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Diagnostic (cont.) MRI: Abnormal if disc herniation or acute ligamentous injury Cervical HNP seen in 10 % of asymptomatic persons under 40 years and 5 % of those over 40 years (Boden, et al JBJS: 1990) Degenerative disc changes present in 25 % of asymptomatic adults under 40 years, 60 % of those over 40 years and 70 % over 70 years CT with/without myelogram Best for bony changes, spinal or foraminal stenosis Previous slide Next slide Back to first slide View graphic version © 1998 Specialty Physicians Alliance. All rights reserved. If you have questions or comments please contact webmaster@spa-ortho.com