American practice of surgery : a complete system of the science and art of surgery . emur at the timeof birth is wholly cartilaginous: the trochanter major, the neck, and the head TUBERCULOUS DISEASE OF BONES AND JOINTS. 625 form a continuous piece of cartilage which caps the osseous extremity of theshaft. The head lies in the acetabular fossa, and the acetabulum at this periodof development is also cartilaginous to a very large extent. In Fig. 247 we havea frozen section through the hip joint of a child one year old; a centre of ossi-fication has appeared in that part of the cartilage which i
American practice of surgery : a complete system of the science and art of surgery . emur at the timeof birth is wholly cartilaginous: the trochanter major, the neck, and the head TUBERCULOUS DISEASE OF BONES AND JOINTS. 625 form a continuous piece of cartilage which caps the osseous extremity of theshaft. The head lies in the acetabular fossa, and the acetabulum at this periodof development is also cartilaginous to a very large extent. In Fig. 247 we havea frozen section through the hip joint of a child one year old; a centre of ossi-fication has appeared in that part of the cartilage which is to form the entire thickness of the floor of the acetabulum at its centre is seen to becartilaginous; this constitutes the Y cartilage/ which persists between theindividual elements of the hip bone which meet in the acetabular fossa. Osse-ous union of the three elements of the hip bone is not completed until the timeof puberty. It is not until the sixth year that the extension from the shaftof the bone which forms the neck develops sufficiently to cut off the cartilage. Fig. 255.—Section through the Hip Joint of a Child Nine Years of Age, showing the Epiphysis of theHead of the Femur separated from the Neck by Cartilage. (Original.) forming the great trochanter from that of the head; it is during the fourthyear that an ossific centre for the trochanter appears. Fig. 255 is a photographfrom a frozen section of the hip joint of a child nine years of age; it will beseen that the head is separated from the shaft by an epiphyseal line of carti-lage. The layer of cartilage separating the head from the neck presents acurved outline in the section, the reason being that the layer of cartilage inquestion, with the adjacent portion of the osseous head, is concave toward theneck of the bone; this prevents separation of the epiphysis by traumatism,although separation along this line by tuberculous disease is not epiphyseal cartilage separating the head disappears
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Keywords: ., bookauthorbuckalbe, bookcentury1900, bookdecade1900, bookyear1906
