[Clinico-radiological study of the centers of instantaneous rotation of the lumbar spine].
The author, after a description of CIR's modality of calculus and its mathematical principles, underlines application of such method in diagnosis of lumbar-sacral pathology. A new spine's conception springs from this study: the "motor segment" with its functional and anatomical aspects. This interpretation gives us a new study's method of the lumbar-sacral dynamic and its pathology.
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