US2570465A - Means for fixation of hip fractures - Google Patents

Means for fixation of hip fractures Download PDF

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US2570465A
US2570465A US10797049A US2570465A US 2570465 A US2570465 A US 2570465A US 10797049 A US10797049 A US 10797049A US 2570465 A US2570465 A US 2570465A
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screw
head
fixation
shank
bone
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Joseph S Lundholm
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Joseph S Lundholm
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/74Devices for the head or neck or trochanter of the femur
    • A61B17/742Devices 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
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/88Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/8875Screwdrivers, spanners or wrenches
    • A61B17/8886Screwdrivers, spanners or wrenches holding the screw head
    • A61B17/8891Screwdrivers, spanners or wrenches holding the screw head at its periphery
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S606/00Surgery
    • Y10S606/916Tool for installing or removing orthopedic fastener

Description

Oct. 9,1951 J, 5, LUNDHOLM 2,570,465

MEANS FOR FIXATION OF HIP FRACTURES Filed Aug. 1, 1949 Patented Oct. 9, 1951 UNITED STATES PATENT OFFICE 2,570,465 MEANS FOR FIXATION OF'HIP FRACTURES Joseph S. Lundholm, Rockford, 111.

Application August 1, 1949, Serial No. 107,970 3 Claims. (01. 12s 92) This invention relates to the fixation of hip fractures and specifically to a special surgical lag screw for this purpose. This is a continu ation in part of my co-pending application, Serial No. 703,253 filed, October 14, 1946, now abandoned, the present application differing from the parent application in the nature of the threads and in the provision of a shoulder or collar between the head and the shank of the Screw.

The human femur or thigh bone comprises a straight shaft extending upward from the knee and having an inwardly extending transverse neck portion at the top disposed at an average angle of approximately 130 with respect to the shaft. The neck terminates in a ball-shaped head which sockets in the pelvic bone. The neck of the femur and the portions immediately adj acent to it on both sides are stressed in shear by the weight of the body. Consequently, fracture of the femoral neck or of the head or shaft immediately adjacent the neck is one of the most common and at the same time most serious accidents occurring especially to elderly persons. Due to the inturned disposition of the femoral neck it is difiicult to get at the fracture and fixation is usually accomplished by driving one or more nails through the shaft of the femur into the neck and head thereof. Until as late as 1925 when Smith-Petersen presented his special three-flanged nail which is still popularly used for internal fixation of the fracture, it was general practice to reduce the fracture by manually pressing the broken parts together and then immobilizing the joint in a plaster cast for a long period, in many cases months. Since these accidents usually happen to the elderly whose conditions are only too often complicated with cardio vascular disease, renal disease, hyper tension, arthritis, diabetes, or senility, the greater majority of these fractures finally terminated in death due to the required immobilization which induced circulatory stasis resulting in hypostatic pneumonia or some other condition.

The Smith-Petersen nail above mentioned is now widely employed for the fixation of these fractures, that is, for holding the fragments fixed with respect to one another while they are growing together again. It has represented a long step forward in the treatment of such fractures and has eliminated to a large degree the plaster casts formerly required; however, it has presented a certain number of disadvantages which up to this time have been considered unavoidable. Because of its very large size the large surface z area'exposed to the body fluids results in some cases in electro-chemical reactions destructive to body tissues and, furthermore, the relatively large area of cancellous bone disturbed by the nail has been believed responsible for the destruction of certain nutrient blood vessels'supa plying the proximal or broken-on head portion of the femur, thus delaying or preventing altogether ultimate complete knitting of the fracture surfaces. Furthermore, any nail must be pounded into place which, as'in the case of elderly patients or others having very brittle bone structures, presents the danger of further splitting of the bone as well as discomfort on the part. of the patient.

Accordingly, a primary object of the present invention is the provision of a surgical lag screw. which exposes a minimum of surface area to. electro-chemical action by the body fluids; which may be used without any danger of causing sec-' ondary fractures; which causes a minimum of injury to the nutrient blood vessels supplying the relatively small proximal fragment; and which fulfills all the following long recognized criteria of rigid fixation:

lizing means, which allows the patient to be. immediately ambulatory in bed as soon as he can tolerate it, and which permits the patient to be ambulatory on crutches, unaided, within two or three weeks.

I have discovered that in every case of a frac ture d femur the small or proximal fragment is never less than 1" in length; thus, it has been possible for me to standardize on a thread length at the end of my surgical lag screw of approxi mately 1" with the assurance that it may be satisfactorily employed in every case. 7 3 Another object of the invention is the provision of a surgical lag screw for the fixation of; hip fractures in which the screw has a head; with a frusto-coni'cal surface disposed at approxie mately to the axis ofthe screw so thatlwhen.

the latter is emplaced in alignment with the femoral neck (which is disposed 130 with respect to the shaft) a portion of the frusto-conical head surface will engage the outer surface of the shaft in substantially fiatwise abutment.

Other objects and advantages will become apparent from the following description in connection with the drawings in which- Figure 1 is a longitudinal side view of a surgical lag screw comprisingone modification of the present invention;

Fig. 2 is an end view of the head of the lag screw shown in Figure 1;

Fig. 3 is a fragmentary, partially sectioned View of the joint between the pelvic bone and the femur, showing a characteristic hip fracture inthe femoral neck, and showing also the initial bore which is made in preliminarily fitting the lag screw; M

Fig. 4 is a View similar to Fig. 3, showing the lagscrew .being tightened. into position wit in. the .drilled bore;

..Fig. 5. is another viewsimilar to Fig. 3, showing the screw after it has been tightened into position to .hold the fragments of the broken f m firmly together; .and

Fig. .6 shows. in enlarged e tion a. e nd embodiment of the invention.

. The human femur, or thigh bone, I includes a shaft. .2 extending upward from the knee (not shown). Disposed at. an average approximate angle .of. 130 with respect to the shaft is a neck portion 3 terminating in. a ballap h a 4 seated in socket .6. in the. pelvic .0 6 e femur has upper and lower prominences 3 and 9, known respectively as the upper trochanter and the lower trochanter. As in bone structure generally, the femur I has a strong, hard outer covering [I called the cortex surrounding a core of cancellous or spongy structure l2 sometimes called marrow.

The majorityQf. ip fractures occur along the line A in the femoral neck 3, as shown, or close to the, neck on one, side r t e other as indicated by the broken lines C or B. This is because the neck itself is reduced in cross-section and is disposed transverse to the shaft '2' whereby the-entire weight of the body is effective to place a high shear loading on the neck and'on the intracapital and intertrochanteri'c areasimmediately adjacent. Thus, these parts are the first to fail when the pelvic-femur joint is overloaded asby a sudden, unexpected fall.

As a result of studyin hundreds. of these femoral fractures, I have discovered that the proximal fragment which is the smallest and includes the head 4 is never less than one inch long. even in cases of intra-capital fractures, that is, within the head itself, as for example, along the line 13. With this discovery, 1 have been able to develop the present invention in which the lag screw I3 may be formed in a few standard lengths each having a thread length of approximately one inch which may be wholly contained within the proximal fragment in carrying out the fixation operation. Thus, the number of screws which a hospital is required to stock to allow for the variation in patient sizes is minimized.

To avoid the disadvantages, above-mentioned, incident to the use of a large foreign body inthe bone, the lag screw I3 is made as small as possible consistent with the requisite strength. I preferto form the shank I4 and the base of the threads l6 abou in diameterwith. the diameter of the threads t6 about twice that and the 4 head I! somewhat larger, approximately 1 1;". The threads are preferably large, thin, coarse threads as shown in the drawings for readily gripping the cancellous bone structure [2, and in the preferred embodiment the sides of the threads facin the head I! are disposed in substantially right angle relationship to the shank M as indicated at 20 while the opposite sides of the threads stop toward the shank at a substantial angle to provide adequate stockand strength in the threads; I have had good results with screws having eight threads to the inch. The screw I3 is generally inserted in axial alignment with the neck-which liesat approximately with rebone against a high point on the underside of the scre ther by avoiding n ro of he-bone at that point and promoting rapid healing. The.-

screw headis furthermore formed with a counter: sunkrecess or socketJB oi the Allen (shown) or Phillips type (not shown) or the like; that. further avoids irregularities the screw head which would injure the tissues or bone structure; as the screw is tightened into itsfinal position. Adjacent the surface; I8, and surroundingqthe shank is a collar 24 which serves a dual purpose.

First, it serves to more effectively close the open ing in the bone around the shank left :by the entry of the threads as will be apparent f-romFig. 5. Secondly, it serves as a locating and guiding means where a bone plate is employed, It is essential that the lag screw be formed of .a material electro-passive in the body fluids which are highly corrosive to most metals; otherwise the electrochemical reaction incident to the corrosion-9fthe material will be destructiveto adjacent tissue,

and may in extreme cases prevent healing altogether... Two metals which possess both the required strength and electropassivity are Vitallium, an alloy.of cobalt, chromium and mQly-b denum, and 18-8,SMQ.stainless steel, an alloy of-roughly 18 percent nickel, 8 percent chromium, 2. to 3 percent molybdenum and the remainder iron, manganese and carbon.

In Fi g. 6 I have shown a modificationof the. invention which is substantially similar to that shown in. Figs. 1-5 and described in connection therewith with the exception that the screw has an axialbore 25 which extends from the bottom of the socket l9 through the opposite end of the.

screw. This bore preferably; has, a diameter of approximately 3 2- and has uninterrupted annular wall concentric with the outer wall of the-- shank H3 and of such size that the screwmay be;

received on a guide-pin. 2.6,, the head I 1, the shank H and the threads ifibeing identical with that shown in the previous figures. When this; screw is employeda handle designated generally by thenumeral 2- is employed for driving the screw, the handle'having a bore-as shown at 28 fer'thepas-- sage of the pin. I

- The lag screw will not ordinarily be used as a structural memberitself to: support the weight. of the body;:.rather, its primary purpose is. to.

hold the bone fragments firmly. together withsthegreatest possible fracture area 7 in contact. while.

the-broken parts areknitting together.; It per mits the patient to be immediately ambulatory in bed and walking on crutches within two weeks or so and thereby avoids the extended plaster cast immobilization and complications arising therefrom which has previously been employed. At the same time it avoids the disadvantages attendant to the use of nails for fixation.

In applying the lag screw I3 to the fixation of a femoral neckfracture, as for example along the line A of the drawing, the procedure is as follows: The patient is brought to the operating room following the usual 'pre-operative medication and is placed on the ordinary operating table. I use a cassette holder to replace a part'of the mattress pad to facilitate the taking of X ray films during the progress'ofthe operation, no

other, special equipment being needed. The pa-- I the upper thigh and traction is applied by an assistant holding this towel while manual traction is also applied in the axis of the flexed thigh. With traction being applied in these two directions the thigh i internally rotated and the leg is slowly circumducted into abduction and straightened out, the internal rotation being maintained. As the leg is brought down to table level the foot is over the edge of the table, and the heel-palm test is applied to confirm reduction. If reduction has been accomplished the leg will not evert itself. An assistant then holds the leg in this position throughout the operation, and X-ray pictures are taken in both the anteroposterior and lateral planes to ascertain that the fracture has been reduced.

A short incision is made through the lateral surface of the thigh extending downward from a point just distal to the greater trochanter 8. The incision is carried through the muscle beneath and it is separated down to the femur I.

The anatomical structure and angulation of the neck of the femur must be considered in selecting the point at which to drill through the cortex II of the shaft 2. The femoral neck averages one inch in diameter and, as mentioned above, is disposed at an angle of 130 to the shaft; in addition it has an antetorsion angle of 15. With this in mind, a drill (not shown) which serves as a guide pin and has a diameter somewhat less than the shank I I of the lag screw, is drilled through the cortex at the point selected and is drilled in to produce a bore 2| (Fig. 3) having a depth estimated from measurement of the size of the femur on the X-ray pictures. X-ray pictures are again taken to ascertain if the pin is correctly placed. If so, the guide pin is then removed, the calibration noted, and the length of required lag screw is determined.

The hard cortex at the opening of bore 2| is reamed out the size of the lag screw shank I4. A tap (not shown) the size of the threads I6, is then used through the cortex to permit the wide threads of the screw to pass through it without having to drill a larger hole. The lag screw I3 is mounted on the end of an Allen head screw-driver 22 and held in place by a hinged ,retaining=z.-frame 23 -.(Fig.- 51) the 'screwJ is then inserted in bore 21,. screwed through the distal fragment and. intogthe proximal fragment until the threads I B are wholly contained in the latter. The screw-can be felt to grip into the bone of the proximal fragment as the two fragments are drawn tightly together to the final position shown in Fig. 5. As the screw head I! is pulled down on the outer surface of the shaft 2, it turns smoothly without injuring the bone by reason of its smooth frusto-conical undersurface I8. These conditions are adverse, or where the surgeon may for some reason feel the need for positive guidanceof the screw, the pin maybe allowed to remain in place. A commutated tap may be employed which is passed over the pin to ream out the cortex as explained above and thereafter a screw such as shown in the modification of Fig. 6 employed, the pin being removed after the screw is seated.

The entire procedure seldom requires more than thirty to forty-five minutes, and the patient suffers little or no shock. The patient is returned to bed and the leg placed on pillows with the knee slightly flexed and the thigh moderatel abducted. Routine care is given and a high backrest permitted as soon as tolerated. The patient is completely ambulatory in bed, and in five or six days is permitted up in a chair. Walking with the aid of crutches is permitted as soon as the patient is strong enough to use them, but he is advised not to put any weight on theaffected leg for two months. I have had several cases, however, where this advice was disregarded, and walking unaided attempted within a few weeks with no ill effects.

I have found this lag screw equally effective in intertrochanteric fractures as well as the intracapsular types. The tension exerted by the pull of the wide threads against the screwhead placed against the cortex II holds the fragments firmly immobilized, which is the fundamental requirement of all fracture treatment. I have found that no additional means need be provided to prevent the fragments from rotating (such, for example, as the three longitudinal flanges on the Smith-Petersen nail) for since all fractures are ragged to a greater or lesser extent, the pressure of the lag screw forcing them together acts to prevent rotation.

While a particular lag screw and a particular method of applying it has been shown in connection with the present invention, it will be apparent that minor changes therein will readily suggest themselves to others skilled in the art without departing from the spirit and scope of the invention.

I claim:

1. A one-piece surgical lag screw for the fixation of a hip fracture wherein the proximal and distal fragments include respectively the head and shaft of the femur comprising a single piece of metal electropassive in the body fluids including a shank having a smooth cylindrical outer surface, a threaded portion approximately one inch in length at one end of said shank, the thread being continuous from end to end, the base of the thread having a diameter not greater than the diameter of the shank, the outer diameter of the thread approximating twice the diameter of the base and tapering to a lesser diameter at the extreme end of said screw, and a head at the opposite end of said shank having a frusto-conical surface adjacent the shank for rotation against the cortex of the femur shaft in the final tightening operation and a socketfor reception of a tool for rotating the. screw the perimeter of the socket. being spaced inwardly from the perimeter of the head.

2. The combination recited in claim 1 wherein a cylindrical collar having a: uniform diameter slightly greater than that of the shank and ma terially less than that of the head is disposed between the shank and said frusto-conical surface.

3. A unitary surgical lag screw comprising a head having a smooth frusto-conical circularly extending uninterrupted under-surface and a socket recess for receiving a tool, a shank havinga smooth uninterrupted circular outer surface integral with the head having a diameter of approximately 5%" and a threaded portion integral with the end of said shank having a length of approximately one inch, an outer diameter of approximately adjacent the head and taperin to a lesser diameter at the extreme end of the screw away from the head and an inner diameter not greater than the diameter of the shank whereby said screw will expose a minimum surface area for: electrochemical action by the body fluids, the thread on said threaded portion being continuous from end to end and. having a sidefacing the head disposed at approximately right angles with respect to the, longitudinal axis of the screw.

JOSEPH S. LUN'DHOLM.

REFERENCES CITED The following references are of record in the file of this; patent:

UNITED STATES PATENTS OTHER REFERENCES La Presse Medical for May 28, 1921, page 42 1. (Copy in Div. 55.)

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