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  • Preservation of Facial Nerve During Supraorbital Approaches: A Cadaveric Surgical Simulation Study

    Final Number:
    1697

    Authors:
    Sergio Garcia Garcia MD; Halima Tabani MD; Sirin Gandhi MD; Michael T. Lawton MD; Arnau Benet M.D.

    Study Design:
    Laboratory Investigation

    Subject Category:

    Meeting: Congress of Neurological Surgeons 2017 Annual Meeting

    Introduction: The supraorbital keyhole approach(SOKA) and its variations are used to address a variety of indications. While performing these approaches, inferolateral extension of the skin incision endangers the temporal branch of facial nerve(FN), leading to transient or permanent facial palsy. This study aimed to define a safety area for preserving the temporal branch of FN during supraorbital approaches via an eyebrow incision

    Methods: A bicoronal incisión was performed in 3 cadaveric heads and the main branches innervating the frontooccipitalis(FO), and orbicularis oculi(OO) were identified and followed proximally until the temporofacial division of the main stem of FN. The supraorbital notch(SON) was exposed bilaterally and linked by a thread defining an X-axis of coordinates. Another thread was placed in the lateral aspect of the orbitozygomatic junction(OZj) defining the Y-axis. Coordinates(x,y) were assigned to the origin of FN and all its subdivisions. A safety area, where no branches were found lateral to the orbital rim was outlined, with four coordinates represented in a single pooled Cartesian space. Probability to find a FN branch was calculated for each 5mm eccentric to this zone

    Results: FN dissection was successfully conducted in 6specimens and an intricate pattern of innervation was observed, with multiple interconnections between the main temporal branches. A safety area where no branches were found was defined, 8mm superior and 10 mm inferior along the vertical axis crossing the OZj. These distances could be safely extended 39mm lateral to the SON(Figure 1). Beyond these limits, the probability of injuring a branch of the FN was higher while extending the incision inferolaterally

    Conclusions: We define a safety área for performing the skin incisión for SOKA. The probability of FN injury increases beyond the área defined. However, given the dense interconnections, transection of some of these distal branches would not result in a permanent palsy of OO or FO

    Patient Care: The use of data provided in this study will help prevent inadvertant iatrogenic injury to the facial nerve and its branches while using the supraorbital approach and its variations. This will help in reducing morbidity due to facial nerve damage during surgery, leading to better clinical outcomes for patients

    Learning Objectives: 1. To understand the anatomy and course of facial nerve and its branches 2. To identify safe entry zones to be used while using the supraorbital approach and its variations, in order to prevent inadvertent damage to facial nerve and its branches

    References:

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