Less Invasive Combined Micro- and Endoscopic Neurolysis of Superficial Peroneal Nerve Entrapment: Technical Note

As superficial peroneal nerve (S-PN) entrapment neuropathy is relatively rare, it may be an elusive clinical entity. For decompression surgery addressing idiopathic S-PN entrapment, narrow- area decompression may be insufficient and long-area decompression along the S-PN from the peroneus longus muscle (PLM) to the peroneal nerve exit site may be required. To render it is less invasive, we performed S-PN neurolysis in a combined microscope/endoscope procedure. We report our surgical procedure and clinical outcomes. We microsurgically decompressed the affected S-PN under local anesthesia without a proximal tourniquet. We made a small linear skin incision at the distal portion of the S-PN, performed distal decompression of the S-PN where it penetrated the deep fascia, and then performed proximal decompression under an endoscope. At the site where the S-PN exited the PLM, we placed additional small incisions and proceeded to microscopic decompression. We surgically treated three patients with S-PN entrapment. They were two men and one woman ranging in age from 66 to 85 years. The mean postoperative follow-up was 22 months. Their symptoms before treatment and at the latest follow-up visit were recorded on the numerical rating scale (NRS). The mean incision length was 5.5 cm and 17.3 cm of the S-PN was decompressed. All three patients reported postoperative symptom improvement. There were no complications. In patients with idiopathic S-PN entrapment, long-site neurolysis under local anesthesia using a microscope/endoscope combination is useful.