. A radiographic atlas of the pathologic changes of bones and joints . r or lesser portions of the bonemay ensue with the formation of larger or smaller sequestra(PlatesXVI, XVII, XVIII). In more malignant cases the entire bone marrow becomes in-volved. The cancellous tissue of one or both of the epiphysesusually becomes involved and secondary involvment of the jointmay result (Plate XIX). In young persons the epiphyses veryfrequently become separated from the diseased shaft by the de-struction of the cartilage which binds them together (Plate XX). — 54 — PLATE XV. OSTEOM\EI-ITIS OF THE LOWER


. A radiographic atlas of the pathologic changes of bones and joints . r or lesser portions of the bonemay ensue with the formation of larger or smaller sequestra(PlatesXVI, XVII, XVIII). In more malignant cases the entire bone marrow becomes in-volved. The cancellous tissue of one or both of the epiphysesusually becomes involved and secondary involvment of the jointmay result (Plate XIX). In young persons the epiphyses veryfrequently become separated from the diseased shaft by the de-struction of the cartilage which binds them together (Plate XX). — 54 — PLATE XV. OSTEOM\EI-ITIS OF THE LOWER END OF THE HUMERUS. At the lower end ot the Inimerus, a short distance above the epiphysealline, can be seen a light shadow, due to softening of the bone marrowand to a suppurative osteitis. The medullary cavity is enlarged, because of the destruction and lossof substance of the cancellous tissue of the bone, caused by the ostconiyc-litic process. The light affected area is circumscribed by a dark zone of bone sclerosis. The periosteum is swollen and PLATE XV. ■ 56- PLATE XVI. \-EUTIS OF THF, RADIUS—PRESENCE OF SEQUESTRUM. The periosteum is swollen and ccdematous around the afifected areaof the radius. The hone is swollen, and a dark and dense area of hone sclerosis cir-cumscribes the lighter area of bone and marrow suppuration. Within this light area is seen a small sequestrum, the result of bonenecrosis.


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