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The Effect of Growth on Femoral Torsion AN EXPERIMENTAL STUDY IN DOGS
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From the Department of Orthopedic Surgery and the Isaac Albert Research Institute of the Jewish Chronic Disease Hospital, Brooklyn
1963 by The Journal of Bone and Joint Surgery, Incorporated
J Bone Joint Surg Am, 1963 Oct 01;45(7):1439-1449
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An external or internal torsional deformity of the femur was produced in twenty-two puppies by performing an osteotomy high in the femoral shaft between marker pins which were aligned to provide a permanent record of the amount of rotation resulting from the operation.

After sacrifice of the animals, two to five months later, the residual torsion of the osteotomized femur after this period of growth was determined by comparison with the torsion measured in the contralateral limb.

It was found that some degree of correction of torsional deformity occurred in all the animals with substantial growth. The average amount of external rotation produced at operation in fourteen animals was 43 degrees. The average residual torsion in this group at autopsy was 19 degrees, an average correction of 56 per cent. The comparable figures for eight puppies with internal torsional deformity were: an initial deformity of —33 degrees was found at autopsy to measure —14 degrees, a correction of 58 per cent. Most of the experimental femora showed mild asymmetry of the head. The findings in eight control animals with high femoralshaft osteotomy tended to verify the validity of the technique of measurement employed in the experiment.

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    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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