Keep in mind, however, that the term describes the shape of a bone, not its size. Long BonesĪ long bone is one that is cylindrical in shape, being longer than it is wide. Based on this background, the localisation of a bone tumour in a child or adolescent is consid-ered an important factor in treatment planning in order to minimise the risk of stunted growth.Figure 6.6 Classifications of Bones Bones are classified according to their shape. Around the age of 20, bone growth usually stops due to the bony merge of diaphysis and epiphysis, thus closure of the epiphyseal plate.įractures or surgery as well as other mechanical injuries and radiotherapy in the area of the growth plate are associated with the risk of premature closure of the growth plate, which may affect bone growth. The process of of bone formation begins with the proliferation of cartilage cells within the growth plate, followed by a step-by-step replacement of the cartilaginous tissue by bone tissue toward the diaphysis. The epiphyseal plate of a long bone is situated between the diaphysis and its end (epiphysis). Longitudinal growth of the long bones starts at a cartilaginous disk, the so-called growth or epiphyseal plates (endochondral ossification).Long bones expand in diameter, thus become thicker by membranous ossification around their central shaft (diaphysis).
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