Waldeyer and Köhner,111 after examining twelve cases, confirm in the main these investigations of Wegner, but interpret the changes as arising rather from the formation of a gummous tissue between the epiphysis and diaphysis than from an osteo-chondritis. The tissue-death which occurs later, the atrophy of the cells, etc., they compare with the same modifications observed in syphilomata.
111 "Beiträge zur Kenntwiss der hereditäre knochen Syphilis," Virchow's Archiv, B. 55, S. 367.
Parrot112 in a number of exceedingly valuable papers has repeated and greatly extended these observations. He places especial importance upon the formation of osteophytes, which, he says, in the first stage envelop the diaphyses of the long bones, especially at their inferior extremities. In the succeeding stage the new bony layers are more porous; a gelatinous degeneration affects the epiphysial cartilage and the spongy bones at a point where they are in contact; the epiphyses tend to separate from the diaphyses. This solution of continuity results in a characteristic pseudo-paralysis, with curvatures, abnormal twistings, and preternatural mobility of the bones, with loss of the power of locomotion. Then the osteophytes increase in size by the formation of several layers, thus enlarging the inferior extremities of the long bones. He describes the general process as consisting, first, of a periosteo-genesis—a formation of osseous tissue from the periosteum; next of a chondro-calcosis—a calcareous incrustation of cartilage; and finally of a gelatiniform degeneration and softening of the bone, with diaphyso-epiphysial disjunction.113
112 Société de Biologie, June 1, 1872; Société anatomique, 1873, p. 92; Archives de Physiologie, 1876, vol. iii. pp. 138, 139; Revue mensuelle de Médecine et de Chirurgie, 1877; Pathological Trans., 1871, vol. xxx. p. 339, etc., etc.
113 Cornil (op. cit.) coincides in the main with this description.
Taylor114 sums up the results of his observations as follows: "In the first stage we have a simple hyperplasia of cells with irregular deposition of lime salts; in the second, an intensification of this condition; and in the third, a new element—namely, the abnormal proliferation of all the elements of the tissues, with an infiltration of granulation-tissue into the medullary spaces following the vessels."115
114 Syphilitic Lesions of the Osseous System in Infants and Young Children, New York, 1875, p. 134.
115 Verraguth (Archiv für Path. Anat.) describes the first step as an excessive formation of vessels in the cartilage and a corresponding overgrowth of the cellular elements. This becomes inflammatory, and constitutes a primary syphilitic chondritis, the changes in the medulla of the bone being degenerative and secondary to the affection of the cartilage. Still other observers have described the process, each with minor modifications; but as they are of no clinical importance, it does not seem worth while to quote them.
We see, then, that, setting aside minor points of difference, these observers all coincide in describing this condition as one essentially of the nature of syphilitic bone troubles with which we are familiar in the acquired form of the disease, consisting primarily and throughout of an unnatural accumulation of cell-elements, which in the later stages by their pressure produce various degenerations of surrounding structures, and which, as they occur during the process of bone-formation, are accompanied by irregular and abnormal deposition of lime salts. They especially affect the regions mentioned—the junctions of the epiphyses and diaphyses—because at that time those points are the seat of great physiological activity. Syphilis, indeed, throughout its entire course is notably subject to similar influences, as one example of which I may instance the preference displayed by the periostitis which results in nodes or in caries for the subcutaneous bones, the tibia, clavicle, cranium, etc.; or, in other words, for those which are subject to frequent traumatisms—trifling, perhaps, but sufficient to determine a slight hyperæmia, which is followed by abnormal cell-proliferation or accumulation.
The symptoms which obtain in this condition of syphilitic osteo-chondritis are as follows: The child may be attacked during intra-uterine life, and in that event the osseous lesions will probably be coincident with other syphilomata and with placental disease of sufficient gravity to destroy life.116 If the child is born alive, the first development of the disease will probably be noticed as a swelling at the diaphyso-epiphysial junction of one of the long bones, which in the emaciated subjects of hereditary syphilis is often visible, and can always be discovered by palpation. The bones most frequently attacked are the humerus, radius and ulna, tibia and femur, but the clavicle, ribs, sternum, and bones of the metatarsus and metacarpus are also often involved, and much more rarely the frontal and parietal. The more pronounced the syphilis of the parents, or the nearer the date of conception to the time at which their infection occurred, the more probable is it that several bones will be affected, and the more unfavorable the prognosis as respects the life of the child. Indeed, it has been noticed that "in stillborn infants and in those dying soon after birth the majority, or even all, of the long bones are affected."117