The acute inflammations which are occasionally observed in one or several articulations of newly-born infants are generally pyæmic. It is only in the early stage of acute glanders that the severe muscular and articular pains sometimes present in that very rare disease in man might lead to its being confounded with acute articular rheumatism; but the patient's occupation and history, the early and severe prostration, the absence, as a rule, of redness and swelling around the painful articulations, and, in some instances, the early appearance of pustules and blebs on the skin and of abscesses in the deeper tissues, will suggest the real nature of the case.
Acute periostitis frequently occurs in children in close proximity either to one joint, or less frequently to more than one, and may readily be confounded with acute articular rheumatism. But the constitutional disturbance in acute periostitis is prompt and severe at the outset; the swelling increases rapidly, is firmer than that of arthritis, does not involve the joint proper and its capsule, but, like the tenderness on pressure, exists above or below the articulations, especially around the head of the bone; there are no visceral complications, provided pyæmia has not supervened; the constitutional symptoms early assume a typhoid character, and unless an early incision be made a fatal issue soon ensues.
The enlarged ends of the long bones and the pains in the limbs of rickets might lead to a suspicion of acute articular rheumatism, but the early age of such children, the absence of pain and swelling in the joints, the beaded condition of the sternal ends of the ribs, the late dentition and locomotion, the peculiarly shaped head, and other evidences of that affection, would prevent a careful observer from making a mistake. Inherited syphilis in infants, like rickets, may produce fusiform swelling and thickening at the ends of the long bones, especially the humerus and femur, and sometimes pain in the joints on movement; but at first the swelling is confined to the epiphyseal line, and only later extends to the joint; there is a pseudo-paralysis of the limb, and but little pain or fever; bony osteophytes may often be felt under the skin at the line of union of the epiphysis with the shaft; the epiphysis often becomes separated from the shaft, and suppuration may ensue around the bone and in the articulation; sometimes adhesions and perforation of the integument take place, allowing of the escape of disintegrating osseous and cartilaginous tissue; and there will coexist either on the skin or mucous membrane some of the ordinary evidences of inherited syphilis.120 The acute and subacute articular inflammations occasionally observed in cerebral softening and hemorrhage, in injuries and inflammation of the spinal cord and caries of the vertebræ, may be distinguished from acute and subacute articular rheumatism by the following circumstances: the existence of some one of these diseases of the brain or cord, the articular affection being usually confined to the paralyzed limbs; its invasion about the time of the setting in of the late rigidity, or even still later; the absence of cardiac complications and the presence of other trophic or neuro-paralytic lesions, such as acute sloughings, rapid atrophy of the palsied muscles, cystitis, ammoniacal urine, etc.121
120 Vide Parrot, Archives de Physiol. Norm. et Path., 1872 and 1876; R. W. Taylor, Bone Syphilis in Children, New York, 1875.
121 See J. K. Mitchell, Am. Jour. Med. Science, vol. viii., 1831, and ib., 1833; Scott Alison, Lancet, i., 1846, 276; Brown-Séquard, Lancet, i., 1861; Gull, Guy's Hosp. Repts., 1858; Charcot, Archives de Physiologie, t. i. p. 396, 1868, and many others.
Acute articular rheumatism in children presents peculiarities. It often affects but one joint, and has little tendency to become general; the joints of the lower extremity, ankle, and knee are most obnoxious; the local signs of inflammation, redness, swelling, and pain, are feebly developed, and the child may walk as if nothing were wrong; the disease is usually subacute; the temperature rarely very high; the perspiration not profuse; the urine not scanty, and not often loaded with lithic acid. Cardiac and the other internal complications, except the cerebral, are more frequent than in adults; endocarditis is especially frequent, pericarditis and pleuritis not rare. It is almost exclusively in childhood that acute articular rheumatism becomes associated with or followed by chorea, and yet the delirium, coma, and convulsions frequently observed during rheumatic fever in the adult are very rarely seen in the child. Muscular rheumatism, however, in the form of torticollis, frequently coexists, and so do erythema nodosum and the subcutaneous fibrous nodules previously described.
Mono- or Uni-Articular Acute and Subacute Rheumatism.
It is very rarely indeed that acute rheumatism invades a single joint to the exclusion of the rest; and it is perhaps impossible to be certain that such an arthritis is rheumatic unless some of the other symptoms or complications of articular rheumatism supervene, or unless it have succeeded a polyarticular rheumatism, which it very rarely does. Mono-articular rheumatism is very generally of the subacute type, and unattended with fever from the outset, or only a moderate pyrexia obtains for a few days; there is generally considerable effusion into the joint, with swelling, pain, and moderate local heat; visceral complications very rarely arise, but the local inflammation persists most obstinately for six or eight weeks or three or four months, and often leaves the joint tender, stiffs, and weak for a long time or even permanently. In both the acute and subacute forms, before concluding that the uni-arthritis is rheumatic, we must exclude the probability of its being traumatic, strumous, syphilitic, gonorrhoeal, neurotic, or, above all, of the nature of rheumatoid arthritis, which many such cases really are.
PROGNOSIS.—The disease is rarely directly fatal during the attack, yet as the frequency of the complications varies unaccountably from time to time, so the mortality may be exceptionally large or small for even prolonged periods. It may be said that the average mortality ranges between 1.16 and 4 per cent. in the experience of modern authors. The average mortality in the Paris hospitals for four years (1868-69, 1872-73) Besnier fixes at 1.65 per cent.;122 in St. Bartholomew's, London, Southey found it for fifteen years (1861-75) to be 1.16 per cent.;123 Pye-Smith fixes the rate at 4 per cent. in 400 cases treated in Guy's;124 W. Carter gives 2.5 per cent. as the rate during ten years at the Southern and Royal Southern Hospitals of Liverpool.125 The death-rate appears to vary remarkably with age, as Southey's figures show:126 under ten years, 3.40 per cent.; between ten and fifteen, 1.5 per cent.; between fifteen and twenty-five, 1.4 per cent.; between twenty-five and thirty-five, 0.9 per cent.; between thirty-five and forty-five, 0.8 per cent., the mortality declining very greatly after the tenth, after the twenty-fifth, and after the forty-fifth year of life.
122 Dictionnaire Encyclopédique, Troisième serie, t. iv., p. 463.