Abstract

Internal disc disruption (IDD) results from tearing of inner annulus fibers while the external aspect remains intact. This condition occurs traumatically or degeneratively, is not identifiable using non-contrast CT, and induces painful symptoms. Due to its occult nature on routine imaging, IDD may be a source of idiopathic pain in the absence of obvious degenerative changes. The mechanism of pain is related to instability resulting from fundamental changes in segmental load sharing that contribute to discogenic pain mechanisms and acute nerve root compression.

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