Torsional force applied to the tibia of living lambs in an attempt to change the bone rotational axis

PURPOSE: To evaluate the effects of torsional force on the rotational axis of living lamb tibias.METHODS: An external fixator device was designed to apply rotation to the tibias of lambs. Once a week, the bone distal extremity was rotated 2º. After achieving ~20º of internal rotation, the turning wa...

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Bibliographic Details
Published in:Acta cirúrgica brasileira 2014-03, Vol.29 (3), p.193-200
Main Authors: Volpon, José Batista, Falcai, Maurício José, Moro, Carlos Alberto, Leal, Daniel Mendes
Format: Article
Language:English
Subjects:
Bone Malalignment
Orthopedic Fixation Devices
Sheep
Tibia
Torsion, Mechanical
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Summary:PURPOSE: To evaluate the effects of torsional force on the rotational axis of living lamb tibias.METHODS: An external fixator device was designed to apply rotation to the tibias of lambs. Once a week, the bone distal extremity was rotated 2º. After achieving ~20º of internal rotation, the turning was discontinued and the device was maintained in situ for one month and euthanasia occurred in group A (n=10) after this. In group B (n=9) euthanasia occurred three months after removing the device. Computed tomography scans evaluated the rotational angle; dual-energy X-ray absorptiometry assessed the bone mineral density, and conventional and polarized light microscopy studied the bone microstructure.RESULTS: In group A, the mean angle of the external rotation in the control tibias was 24º and 8º in the twisted tibias (p
ISSN:0102-8650
0102-8650
DOI:10.1590/S0102-86502014000300008