HYPERGRAVITY EFFECTS ON NORMAL AND AVULSED DEVELOPING AVIAN RADII

  • 1 January 1976
    • journal article
    • research article
    • Vol. 47  (8) , 821-825
Abstract
Rhode Island Red female chicks were subjected to complete closed fracture of the right radius at 2 wk post-hatching. The animals were allowed to heal for 1 wk at either earth gravity or 2 G hypergravity state with control and estrogen(estrone)-injected groups. Intact and fractured radial length, weight, average epiphysial-diaphysial diameters, and length, width, and weight of healing fracture callus were measured. Daily 2000 IU estrogen administration for 7 days increased intact radial length. Estrogen augments the effects of the 2-G state by inhibiting growth and depleting the mass of both intact and fractured radii and by decreasing the average distal epiphysial diameter of fractured bones. Animals exposed to the hypergravity state without hormonal treatment showed decreased fractured radial length, weight, and smaller proximal epiphysial diameters. The measurable parameters of the fracture callus (width, length, and weight) were depressed by the hypergravity state regardless of whether the animal was untreated or supplemented with estrogen.

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