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Needle placement for lumbar discography. (a) Anteroposterior and (b) lateral radiographic projections show the tip of the thicker, shorter outer needle at the posterolateral corner of the annulus fibrosis of the intervertebral disc. The tip of the thinner, longer inner needle is located in the centre of the intervertebral disc. Test injection of contrast agent confirms that the inner needle tip lies in the nucleus pulposus.
