連続衝撃の幼若家兎大腿骨に及ぼす影響
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概要
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Strong continuous impingement was given to young rabbits with or without cutting the blood vessels entering into the femoral head from the posterior part of the capsule, and its effect on the bone, especially on the growing zone, was studied.<BR>The experimental animals used were of 2 weeks old, weighting 200-250g. A continuous impingement of 300 times in a minute was given for 10 minutes every day onto the femur along to the long axis at the knee joint. The following results were obtained.<BR>1) On giving the continuous impingement, the ossification was disturbed and marked change was recognized especially at the epiphyseal cartilage of the neck. Histologically the zone of resting cartilage and the zone of young proliferating cartilage decreased in their width, while the zone of maturing cartilage and the zone of calcifiing cartilage increased in their width. Trabeculae of the metaphysis became atrophic with thinned cortex.<BR>2) In the group with the cutting of the blood vessels, their changes were marked. Histologically, not only the zones of resting and young proliferating cartilages but also the zone of maturing cartilage decreased in their width.<BR>3) The union at the transitional zone between the femoral head and the great trochanter was prolonged.<BR>4) The articularcartilage also thickened more than that of the contorl group because of a disturbance in ossification.<BR>5) Coxa vara increase during the continuous impingement. In the group with the cutting of the blood vessels, the ante-torsion of the femoral neck increased until the third week, but decrased thereafter. Thus, the increase in the ante torsion seemed to be related to the position of the Femur in the rabbits.<BR>6) In this experimeht, no effect of the impingement was recognize the Length of the bone, but its slight increase was recognized in the group with the cutting of the blood vessels, the imp-ingement demonstrated no bone destruction, fibrosis nor cartilagenous callus in the femoral head.
- 学校法人 昭和大学・昭和医学会の論文