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American Journal of Roentgenology, Vol 173, 1383-1386, Copyright © 1999 by American Roentgen Ray Society

ARTICLES

MR imaging of subchondral osteonecrosis of the vertebral body after percutaneous laser diskectomy

H Tonami, M Kuginuki, Y Kuginuki, M Matoba, H Yokota, K Higashi, I Yamamoto and Y Nishijima
Department of Radiology, Kanazawa Medical University, Kahoku, Ishikawa, Japan.

OBJECTIVE: We describe four cases of subchondral osteonecrosis of the vertebral body that occurred after percutaneous laser diskectomy. Follow-up MR imaging after laser intervention showed abnormal findings in the vertebral body immediately adjacent to the site of diskectomy that are consistent with subchondral osteonecrosis. CONCLUSION: MR imaging features of this complication include a wedge-shaped low signal intensity on T1-weighted images, high and low signal intensities on T2- weighted images, and a contrast-enhanced area corresponding to high signal intensity on T2-weighted images. Possible causative mechanisms include thermal injury and photoacoustic shock.
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Copyright © 1999 by the American Roentgen Ray Society.