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Pathomorphological changes in the nucleus pulposus, intervertebral discs, and annulus fibrosus. (a) Intervertebral disc tissues in the sham group and the IDD group 2 W, 4 W, and 8 W after operation were stained by HE (sagittal) (×100). (b) The annulus fibrosus and nucleus pulposus in the sham group and the IDD group 2 W, 4 W, and 8 W after operation were stained by Masson (×100). HE: hematoxylin–eosin.
