. A radiographic atlas of the pathologic changes of bones and joints . PLATE XXXVI. I05 — PERIOSTITIS. (Plate XXXVII) : Periostitis can only be distinuished onthe radiogram when there is considerable thickeining of the peri-osteum or some exudate existing between it and the bone. It isthen recognized as a circumscribed shadow, darker than the nor-mal soft parts. This shadow may be large or small, entirelysurround the bone or appear only as a raised dark shadow uponone of the bone surfaces. If there is secondary involvement orcaries of the bone this will also show plainly in the r
. A radiographic atlas of the pathologic changes of bones and joints . PLATE XXXVI. I05 — PERIOSTITIS. (Plate XXXVII) : Periostitis can only be distinuished onthe radiogram when there is considerable thickeining of the peri-osteum or some exudate existing between it and the bone. It isthen recognized as a circumscribed shadow, darker than the nor-mal soft parts. This shadow may be large or small, entirelysurround the bone or appear only as a raised dark shadow uponone of the bone surfaces. If there is secondary involvement orcaries of the bone this will also show plainly in the results of periostitis, the formation of fibrous or osseoustissue between the periosteum and the bone, can also be plainlyseen as dark circumscribed areas next the bone. — io6 — PLATE XXXVII. PERIOSTITIS OF THE TIBIA. The periosteum is swollen and raised, and there is an exudate betweenit and the anterior surface of the tibia. The darker circumscribed area on the anterior border of the bone is anew bone formation, caused by the PLATE XXXVII. — I09 — RICKETS. Rickets is recognized by the pale bone shadow, the enlargedmedullary canal and the bending of the epiphyses or the shaftor both of the long bone. The condition usually occurs during the first two years of life,but it may be congenital or may occur as late as the twelfth calcification does not take place. At the same time, thedilatation of the medullary cavity goes on irregularly and often toan excessive degree. The cartilaginous and sub-periosteal cellsgrow with increased rapidity and exhuberance and in an irregularmanner. As a result the bones do not possess solidity and cannotresist the traction of the muscles (Plate XXXVIII) or outsidepressure. The epiphyses may be displaced or bent, especially inthe ribs, less frequently in the long bone. The long bones or thepelvic bones may be bent in a variety of forms (Plates XXXIX,XL). PLATE XXXVIII. KACHITIC BONES. The shadow of the bones is pale
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