Timothy J. Jackson, M.D.  Arthroscopy Techniques 

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Endoscopic Sciatic Nerve Decompression in the Prone Position—An Ischial-Based Approach  Timothy J. Jackson, M.D.  Arthroscopy Techniques  Volume 5, Issue 3, Pages e637-e642 (June 2016) DOI: 10.1016/j.eats.2016.02.020 Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

Fig 1 Portal placement and positioning. The patient is placed prone on a radiolucent table. The hips are slightly flexed to allow for maneuverability of instruments. The gluteal crease is marked before prepping and marks the location for the portals. A more lateral portal is created first, 2 to 4 cm lateral to the lateral border of the ischium. Portals are marked with a red line. Arthroscopy Techniques 2016 5, e637-e642DOI: (10.1016/j.eats.2016.02.020) Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

Fig 2 Anteroposterior fluoroscopic images of the operative hip in the prone position. Several steps can be aided with use of fluoroscopy. (A) The lateral portal is used for initial access. Image showing the trocar aimed at the ischium (asterisk), striking the ischium (green plus), and not plunging deep into the neurovascular structures. Tactile feedback and fluoroscopic imaging confirm the location of the trocar. (B) Fluoroscopic image taken during ischial bursectomy to confirm the location of instrumentation. Note that the 70° arthroscope is in the lateral portal and is pointed at the ischium as a reference point. The red represents the cone of visualization of the arthroscope. The shaver is placed in the medial portal. The tendon is a “lighthouse” reference point throughout the procedure. The origin of the common hamstring on the lateral border of the ischium is the starting point for dissection, beginning with a shaver to remove bursal tissue laying over the tendon. (C) The arthroscope is in the medial portal and the radiofrequency device is in the lateral portal. The level of release of piriformis tendon bands seen on fluoroscopy. The red triangle simulates the approximate location of the piriformis muscle in relation to the hip image. (D) Fluoroscopic view showing the proximal extent of sciatic nerve decompression reaching the sciatic notch, after starting in the distal aspect of the ischium. Arthroscopy Techniques 2016 5, e637-e642DOI: (10.1016/j.eats.2016.02.020) Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

Fig 3 (A) Endoscopic view at the time of initial bursectomy with the hamstring tendon in the background (asterisk). The camera is in the lateral portal and the shaver in the medial portal. (B) Endoscopic view of the fibrous bands (red X), ischium (asterisk), and neural structures before decompression. The posterior femoral cutaneous nerve can be seen under some thin connective tissue (red rectangle). The blue box highlights the region where the sciatic nerve is located. At this early point in the dissection, the nerve is not visible. (C) Photo in the same view as in B. After release of the fibrous bands, the sciatic nerve (#) and the posterior femoral cutaneous nerve (*) can be seen in their entirety. A leash of vessels is visible traversing the deep gluteal space (x). Arthroscopy Techniques 2016 5, e637-e642DOI: (10.1016/j.eats.2016.02.020) Copyright © 2016 Arthroscopy Association of North America Terms and Conditions