J Korean Soc Spine Surg.  2002 Mar;9(1):14-18. 10.4184/jkss.2002.9.1.14.

Significance of Space-Occupying Ratio According to MRI Finding in Lumbar Disc Herniation

• Lee KY
• Sohn SK
• Kim CH
• Lee JW

• KMID: 1897085
• DOI: http://doi.org/10.4184/jkss.2002.9.1.14

Abstract

STUDY DESIGN: Clinical significance of space-occupying ratio according to MRI finding in lumbar disc herniation.
OBJECTIVES
To estimate relationship between patient's symptoms and space-occupying ratio in herniated lumbar vertebral disc in MRI according to JOA scoring system. SUMMARY OF LITERATURE REVIEW: Using MRI, herniated intervertebral disc may be estimated with the extent of derangement of the constituents of the disc. Symptoms and signs did not correlate with the degree of reduction of the herniation in MRI. MATERIAL AND METHOD: A retrospective analysis was performed upon 99 patients that underwent lumbar spine MRI. The degree of the occupied spinal canal was measured by 'Space-occupying ratio', which was the ratio of the longitudinal diameter at the spinal canal to the longitudinal diameter at the herniated nucleus purposus. Each '30% Space-occupying ratio' to '50% Space-occupying ratio' was classified to analysis I, analysis II. Under the percent was group A, above the percent was group B. We estimate the patient's condition related with lower back pain according to JOA scoring system.
RESULTS
The herniation type of the nucleus purposus was classified to 5 protruded type, 62 subligamentous extruded type, 22 transligamentous extruded type, 10 sequestral type. The patients who have above 30% were 62 cases, under 30% were 26 cases in analysis I, have above 50% were 19 cases, under 50% were 69 cases in analysis II. So, there was not distinguished from analysis I to analysis II according to the degree of the herniation. Mean JOA score was 9.307 in group A, mean JOA score was 9.370 in group B in analysis I. Mean JOA score was 9.391 in group A, mean JOA score was 9.315 in group B in analysis II. There was not correlate statistically with analysis I (p value=0.5669) and analysis II(p value=0.5390) using the Wilcoxon score test.
CONCLUSION
There was not correlate statistically with the degree of the herniation in lumbar spine MRI according to JOA scoring system.

Keyword

Space-occupying ratio; MRI; lumbar HNP

MeSH Terms

Humans
Intervertebral Disc
Low Back Pain
Magnetic Resonance Imaging*
Retrospective Studies
Spinal Canal
Spine

Figure

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  Fig. 1. Measurement method for spaceoccupying ratio Fig. 1. The spaceoccupying ratio of the herniated material to the spinal canal, Fig. 1. A/B(spaceoccupying ratio)× 100(%) on axial images, was calculated

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