Published online Sep 30, 2001.
https://doi.org/10.4184/jkss.2001.8.3.314
Classification and Imaging Study of the Lumbar Disc Herniation
Abstract
It is known that the lifetime prevalence of low back pain approximates 80%, with long standing low back problems in roughly 10% to 20% of the population. The symptoms of sciatica due to nerve root compression most often relate to aberration of the lumbar intervertebral disc. Lumbar disc herniation is defined as herniation of nucleus and/or anulus fibrosus through the tear of the anulus fibrosus. According to the degree, it has been classified as a bulging disc, a protruded disc, a extruded disc, and a sequestrated disc. Also it has been classified as central, posterolateral, and foraminal herniation by the location of the herniation. The four imaging studies most frequently ordered to evaluate lumbar disc herniation are plain x-ray films, myelography, computed tomography, and magnetic resonance imaging. Each test provides useful information about lumbar disc herniation. However, before the selection of a test, the category of the clinical problem must be defined and imaging abnormalities must be correlated with historical and physical findings. Many errors in decision making with imaging studies of lumbar disc herniation do not come from misinterpretation of what in seen on the images; instead, they are related to how the imaging information is used and integrated into the clinical decision-making process.
Fig. 1
B. Bulging disc. The posterior surface is symmetrically centrally convex and the disc protrudes up to 3 mm beyond the bone surfaces. Anulus fibers are intact. Bulging is clinically insignificant in some circumstances. C. Protruded disc. Disc material extends beyond the normal disc space, usually asymmetrically. The anulus is partially disrupted but still contains displaced disc material, which maintains broad continuity with the parent disc. D. Extruded disc. Displaced disc maintains continuity with the parent disc by a relatively narrow pedicle and is either uncontained or contained by attenuated fibers of a largely disrupted anulus, peridural membrane, or posterior longitudinal ligament. E. Sequestrated disc. Displaced disc material, which may contain elements of nucleus, anulus, and/or cartilage, has no continuity with the disc of origin. F. Intradiscal herniation. Predominantly nuclear tissue has shifted from the center of the disc into a fissure in the peripheral anulus. This concept of herniation differs from those of figures 1-A to 1-E in that the outer contour of the disc remains normal. G. Intravertebral herniation(Schmorl's node). Disc material has herniated through cartilagenous and bony end plate and into the spongiosa of the vertebral body.
A. Normal disc. The posterior surface is slightly concave centrally relative to the plane of the posterior - most projection of the vertebral apophyses.
Fig. 2
Location of disc herniation in the spinal canal
Fig. 3
B. First story disc herniation at the level of the disc space. C. Second story disc herniation. The disc has migrated inferiorly to the third story of the segment below. D. Third story disc herniation. The disc has migrated inferiorly to the third story of the segment below. E. McCulloch's windows of opportunity : Medial interlaminar window and lateral intertransverse window.
A. Three-story house. First story (1) - disc space level, second story (2) - foraminal level, and third story (3) - pedicle level . This concept aids preoperative planning and operative localization.
Table 1
Radiologic abnormalities in the lumbar spine with significance for low back pain
Table 2
Computed tomography results on normal subjects
Table 3
Magnetic resonance imagind results on normal subjects
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