Study on the influence of the injury of epiphysis to metaphysis in young growing rats.

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The influence of partial excision at the proximal epiphysis of the tibia to metaphysis in young growing rats were investigated from 2 days to 8 weeks after excision by roentgenological and histological methods.The results were as follows;1) The longitudinal bone growth of experimental tibia was slightly inhibited while the transverse diameter of metaphysis was remarkably increased compared with normal controls.2) At 2 and 4 days after operation the calcified cartilagenous septa were not seen in the primary spongiosa and many osteoblastic cells were transversely oriented along the growth plate metaphyseal junction. Then at 1 week after operation the calcified cartilagenous septa newly projected into the primary spongiosa, which were shorter in length and thicker in width than normals. Until 4 weeks they gradully increased in length and became same as normals. The peripheral trabeculae of the metaphyseal primary spongiosa which were located under excited epiphysis were arranged obliquely from 2 to 4 weeks. Since 1 week the cells of the deep proliferative zone of cartilagenous epiphysis and the marginal germinative zone of epiphyseal plate were remarkably increased in size and number.
西日本整形・災害外科学会の論文