Augmentation of Dural Defect Repairs Strength With an Acrylic Plate in a Porcine Ex Vivo Model

Abstract

Background Large skull base defects can be challenging to repair. This study uses a controlled ex vivo model to examine the failure pressures of various dural repairs of large skull base defects using mucosa with fibrin glue under 3 conditions: No Additional Support of the repair, support with a Foley catheter (Direct Support), and with Foley catheter contact over a rigid acrylic plate (Diffuse Support). Methods Failure pressures of dural repairs with and without support were determined in a porcine model using an ex vivo closed testing apparatus. In addition, 20 mm × 15 mm dural defects were created. Skull base repairs were performed using porcine dura as an underlay graft followed by a septal mucosa overlay. Saline was infused at 30 mL/h, applying even force to the underside of the graft until repair failure occurred for each condition (none, direct, and diffuse support). Five trials were performed per repair type for a total of 15 repairs. Results The mean failure pressures were as follows: No Additional Support, 6.494 ± 2.553 mm Hg; Direct Support, 5.103 ± 3.913 mm Hg; and Diffuse Support, 15.649 ± 2.638 mm Hg. A post hoc Bonferroni-Holm test demonstrated significant difference between No Additional Support and Diffuse Support ( P = .001), as well as Direct Support and Diffuse Support ( P = .002). Conclusion Support of dural repairs in this model withstood higher pressures when the Foley catheter’s support is distributed evenly using a flat acrylic plate. Use of this plate is the only repair tested in this model that tolerated normal adult supine intracranial pressures.