This material shows a process of making portals in BESS ( Biportal endoscopic spinal surgery), IPA: ipsilateral posterior approach. If you want to see other steps, please let me know. I will reply you with a videoclip. Thanks. During the procedure, the following points are shown: 1.(Level check. Drawing interlaminar space.) Skin incision - Fascia cut : cross cut for fluent saline flow. 2. Scatching off the back muscle, but only in the interlaminar space. : Don't touch the muscles overlying the lamina! 3. Checking if the saline flow is fluent or not.
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