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Fig. 5A. —40-year-old man with L5 radiculopathy undergoing lumbar diskography with needle placement through safe window. Oblique radiograph of lumbar spine obtained during L4–L5 diskography, shows safe window (triangle) to be formed by superior articular facet medially, superior endplate of lower vertebra inferiorly, and imaginary line joining tip of superior articular facet and superolateral tip of vertebral body.

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