How to stretch the Sciatic nerve and mobilization Technique?

Neural Testing and Mobilization Techniques for the Lower Quadrant:

Sciatic Nerve:
     Straight leg Raising with Ankle Dorsiflexion:

Patient position and procedure: 

The patient is supine. Lift the lower extremity in the straight-leg raise (SLR) position and add ankle dorsiflexion. Several variations may be done; ankle dorsiflexion, ankle plantar flexion with inversion, hip adduction, hip medial rotation, and passive neck flexion.

The maneuver may also be performed long-sitting and side-lying. These various positions of the lower extremity and neck are used to differentiate tight or strained hamstrings from possible sites of restriction or nerve mobility in the lumbosacral plexus and sciatic nerve.

 Once the position that places tension on the involved neurological tissue is found, maintain the stretch position and then move one of the joints a few degrees in and out of the stretch position, such as ankle plantarflexion and dorsiflexion or knee flexion and extension. Ankle dorsiflexion with eversion places more tension on the tibial tract. Ankle dorsiflexion with inversion places tension on the sural nerve. 

Ankle plantarflexion with inversion places tension on the common peroneal tract. Adduction of the hip while doing SLR places further tension on the nervous system because the sciatic nerve is lateral to the ischial tuberosity; medial rotation of the hip while doing SLR also increases tension on the sciatic nerve (see Fig. 13.16). Passive neck flexion while doing SLR pulls the spinal cord cranially and places the entire nervous system on a stretch.