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Fig 1.

Disc herniation type.

A: Normal. B: Prolapsed. C: Extrusion. D: Sequestration.

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Fig 1 Expand

Fig 2.

Extension of herniated disc.

A. Central type. B. Subarticular type. C. Foraminal type. D. Extraforaminal type.

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Fig 2 Expand

Fig 3.

Disc degenerative grading from grade I to grade V.

A: Disc degenerative grading by T2-weighted MRI. B: Disc degeneration graded by homogeneity of the nucleus pulposus, demarcation between the nucleus pulposus and annulus fibrosus, intensity of the nucleus pulposus, and disc height. NP: Nucleus pulposus. AF: Annulus fibrosus.

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Fig 3 Expand

Table 1.

Patient characteristics.

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Table 1 Expand

Table 2.

Factors related to fair/poor MacNab score.

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Table 2 Expand

Table 3.

Factors related to re-operation rate.

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Table 3 Expand