In the lower extremity, as in the upper, the bursæ become enlarged, in consequence either of pressure or of external injury. The affection may be acute, following a blow or squeeze, but is most frequently chronic, enlarging gradually and with little or no pain, and caused by habitual pressure on the part. From this, it will at once be understood, why the bursa over the patella should be the one most commonly affected. Its vulgar name, housemaid’s-knee, marks its cause—the avocations of such persons requiring them to rest on
one or both knees, frequently, and often for a long time. It also occurs in shop-keepers, and other persons accustomed to shut drawers with their knee, or in other ways to make frequent pressure on that part,—in gardeners, and those employed in similar pursuits. In the acute swelling from injury, local depletion, fomentation, and rest are required, and these are generally sufficient to arrest the swelling, and promote its subsidence; but, in some cases, the fluid is deteriorated and the surface inflames, free incision is required, followed by poultice, and afterwards by simple dressing. In the chronic collection of clear fluid, gentle and continued stimulation of the surface, as by the gum and mercurial plaster, causes gradual decrease by absorption; the causes of the affection being at the same time studiously avoided. The tumour sometimes, as here shown, attains a large size, and from repeated inflammatory attacks becomes consolidated. The cyst is thickened, and lymph is effused into the cavity so as to convert an encysted swelling into one of solid consistence. In such cases as these, the tumour may cause such inconvenience as to make the patient desirous to have it dissected out. This is easily and safely effected; the incisions are made in the direction of the limb, and it is kept at rest in the extended portion for some time, so as to favour the healing of the wound.
Unyielding parts, habituated to pressure, defend themselves by the interposition of a moveable bag containing fluid; betwixt them and the surface the cellular tissue condenses into a cyst, its internal surface assuming a serous appearance, and secreting a fluid resembling the synovial. Such adventitious bursæ are not unfrequent on the ankles and feet, as in tailors, or others usually sitting cross-legged. They may attain a considerable size, and so produce deformity; but they should not be interfered with unless they become inconvenient, as from excited action.
When the extremity of the metatarsal bone of the great toe is large, and consequently the seat of pressure, a bursal formation is produced in the soft parts covering it; this from increase of pressure, or other irritation, may inflame—forming the painful and troublesome disease termed Bunnion. Sometimes unhealthy abscess occurs, with thickening, infiltration, and condensation of the surrounding cellular tissue; in such cases, incision and poultice are required, and occasionally it is necessary to destroy the unsound cellular tissue and the degenerated cyst by free application of the caustic potass. The cyst is thus got rid of, healthy granulation takes place, and by afterwards avoiding undue pressure upon the part, a permanent cure is obtained.
It has been elsewhere mentioned, that cartilaginous bodies sometimes form within articulating cavities, occasionally attached by a narrow and slender connection with the secreting surface, but generally loose, seldom numerous, and usually of no great size. They are most commonly met with in the knee-joint, producing inconvenience by impeding progression. Sometimes they are neither painful nor annoying, being small, and seldom becoming interposed between the articulating extremities of the bones during motion; such ought not to be interfered with. But when large, they may be so troublesome as to warrant incision and removal. The foreign body is made to project on one side, and, having been made as superficial as possible at a favourable point, is fixed by the fingers of an assistant. The integuments are then drawn to one side, and an incision made over the body, the capsule is cut to as limited an extent as possible, and removal effected by pressure—or it may be laid hold of by a hook, and extracted; if the cartilaginous substance be attached by a pedicle, this must be divided, but with great caution. The integuments are immediately allowed to resume their natural situation, and so to close the wound of the capsule by overlapping it; the skin is then accurately approximated by adhesive plasters. The limb is kept extended, and not the slightest motion of the joint permitted. The patient is confined constantly to the recumbent posture, purged, and kept on low diet; the utmost vigilance is necessary to prevent inflammation of the synovial apparatus. In some patients on whom I have performed this operation, the wound closed by the first intention, and no untoward symptom threatened, motion and the erect position being resumed in a few weeks. But in the last case which came under my care, though the extirpation was performed with the utmost care, most violent inflammation supervened; the wound opened, synovial secretion flowed out in large quantity, profuse escape of unhealthy matter followed, and exhausting discharge continued for many weeks. At one time the constitutional disturbance was so great as to endanger life; the limb was saved with difficulty, the joint anchylosed. From the result of this case, I am disposed to dissuade operative interference, unless the patient strenuously urge it, and be willing to take the responsibility for the consequences on himself.
[The most common distortion to which the human body is liable is Club-foot; an affection which has at all times attracted the notice of the profession, but which has received unusual attention within the last ten years on account of the novel operation suggested for its cure by Dr. Stromeyer of Hanover, in Europe. The lesion is, for the most part, congenital. It may, however, be developed after birth, and even at an advanced period of life, from the foot being accidentally placed in a constrained position, and so retained until the soft structures—particularly the muscles and ligaments—are moulded into a new shape, or until they become fixed in their new situation. Various mechanical causes may give rise to this malady, such as splints and bandages, by which the parts to which they are applied are injuriously compressed, or thrown out of their natural relations. Similar results are produced by convulsions, dentition, nervous irritation, contusions, sprains, fractures, partial luxations, and preternatural laxity of the ligaments. In some instances the defect is occasioned by the presence of a corn, an ulcer, or some other disease which induces the person to walk on one side of the foot, the tip, or the heel, to ward off pressure from the tender parts. A vicious habit is thus established, which, if it be kept up, as it often is, for any length of time, leads to irregular action in the muscles, and to distortion of the bones into which they are inserted.
The formation of congenital club-foot has never been satisfactorily explained. By some—as Meckel, St. Hilaire, Serres, and Breschet—it has been ascribed to an arrest of development. This theory, however, for various reasons, is untenable, and has therefore not been generally adopted by surgical men. Mons. Martin, a recent French writer, thinks it is mainly occasioned by the pressure of the parietes of the uterus on the feet of the infant during gestation, owing to a deficiency of the amniotic fluid; an opinion in which he is joined by Professor Cruveilhier. That the disease may proceed from this source in some instances maybe readily supposed, but that this is the only cause, is what few will believe. The most plausible hypothesis, in my opinion, is that of Mons. Guerin of Paris. He supposes that the primary mischief is in the nervous system, and that the spasmodic and permanent shortening of the muscles of the affected limb is altogether consecutive. He sums up the results of his numerous observations in the following propositions:—1. Congenital club-foot is the effect of a convulsive contraction of the muscles of the leg and foot. 2. In the absence of general or direct traces of the convulsive affection we may almost always discover some immediate characters which indicate the nature of the exciting cause. 3. There are three constituent elements in the retraction of the muscles of the part: namely, the immediate shortening of their substance and tendons; a certain degree of paralysis; and, lastly, a consecutive arrest in the development of their substance. 4. There are no other causes of genuine congenital club-foot than convulsive muscular retraction. The pressure of the parietes of the uterus on the fœtus appears, indeed, in some cases, to produce a deformity of the limbs and feet, similar to but not identical with club-foot. The views of Mons. Guerin are confirmed, in some degree, by the history of those cases which occur after birth; but future observation must determine whether they are correct or otherwise.
The congenital variety of this distortion often affects both feet simultaneously, though rarely to the same extent. In one hundred and sixty-seven cases reported by Dr. Detmold of New-York, the disease was double in nine-three; in forty-one it occurred in the right foot only, and in thirty-three only in the left. Of eighty cases collected from various sources by Mons. Bouvier of Paris, or observed by himself, two-fifths were double; one-third affected the left limb, and one-fourth the right. Of sixty-one cases furnished by Martin, another French writer, twenty-six were double and thirty-five simple: of the latter, eighteen were of the right and seventeen of the left foot. Mons. Helt has published the results of thirty-one cases, in nineteen of which the disease was double; in two it was more distinctly marked on one leg than on the other; and in one instance the calcaneal form of the lesion was united with the inverted. In twenty-one cases observed by Scoutetten, both feet were deformed in nine; and in the other twelve the right limb was exclusively involved seven times; the left five times.
The disease would appear to be more frequent in males than in females, though the relative proportion has not been ascertained. The following table, embracing three hundred and twenty-nine cases, will throw some light on this subject:—