. Diseases of bones and joints . Fig. showing tuberculosis of the marrow (C) directlybeneath the cartilage (B). The cartilage has been lifted off en masse,and its surface is fibrillated. A—bone trabeculae. The outer layer of the periosteum serves as anenvelope for the bone, and may be disregarded ex-cept for its mechanical function. At the ends of the long bones, where the jointcartilage begins, the fibrous layer of the periosteumis continuous with the ligament. For our purposes io DISEASES OF BONES AND JOINTS the inner layer may be regarded as continuous withthe synovia. the
. Diseases of bones and joints . Fig. showing tuberculosis of the marrow (C) directlybeneath the cartilage (B). The cartilage has been lifted off en masse,and its surface is fibrillated. A—bone trabeculae. The outer layer of the periosteum serves as anenvelope for the bone, and may be disregarded ex-cept for its mechanical function. At the ends of the long bones, where the jointcartilage begins, the fibrous layer of the periosteumis continuous with the ligament. For our purposes io DISEASES OF BONES AND JOINTS the inner layer may be regarded as continuous withthe synovia. the joint. We now come to a consideration of the joint, andshall take for our example a simple joint betweenthe ends of two long bones. All others are onlymodifications of this. c Definition. Fig. showing intense tuberculosis inflammation of themarrow (A). B—dead bone trabeculae. C—degenerating inflammation is making its way into the marrow at the marginof the articular cartilage, destroying the bone and cartilage as itadvances. Low power. A joint is a closed cavity between two bones,bounded by two tissues, the cartilage and the cap-sule. Where one begins the other ends. Cartilage may be regarded as bone in embryo andin potentiality. It is composed of cells and base- DISEASES OF BONES AND JOINTS 11 ment substance. The latter appears to be homo-geneous, but this homogeneity, due to its cementsubstance, is only apparent. If the nutrition of thecartilage is disturbed, or if the joint be put at rest, The Cartilagethe real fibrous nature of the basement substancebecomes evident. Deep in the cartilage the fibresare at right angles to the surface, but more super-ficially, parallel to it. I have never been able toidentify a perichondrium of an a
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbon, booksubjectbones
