ID 110633
Author
Henmi, Tatsuhiko Department of Orthopedic Surgery, Health Insurance Naruto Hospital
Sairyo, Koichi Department of Orthopedic Surgery, The University of Tokushima School of Medicine Tokushima University Educator and Researcher Directory KAKEN Search Researchers
Nakano, Shunji Department of Orthopedic Surgery, The University of Tokushima School of Medicine
Kanematsu, Yoshiji Department of Orthopedic Surgery, Health Insurance Naruto Hospital
Kajikawa, Tomomasa Department of Orthopedic Surgery, Health Insurance Naruto Hospital
Katoh, Shinsuke Department of Orthopedic Surgery, The University of Tokushima School of Medicine Tokushima University Educator and Researcher Directory KAKEN Search Researchers
Goel, Vijay K Department of Biomedical Engineering, The University of Toledo
Keywords
MRI
Lumbar Spine
Nucleus pulposus
Herniation
Content Type
Journal Article
Description
We studied the natural history of extruded lumbar intervertebral discs using MRI. Forty-nine patients with lumbar disc herniation were included in this study. Ages ranged from 19 to 57. On the T2-weighted sagittal MR image, the signal intensity in the herniated mass was measured and the ratio to that in the original nucleus (i.e, nucleus pulposus from which they extruded) was calculated (signal intensity ratio ; SIR). The relationship with SIR and duration of illness was evaluated. In ten patients who were re-examined by MRI after conservative treatment, the size of the herniation measured by T1-weighted axial MR image was compared before and after treatment. The signal intensity of HNP became higher than that of the original nucleus immediately following herniation and thereafter decreased with time, suggesting that initial hydration of the HNP occurred shortly after herniation followed by dehydration of the HNP. The size of the HNP with a SIR value of 1.2 and higher on T2-weighted MR images decrease with time, however, the HNP with a SIR below 1.2 did not show any size reduction. The SIR of 1.2 and higher is a good indicator predicting spontaneous reduction of the HNP. Dehydration in the HNP may play an important role in the reduction of the lumbar disc herniation.
Journal Title
The journal of medical investigation : JMI
ISSN
13431420
NCID
AA11166929
Volume
49
Issue
1-2
Start Page
40
End Page
43
Sort Key
40
Published Date
2002
EDB ID
FullText File
language
eng
TextVersion
Publisher
departments
Medical Sciences
University Hospital