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Dural signs
 A patient with a lumbar internal derangement frequently shows dural signs in the functional examination. Those dural signs are pathognomic for a disco-dural conflict.
Dural signs in the lumbar spine are :
The patient performs a flexion in standing and produces some back or gluteal pain ; an accessory neck flexion makes this pain worse or better
or, flexion in standing is negative and on accessory neck flexion lumbar or gluteal pain is produced
or, a straight leg raise is e.g. end range painful and an accessory neck flexion increases or decreases the pain
a crossed straight leg raise is also a nice example : the e.g. left SLR produces pain on the right side of the back
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