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Journal of Bone and Joint Surgery, 1950;32:180-188.
© 1950 by The Journal of Bone and Joint Surgery, Inc

THE MECHANISM OF ROTATION IN COMBINATION WITH LATERAL DEVIATION IN THE NORMAL SPINE

ALVIN M. ARKIN M.D.1

1 Orthopaedic Service of Mount Sinai Hospital, New York City

1. The intrinsic mechanism for rotation in combination with lateral deviation in the normal spine depends upon soft-tissue tensions rather than upon the arrangement of the spinal articular facets. The behavior may be summarized by stating that the structure under the greater tension will describe the straighter line.

2. Thirty-nine roentgenograms of five subjects showed a tendency to convex-side rotation in both flexion and extension of the laterally deviated living spine.


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