Part 77

The ligament of the patella does not often give way from muscular action; it is much stronger than the bone, and the latter consequently snaps. It may be, and has been, divided, along with the superimposed integument, by a fall on a sharp substance. This accident is followed by lameness, the ligamentous tissue does not soon unite, and the limb is long in regaining its usefulness; sometimes the union is imperfect, and the member remains weak.

Division of the integuments over a fractured patella is a very serious accident. The joint is opened, and such a state both of the limb and of the constitution must in general sooner or later occur as to cause necessity for amputation. Cases have, however, occurred, in which compound fracture of the patella has been cured.

The bone unites, under favourable circumstances, in the same way as any other. In longitudinal fracture there is almost always bony union. In transverse, the obstacles to correct apposition are great; the upper portion is acted on by the muscles on the fore part of the thigh, to a greater or less degree, in almost any position; there is increase and vitiation of the synovial secretion, and when the bones are approximated, this fluid is interposed. The union is therefore almost uniformly ligamentous, and, fortunately, this is as strong and as rapidly effected as that by bone. When the treatment is not of the most approved kind, a long portion of ligament is produced, and the limb remains weak. But union by a short ligament is undoubtedly the most desirable result, the member is as useful as when bone is the uniting medium, and ligament is less subject to disruption; bony union is, for a long time, apt to give way on the application of even slight force.

The fragments are to be approximated, and brought nearly into contact, by placing the limb, with the knee extended, and the thigh slightly bent on the pelvis. The limb is retained in this position by the application of a straight splint behind, hollowed at the extremities, extending from a little below the tuberosity of the ischium to below the middle of the leg, and retained by a roller, not at all tight; the foot and lower part of the limb must be previously bandaged to prevent infiltration. All apparatus with straps, buckles, and apertures to receive the portions of the bone, are worse than useless. The splint requires to be worn for some time after the patient gets into the erect position, which ought not to be before six weeks after the accident.

_Fracture_ may occur at any part of the _leg_. One or both bones may give way, either transversely or obliquely, according to the application of the force. The transverse fracture is produced by a direct blow, by a heavy body striking or falling on the limb, or by the lower part of the limb being fixed whilst the body is in rapid motion; the oblique is caused by force applied in the direction of the bones—as when a person falls or leaps from a height, and alights on one foot, the limb being extended and the body erect. In the latter description of accident, it is frequently supposed, erroneously, that but one bone has given way; fracture of the tibia perhaps is perceived some few inches from the distal end, whilst the fibula at that part is entire; but, by attentive manipulation, it will often be found that the fibula has sustained fracture, within a short space of its upper extremity; the force was applied to the ends of the bones, and they gave way, each at the weakest part.

The tibia is broken at its upper part near the tuberosity, with or without similar injury of the fibula. There is considerable displacement, particularly in the bent position of the knee; there is no restraint to the action of the extensor muscles inserted immediately above the point of fracture, and these, though not acting with unusual power, cause protrusion of the upper end of the tibia, the condyles of the femur serving as a fulcrum over which the muscles are stretched. This injury is usually the result of direct violence.

Fracture of one bone, at a point lower in the limb, is not attended with much displacement or deformity. Indeed, attentive manipulation is often required to detect the site of the injury; and a sense of crepitation is perceived, only when the lower and upper portions of the bone are pressed on alternately or during rotation of the foot. When both bones are broken, the displacement and swelling are great. The foot is sometimes turned inwards, but usually it falls outwards; and if there has been much laceration of the soft parts, with or without division of the integuments, the lower portion of the limb hangs quite loose.

By the application of great force, as by a rope being twisted round and run tight on the limb, both bones and soft parts may be reduced almost to a pulp, without much or any division of the integument. Such an accident is followed by rapid and great swelling, violent incited action, gangrene, and severe constitutional disturbance. The progress of the mortification is not in all cases uniform; in some, the swelling and discoloration extend to the groin and trunk in two or three days, attended with furious delirium; in others, the disorganisation of the limb is very slow, some days elapsing before it reaches the knee, and in these the constitutional symptoms are less severe.

In some cases there is extensive wound of the integuments, without serious injury of the bone, muscles, or vessels. The skin either has been divided by the external force acting upon the resisting bone, or the sharp fractured end of the bone has been thrust through. Sometimes the bone is protruded to a considerable extent, and entangled amongst the more superficial soft parts.

Fractures of the lower portions of the bones are generally the consequence of twisting and partial displacement of the ankle. The fibula is most frequently broken by twisting of the foot outwards, and the fracture is almost uniformly between two and three inches above the articulation. The broken ends are displaced inwards upon the tibia. The injury is detected by moving the foot, and tracing the line of bone; after swelling has taken place, examination, though almost equally easy, is productive of much more pain, and it is of importance to ascertain the nature of the injury at once, and immediately after the accident. The outer malleolus sometimes gives way from the same cause; or it may be snapped off by a direct blow. The lower portion of the tibia is sometimes longitudinally split by bending inwards of the foot, the patient having fallen from a considerable height; occasionally the inner malleolus is broken transversely. Inquiry as to how the accident happened, particularly as to the direction of the twist, the displacement of the foot, and the degree and extent of crepitation, will determine the nature of the injury.

The astragalus, os calcis, the other bones of the tarsus, and those of the metatarsus, are sometimes broken by the application of great force, but they are not much displaced. Sometimes the foot is violently concussed in consequence of a fall from a height, and though no fracture may have occurred, the patient is equally lame and pained; severe inflammation is sure to supervene rapidly, and may terminate untowardly.

Fracture of the upper part of the tibia is to be treated in the straight position, for it has been already observed, that when the knee is bent the upper portion necessarily projects. A hollowed splint of wood, extending from the middle of the thigh to near the heel, is applied behind, whilst one of pasteboard may be placed on each side: all are secured by bandaging, the foot and lower part of the limb being rolled previously to prevent infiltration; by this simple apparatus, motion of the knee-joint, and of the ends of the bones on each other, is completely prevented; the heel is raised, if necessary, for complete adaptation.

Fractures of the middle and lower portions of the bones are treated most advantageously, whether simple or compound, in the bent position, the angle being made more or less obtuse, according to the degree of flexion most conducive to easy reduction and retention. Extension is made on the limb, and the parts brought into as natural and handsome a shape as possible; in doing so, the appearance of the sound member should be kept in view. There is seldom any difficulty in accomplishing reduction; the extending and counter-extending power need be but slight; the upper part of the limb is steadied by an assistant, whilst the lower is stretched and moulded by the hands of the surgeon. In compound fractures at this part, the portions of bone completely detached from the hard and soft parts are to be extracted. And if reduction cannot be effected in consequence of a sharp and long end of the bone projecting through a narrow wound, either the portion must be abridged by the saw or cutting pliers, or the wound must be enlarged. Sometimes the one mode is preferable—sometimes the other—occasionally both are required. When the protruding portion composes but a small portion of the shaft, though perhaps of considerable length, it should be taken away; when, on the contrary, it is more thick than long, it is better to enlarge the wound; but on this subject no general rules can be laid down. The splint is the same as that recommended when treating of fractured thigh, composed of a thigh and leg-piece, with a moveable foot-board—the double inclined plane, improved by the late Mr. M’Intyre of Newcastle and others. A very simple and efficient apparatus has been used in our hospital for some years back. It answers every purpose fully better than the others, and can be had of all the instrument makers for a third of the expense of those previously in use. The foot-board is fixed so as to make the leg-piece of the proper length, and the splint is secured at a convenient angle. It is padded by means of a cushion filled with oat chaff. The foot is rolled separately; the limb is then raised carefully, and laid down on the splint placed quickly beneath by an assistant; it is retained in a proper position by the hands of the assistant, whilst a roller is carried from the toes round the foot-board, and along the limb to the knee. A broad roller is then made to surround the thigh and splint, and having been turned several times round the loins, is secured to the upper part of the cushion. The limb is thus rendered independent of the motions of the trunk; it is made as of a piece with the splint. It should be raised considerably above the level of the trunk, whilst the patient is in bed, in order, by favouring the return of blood, to prevent swelling and inflammatory action. The wound, if any, is to be approximated. If discharge follow, part of the bandage may be undone from day to day, for the purpose either of employing fomentation or of applying suitable dressing, and still the limb is kept perfectly steady. Abscesses must be opened early—spiculæ removed—constitutional symptoms warded off, and, if they do occur, combated,—at one time inflammatory action must be kept down—at another and more advanced stage, the strength must be supported by all means. In simple fracture it is seldom necessary to undo the bandage, till the apparatus is loosened by subsidence of the swelling—and if the fracture be early reduced, and kept steady, that will be but slight. Then the bandages are undone and reapplied, and the position of the limb attended to. It is seldom necessary to interfere with the leg during readjustment, but should there be any deviation, even considerable, from the proper position, it is easily remedied at the end of the first, second, third, or even of the fourth week; but the sooner the better. The patient may be removed from bed, and may sit up during the greater part of the day, with the heel on a level with the pelvis, within the first week. His health, appetite, and spirits, are thus kept up, sore back is avoided, the tedium of confinement diminished, and the cure greatly accelerated. At the end of five, six, seven, or eight weeks, according to the age, and as the consolidation advances, the patient may be allowed to move about on crutches, some few days after removal of the apparatus, the foot and leg being still bandaged, and supported by light splints, or the bandages may be starched and applied moist, with portions of coarse brown paper interposed. A firm case is thus formed for the protection of the limb and retention of the bones. No weight should be put on the limb for several weeks after, otherwise a leg cured well and straightly may become bent, twisted, and deformed.

Fractures of the lower extremities of the bones, and of the malleoli, are reduced by placing the foot straight, and retaining it so by the application of a wooden splint; the parts are protected by a wedge-shaped pad, and the whole is retained by a common roller. The splint is made to project two inches or two inches and a half beyond the ankle, and to reach near to the knee-joint. It has two perforations in the upper end; to these a bandage is attached by its split end, and it is then carried down along the inside of the splint, and rolled round the foot and ankle; thus the apparatus is prevented from shifting upwards. The other extremity of the bandage, during its convolutions round the foot, is made to pass through notches in the farther end of the splint; the foot is thus turned to the side opposite to that in which it was placed by the accident, and ought to be retained so till consolidation has taken place. The splint is of course always placed on the side of the limb opposite to the fracture.

_Disunited Fracture._—In some cases union takes place very slowly. On removing the splints, with the expectation of finding the bones firmly united, the ends can be moved very freely on each other without crepitation or much pain. This, as already stated, may be referrible to various causes,—necessary or accidental evacuations, natural or not—diversion of the nutritious fluids to some particular organ, as in pregnancy—the period of life—a diseased state of the bone of the periosteum or medullary web. By keeping the parts immoveable and firmly compressed for some time longer, consolidation may be brought about. But in spite of every care, the ends of the bones in some cases remain unconnected by any save a soft medium. This happens, however, very rarely under proper management. I have had but one case of it in my own practice, when the patient was from the first under my own inspection and care; and in that the occurrence of false joint was attributable solely to the absurd conduct of the patient. He was tripped up on the street by some individuals following their avocation as pickpockets, fell, and broke his forearm. The fracture was immediately reduced and splints applied—one of pasteboard on each side, with a wooden one exteriorly till the pasteboard hardened. He soon cut away the ends of the splints—within thirty-six hours after they had been put on—so as to allow motion of the fingers and hand, sufficient for indulgence in card-playing. The splints were still farther shortened, and wholly removed much too soon; shortly afterwards he fell from horseback. No union took place by bone. Unless in the case of previous disease of the bone, disunion is generally attributable to some carelessness or recklessness, either of the surgeon or of the patient.

If any osseous deposit has taken place, it is absorbed; the ends of the bone are diminished in size by interstitial absorption; ligamentous or fibro-cartilaginous tissue is formed round the wasted extremities; and the surrounding cellular tissue being thickened and condensed, a sort of synovial pouch is formed, in which the ends, by this time smooth and rounded off, move freely. The limb is shortened in some degree, and its actions are very much diminished in force, there being no sufficient support for the muscles. The bones of the leg and of the forearm are occasionally the seat of false joint, sometimes the femur, but most frequently the humerus.

By the tight application of a firm and broad belt of leather, the part is steadied, and the limb rendered more serviceable. Various measures have been proposed and practised with the view of promoting a salutary increase of action in the parts, by which osseous deposit in sufficient quantity to form a firm uniting medium might be procured. The ends of the bones have been exposed by incision, and removed either by the saw or by cutting pliers; they have then been placed together, retained by proper apparatus, and the case treated as one of compound fracture. The ends have been cut down upon, rubbed over with escharotics, as caustic potass, and afterwards treated as in the former method. Setons have been passed between the ends of the bones, and been retained till sufficient action has occurred; they have been then withdrawn, and the limb steadied by splints and bandaging.

To the last method I would, from some experience, give the preference. It is the least severe, both immediately and consecutively; it is the most readily accomplished, and the most likely to be followed by a successful result. The exact site of the ends of the bones must in the first place be ascertained; the position of the bloodvessels and nerves must be looked to, that they may be avoided; a bistoury is then passed through the skin and down into the substance interposed between the ends of the bones. A strong and sharp needle, fixed in a handle, and with its eye near the point, is passed, in the track of the knife, fairly betwixt the bones, and pushed through the soft parts on the opposite side of the limb. A cord is then passed through the eye, and by withdrawal of the needle the seton is properly lodged. The effects must be attentively watched, and when sufficient action is supposed to have been excited, perhaps at the end of the first week, the cord is withdrawn, and the limb placed immoveable in a proper position. If action is slow in supervening, the chord may be smeared with irritating substances, as the unguentum oxydi hydrargyri rubri, or the unguentum cantharidis, &c. In this manner I have treated false joint in several situations successfully, but I have also been sometimes foiled in effecting my purpose. The seton must not be long retained, the object being to excite action, not to perpetuate discharge, by the profusion of which the end will be effectually frustrated. Much will depend on the period at which the practice is adopted.[63]

_Dislocations._—Some joints are so contrived—their composing bones are so notched into one another, and connected by such powerful apparatus—and they are crossed by tendons, and tied together by ligaments in such a manner,—that dislodgement can scarcely be effected but by the most violent means. Nothing short of immense force is sufficient, and the displacement is uniformly attended with fracture of portions of the bones, or of their processes. Other bones are loosely joined, permitting free and unrestrained motion in all or in many directions, and but little force, applied in particular directions, suffices to separate and luxate them. In every joint the processes are liable to be broken, and the attachments of the ligaments to be torn off; ligamentous tissue withstands a greater degree of sudden violence than the osseous. The synovial membrane, and the fibrous tissue exterior to it, are almost always torn in complete luxation; but the extent of laceration varies in different joints, according to the direction of luxation and the degree of displacement. The rent may be small, closely embracing the neck of the bone; or there may be an extensive gap on the side opposite to that on which the luxation has taken place. In an articulation surrounded by muscular substance, there is also laceration of this to a greater or less extent. In some individuals, dislocation is very apt to occur, perhaps from peculiar laxity of fibre; and if in any person luxation of a joint has once been produced, the accident is apt to occur again and again from but slight causes.

In general, the mobility of the luxated joint is much diminished; the limb is either shortened or lengthened; its contour is changed; the injury is attended with violent pain; the patient is sick and pale; the system receives a shock, from which it gradually recovers after some time. Then swelling, from effused blood, takes place; and this is followed, after some hours, by excited action of the vessels and farther effusion, giving rise to greater stiffness and pain on attempts at motion. If no means are taken to replace the bone, and painful feelings subside along with the swelling, the limb remains long useless, and is the seat of occasional lancinating pains, but at last motion and utility are to a certain extent restored by the formation of a new joint—the head of the bone, and the parts on which it rests, mutually accommodating themselves to each other, by degrees, and permitting a limited extent of motion. _Post mortem_ examination, years after the occurrence of the injury, shows change in the form of the bones—the head is flattened, and in the bone on which it lies there is a corresponding depression, formed partly by the deposition of new matter, partly by absorption of the old; in dislocation on the dorsum of the ilium, for example, there is excavation by absorption opposite to the centre of the head of the femur, and round this new osseous matter is deposited so as to form the cavity into a cup resembling the acetabulum. New processes are formed for the attachment of the muscles, and the old are absorbed to a remarkable extent. There are also new ligaments; and a sort of capsule is formed by condensation of the surrounding cellular tissue. The new articulating surface becomes quite smooth internally, and is covered, if not by cartilage, by a smooth substance which answers the purpose tolerably well; the old is gradually filled up and obliterated, the prominences being absorbed, and the cavity occupied by new deposit. These changes do not take place so rapidly as is generally supposed; the cartilage and synovial surface are not much altered for months after the occurrence of luxation; and if replacement be effected, the functions of the parts are soon performed as before the injury.