are secured therein by crimping, swaging or in any other
convenient manner. The connector has a flat apertured portion 45
which abuts the femur and through which a screw 46 may extend into
and through transverse holes drilled in the femur. The holes are so drilled
that the screw 46 passes through one of the notches 47 between
the broach teeth 26 and thus prevents either longitudinal or rotary
movement of the stem 23 in the medullary canal of the femur in
addition to securing the flexible member to the femur.
The prosthesis is secured in place by the
following operative technique. The hip joint having the sub capital fracture of
the femur or from which the head of the femur is to be removed may be exposed
by any suitable approach, although an L-shaped incision on the lateral side of
the trochanter 48 and upper shaft of the femur 28 is
suggested. The upper end of the incision is tailed toward the iliac crest to a
point approximately seven centimeters behind the anterior superior spine and three
centimeters below the iliac crest.
The femoral head is then removed by any suitable
means, such as a lion jawed femur holding forceps. All capsule structure which
can be reached is removed and the round ligament remnants are then removed from
the acetabulum.
The hole 39 is then drilled through
the es coxae in the superior center portion of the acetabulum just inferior to
the joint cartilage. This hole 39, which is preferably about inch in
diameter, should be disposed where the superior attachment of the round ligament
had been located.
A curved forceps, preferably a tonsil or common
bile duct right angle forceps, is passed around the hole 39 inside
the pelvis in order to loosen the adjacent muscle attachment.
The flexible member 36 and
the lock 22 are then passed into the pelvis with the curved forceps,
the flexible member being passed through the hole 3 in the 0s coxae and the
keeper member pushed into the position shown in Figure 1. A pull is exerted on
the flexible member to insure that the keeper is locked in position. The free
end of the flexible member is then attached to the drapes by a wire (not shown)
or any other suitable means to hold it out of the way for succeeding
operations.
Any remaining superior part of the neck of the
femur is then removed. The flexible member 36 is next passed through
the hole 34 in the head 31 of the prosthesis and
the stem 23 of the prosthesis is inserted in the medullary canal of
the femur by several breaching type movements imparted to the stem. Antiversion
or retroversion of the neck 30 of the prosthesis is obtained by so
inserting the stem in the femur. After the prosthesis is seated firmly in the
femur, the flexible member is pulled taut.
An assistant then makes traction on the leg
gradually internally rotating the leg while the operator keeps the chain, cable
or other flexible member taut until the head 31 of the prosthesis is
reduced or seats in the socket or acetabulum 32. The flexible member
is then pulled taut, then passed through the slot 24 in the flange 28
and anchored with the screw 46 which passes through a hole previously
drilled in the shank of the femur. Sufficient slack is left in the flexible
member to permit normal movement of the femur. The hole through which
the lock screw 46 passes is so drilled that the screw passes through
a notch 47 between two of the breach teeth 26. The drill is directed
obliquely through the femur while the hole is drilled and a notch 47 can be
felt for as the drill passes through the femur.
When the lock screw is secured in place,
the stem 23 is locked in the medullary canal of the femur against any
movement. Simultaneously, the flexible member 36 and the keeper
section 22 lock the head 31 of the femur section 21 of
the prosthesis in the acetabulum although the head is free for normal rotary
movement therein.
The incision is then closed.
Since the femur is thus locked to the os coxae
by means of the lock section and the flexible member 36, the patient
need not be immobilized for several weeks until the ligaments and muscles of
the hip joint have healed to hold the prosthesis head 31 in the
acetabulum. The patient can move his leg immediately after the operation and
walk the next morning since the head 31 is held in place by
the lock section 22 and the flexible member.
The advantages of the above desirable
prosthesis, which permits early ambulation, over conventional prosthesis which
requires immobilization of the patient for several weeks are quite obvious. No
cast or splinting is necessary, no special nursing precautions are necessary,
little or no narcotics are needed, and mental depression is minimized.
Another form of the prosthesis is illustrated in
Figures 5 to 10, wherein the prosthesis 48 includes a lock section 49
and a femur section 50. The lock section 49 is similar to
the lock section 22 shown in Figure 1 and includes a keeper
member 51 and a rod 52 rotatably connected to the keeper.
A flexible member 53 which may be in the form of a chain of stainless
steel is secured to the exterior end of the rod 52, though the
stranded wire may be used.
The femur section includes a stem 54
provided at its upper end with a substantially ball shaped head 55.
The head 55 is provided with a transverse bore 56, having
an inwardly directed flared or enlarged portion 57, through which the
chain or flexible member 53 may pass. The head is undercut around the
upper straight neck portion 58 of the stem to form an annular
recess 59 with which the outer end of the bore 56 communicates.
Symmetrical washers 6tl having a uniform thickness and asymmetrical
washers 61 having a non-uniform or tapered thickness are disposed on the
upper straight neck portion of the stem with the topmost washer being received
in the annular recess 59 in the head. The symmetrical washers have a
single side bore 62 which is aligned with the bore 56 of the head so
that the chain or flexible member may pass through the bore 56 in the
head and through the side bore 62 of the symmetrical washer or washers disposed
there beneath. The stem 54, of course, extends through
the central bore 63 of the symmetrical washers. The asymmetrical
washers have two side bores 64 and 65 disposed on opposite sides of
the central bore 66 with the side bore 64 disposed in the thinnest
portion of the washer. The provision of asymmetrical washers enables
the ball 55 to be selectively set at desired angles with respect to
the femur 28. A side portion of the straight portion 58 of
the stem may be removed, as at 76, to avoid undesired contact with the inner
side of the femur adjacent the neck.
The lower portion 67 of the, stem is
reduced and is curved toward the head so that its lower end will extend
outwardly from the medullary canal to the exterior of the inner or medial side
of the femur, being passed through an upwardly and inwardly
extending hole 63 drilled in the femur. A washer 6,9 and
a nut 70 threaded on the lower end of the stem secure the stern in
place in the femur. A lock screw 71 passes through the lowermost link
of the flexible member 53 and through suitable holes drilled in the
femur. This secures the flexible member to the femur and thus locks
the head 55 in the acetabulum 31 of the os coxae since the
other end of the flexible member is secured to the rod 52 of the lock
section 49, disposed in the hole 39 drilled in the os coxae.
The operative technique for installing the
locking section and flexible member is the same as that for the form previously
described, but in this form of the prosthesis the femur section 50 is
secured to the femur by drilling a inch hole obliquely down the superior
portion of the neck toward the junction of the shaft and neck in the general
direction of the lesser trochanter 72 of the femur. A selected number
of symmetrical and asymmetrical Washers are then disposed on
the stem 54, the number and shapes of the washers depending upon the
amount and shape of the remaining neck of the femur. The orientation of the
asymmetrical washers on the stem can be adjusted to the angle of the top
surface 73 of the remaining portion of the neck of the femur so as to position
the head 55 properly with respect to the femur.
The femur section of the prosthesis is then
placed adjacent the femur with the edge of the lowermost spacer washer resting
on top of the remaining femoral neck with the stem disposed exteriorly of the
medullary canal to indicate or mark the sight for the hole 68 in the
lesser trochanter area of the femur. The hole 68 is then drilled by
first drilling at a right angle to the shaft of the femur and then angling the
drill upwardly using lower reduced portion 67 of the stem as a
directional guide for the drill. If any antiversion or retroversion of the
femur is desired, the hole 68 should be drilled more to the lateral
or medial side, respectively, of the femur. A 15 or 20 degree antiversion is
usually desirable.
In order to allow the flexible
member 53 to pass the anterior superior part of the neck of the femur
without binding against the femur, a small groove 74 is ronguered in
this area of the femur.
A wire which is secured to the free end of
flexible member is then passed through the bore 56 of the head 55
and through aligned side bores of the spacer washers. The lower curved end
portion of the stem 54 is inserted into the medullary canal and is
then passed out through the hole 68. The washer 69 and nut
7 0 are then disposed on the reduced portion 67 of the stem and the
nut is rotated by means of a wrench or pliers until the washer presses snugly
against the femur. The excess portion of the stem projecting outwardly of the
nut is cut off with a pin cutter and the remaining exposed threads are mutilated
with the side of an osteotome mallet to prevent the nut from unscrewing.
The flexible member 53 is then pulled
taut through the bore 56 of the head and the side bores of the spacer
washers while an assistant makes traction and gradually rotates the femur inwardly
to reduce or seat the head 55 in the acetabulum 31. A hole
is then drilled in the femur to receive the lock screw 71 and the
screw is passed through a link of the flexible member and into this hole to
rigidly secure the lower end of the flexible member to the femur. Sufficient
slack is left in the flexible member to permit normal movement of the femur
relative to the acetabulum. Excess links of the flexible member are cut off
with a pin cutter.
The incision is then closed.
It will now be seen that a new and improved
prosthesis has been provided having a lock section and a femur section, the
lock section having a flexible member which extends through a bore in the head
of the femur section and connects the lock section to the femur. In one form of
the prosthesis the flexible member is secured to the femur by a lock screw
which passes through a notch in the stem femur. In another form of the
prosthesis, the stem of the femur section extends outwardly the medullary canal
through a hole drilled in the femur and is secured to the femur by a nut
threaded on the stem. It will be noted that in both forms of the prosthesis,
the head of the prosthesis is locked against dislocation from the acetabulum by
the locking section and the flexible member. In each form the head of the
prosthesis is locked against dislocation from the acetabulum and the stem of
the prosthesis is locked against movement with respect to the femur.
It will also be apparent that a new method of
treating fractures of the femur or for replacing the femoral head has been
described which includes removing the femoral head from the acetabulum, forming
a hole in the os coxae, placing a keeper member against the os coxae on the
interior side opposite the acetabulum, passing a flexible member connected to
the keeper member through the hole, inserting a stem of a femur prosthesis
provided with a head downwardly into the medullary canal of the femur, securing
the flexible member to the femur, and securing the stem of the femur prosthesis
against Withdrawal from the medullary canal.
It will of course be apparent that the principal
function of the flexible members is to prevent dislocation of the prosthesis
head from the acetabulum during the first few weeks after the operation and
that when the ligaments and muscles of the hip joint heal and strengthen, these
ligaments and muscles will serve to prevent dislocation.
The foregoing description of the invention is
explanatory only, and changes in the details of the constructions illustrated
and the methods described may be made by those skilled in the art, within the
scope of the appended claims, without departing from the spirit of the
invention.
What I claim and desire to secure by Letters
Patent is:
l. A prosthesis for hip joints including: a
femur section having a stem insertable downwardly in the medullary canal of a
femur, a head on the upper end of said stem receivable in the acetabulum of the
os coxae of the hip joint, said head having a bore extending substantially
perpendicularly to the longitudinal axis of the femur; locking means securable
to said os coxae; and a flexible member connected to said locking means and
extending through said bore, said flexible member being connectable to said
femur whereby said head may be held against dislocation from the acetabulum.
2. A prosthesis for hip joints including: a
femur section having a stem insertable downwardly in the medullary canal of a
femur, a head on the upper end of said stem receivable in the acetabulum of the
os coxae of the hip joint, said head having a bore extending substantially
perpendicularly to the longitudinal axis of the femur; a locking section
attachable to said os coxae; a flexible member connected to said locking
section and extending through said bore, said flexible member being connectable
to said femur whereby said head may be held against dislocation from the
acetabulum; said stern having a plurality of broach teeth; and a connecting
member connected to said flexible member and extendable transversely through
said medullary canal for engaging said broach teeth to lock said stem to the
femur.
3. A prosthesis for hip joints including: a
femur section having a stem insertable downwardly in the medullary canal of a
femur, a head on the upper end of said stem receivable in the acetabulum of the
os coxae of the hip joint, said head having a bore extending substantially
perpendicularly to the longitudinal axis of the femur; a locking section
attachable to said os coxae; a flexible member connected to said locking
section and extending through said bore, said flexible member being connectable
to said femur whereby said head may be held against dislocation from the
acetabulum; said stem having a plurality of broach teeth; and a connecting
member connected to the other end of said flexible member and extendable
transversely through said medullary canal for engaging said broach teeth to
lock said stem to the femur; and a lateral flange .on said stern between said
broach teeth and said head for limiting movement of said stem into said femoral
canal, said flange having a notch for receiving said flexible member.
4. A hip prosthesis comprising: an elongate
stern having an upwardly and outwardly extending upper end neck portion; and a
substantially ball shaped head on said upper end neck portion, said ball having
a bore extending angularly with respect to the longitudinal axis of said stem
through said head for receiving a flexible member, said bore having an enlarged
portion remote from said stem.
5. A hip prosthesis comprising: an elongate stem
having an upwardly and outwardly extending upper end portion; and a
substantially ball shaped head on said upper end portion, said ball having a
bore extending angularly with respect to the longitudinal axis of the upper end
portion of said stem through said head for receiving a flexible member, said
bore having an enlarged portion remote from said stern, said stern having a
reduced lower end curved in the direction of said head, said lower end being
threaded to receive a nut.
6. A hip prosthesis comprising: an elongate stem
having an upwardly and outwardly extending neck portion; a substantially ball
shaped head on said neck portion, said ball having a bore extending angularly
with respect to the longitudinal axis of the neck portion of said stem through
said head for receiving a flexible member, said bore having an enlarged portion
remote from said stem; and a plurality of spacer washers on said neck portion
of said stern, said spacer washers each having a central bore for receiving
said stern and a side bore communicating with said bore of said head for
receiving said flexible member.
7. A hip prosthesis comprising: an elongate
stern having an upwardly and outwardly extending upper end neck portion; a
substantially ball shaped head on said upper end neck portion, said ball having
a bore extending angularly through said head with respect to the longitudinal
axis of the neck portion of said stern for receivin a flexible member, said
bore having an enlarged portion remote from said stern, said stem having a
reduced lower end curved in the direction of said head, said lower end being
threaded to receive a nut; and a plurality of spacer washers on said upper end
neck portion of said stem, said spacer washers each having a central bore for
receiving said stem and a side bore communicating with said bore of said head
for receiving said flexible member.
8. A hip prosthesis comprising: an elongate stem
having an upwardly and outwardly extending upper end portion; a substantially
ball shaped head on said upper end portion; a flexible securing member; said
ball having a bore extending angularly through said head with respect to the
longitudinal axis of the upper end portion of said stem and receiving said
flexible member, said bore having an enlarged portion remote from said stem;
and a keeper member secured to the end of said flexible member remote from said
stem.
9. A hip prosthesis comprising: an elongate
stern having an upwardly and outwardly extending upper end neck portion; an
elongate flexible member; a substantially ball shaped head on said upper end
neck portion, said ball having a bore extending angularly through said head
with respect to the longitudinal axis of the neck portion of said stern and
receiving said flexible member, said bore having an enlarged portion remote
from said stem, said stem having a reduced lower end curved in the direction of
said head, said lower end being threaded to receive a nut; and a keeper member
secured to the end of said flexible member remote from said stem.
10. A hip prosthesis comprising: an elongate
stem having an upwardly and outwardly extending upper end neck portion; an
elongate flexible member; a substantially ball shaped head on said upper end
neck portion, said ball having a bore. extending angularly through said head
with respect to the longitudinal axis of the neck portion. of said stem and
receiving said flexible member, said bore having an enlarged, portion remote
from said. stem; a plurality of spacer washers on said upper end neck portion
of said stem, said spacer washers each having a central bore for receiving said
stem and a side bore communicating with said bore of said head for receiving.
said flexible member; and a keeper member secured to the end of said flexible
member remote from said stem.
11. A hip prosthesis comprising: an elongate
stem-having an upwardly and outwardly extending upper end portion; a
substantially ball shaped head on said upper end portion, said ball having a
bore extending angularly through said head with respect to the longitudinal
axis of the upper end portion of said stern for receiving a flexible member,
said bore having an enlarged portion remote from said stem; and a plurality of
spacer washers on said upper end portion of said stem, said spacer washers
each, having a, central bore for receiving said stem and a side bore
communicating with said bore of said head for receiving said flexible member,
at least one of said washers having non-parallel sides and a. second side bore
oppositely disposed to said first mentioned side bore.
12. A hip prosthesis comprising: an elongate
stem having an upwardly and outwardly extending upper end portion; and a
substantially ball shaped head on said upper end portion, said ball having a
bore extending angularly through said head with respect to the longitudinal
axis of the upper end portion of said stern for-receiving a flexible member,
said bore having an enlarged portion remote from said stem, said stem having a
lower end portion provided with a plurality of longitudinal rows of breach
teeth.
13. A hip prosthesis comprising: an elongate
stem having an upwardly and outwardly extending upper end portion; a
substantially ball shaped head on said upper end portion, said ball having a
bore extending angularly through said head with respect to the longitudinal
axis of said stern for receiving a flexible member, said bore having an
enlarged portion remote from said stem, said stern having a lower end portion
provided with a plurality of longitudinal rows of broach teeth; and a lateral
flange on said stem between said ball and said lower end portion, said flange
having a lateral slot for receiving said flexible member.
14. A hip prosthesis comprising: an elongate
stem having an upwardly and outwardly extending upper end portion; a
substantially ball shaped head on said upper end portion; a flexible securing
member; said ball having -a bore extending angularly through said head with
respect to the longitudinal axis of the upper end portion of said stern and
receiving said flexible member, said bore having an enlarged portion remote
from said stem, said stern having a lower end portion provided with a plurality
of longitudinal rows of broach teeth; a lateral flange on said stem between
said ball and said lower end portion, said flange having a lateral slot for
receiving said flexible member; and a keeper member secured to the end of said
flexible member remote from said stem.
15. A prosthesis for hip joints including: an
elongate stem having an angularly disposed neck, a ball shaped head on said
neck, and flexible securing means connected with the head of the prosthesis and
having means for connecting it with the os coxae to hold the head in movable
conjugated position in the acetabulum.
16. A prosthesis for hip joints including: a
body adapted to be mounted on the upper end of a damaged femur, said body
having a substantially ball-shaped surface adapted to be disposed in the
acetabulum of the os coxae of the hip joint, said body having a bore extending
transversely of the ball surface of the body and having one end adapted to lie
in the acetabulum socket, and its other end terminating at a point on the body
adjacent the upper end of the femur; locking means securable to said os coxae;
and a flexible member connected to said locking means and extending through the
bore of said body and being connectable to said femur whereby the ball surface
of the body may be held against dislocation from the acetabulum.
17. A prosthesis of the character set forth in
claim 16 wherein the bore extending transversely of the body is flared
outwardly at the end adapted to lie in the acetabulum socket.
18. A prosthesis for hip joints including: a
body having means for mounting it on the upper end of a damaged femur, said
body having a substantially ball-shaped surface adapted to be disposed in the
acetabulum of the os coxae of the hip joint; and means providing a passageway
extending substantially transversely of said body from a point adapted to lie
Within the acetabulum socket to a point adjacent the upper end of the femur.
19. A prosthesis for hip joints including: a
body having means for mounting it on the upper end of a damaged femur, said
body having a substantially ball-shaped surface adapted to be disposed in the
acetabulum of the os coxae of the hip joint; means providing a passageway ex tending
substantially transversely of said body from a point adapted to lie within the
acetabulum socket to a point adjacent the upper end of the femur; and a
flexible Securing member disposed in said passageway and having means for
securing it at one end to the os coxae and at its other end to the femur.
References Cited in the file of this patent
UNITED STATES PATENTS
2,612,159 Collison Sept. 30, 1952
FOREIGN PATENTS
493,526 Belgium May 16, 1950
OTHER REFERENCES
The Journal of Bone & Joint Surgery for
October 1951, advertising page 12.
The Journal of Bone & Joint Surgery for
January 1952, advertising page 4.
(Copies in Scientific Library.)
External links
Pellet LL. Hip arthroplasty with flexible
securing means. US2765787A August 2, 1954. 1956. patents.google
Authors & Affiliations
Leon L Pellet - US, Dallas, Tex.
Keywords
ligamentum capitis femoris, ligamentum teres, ligament
of head of femur, endoprosthesis, prosthesis,
invention, unipolar, subtotal
NB! Fair practice / use: copied for the purposes of criticism, review, comment, research and private study in accordance with Copyright Laws of the US: 17 U.S.C. §107; Copyright Law of the EU: Dir. 2001/29/EC, art.5/3a,d; Copyright Law of the RU: ГК РФ ст.1274/1.1-2,7
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