Intranasal Outer Cortex Splinting With a Kirschner Wire to Immobilize Reduced Buckle-out Segments in Nasal Fractures.

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High-velocity lateral impacts to the nose sometimes cause nasal buckle-out fractures with a trapdoor buckle-out segment displaced outwards. Prolonged immobilization of a reduced buckle-out segment at risk for outward redisplacement remains challenging. Here we introduce a novel method of intranasal outer cortex splinting with a Kirshner (K)-wire to reinforce the reduced state and prevent outward re-displacement of the buckle-out segment. Eighteen patients with nasal buckle-out fractures underwent outer cortex K-wire splinting to securely immobilize a reduced but unstable buckle-out segment after indirect open reduction through intercartilaginous incisions and inner cortex K-wire splinting. A thin K-wire (diameter 0.8mm) was inserted at the vestibule, passed above the upper lateral cartilage and the outer cortex of the reduced buckle-out segment, and extended to the cephalic non-fractured bone. The wire served as a crossbeam, effectively supporting the reduced buckle-out segment. All K-wires for inner and outer cortex splinting were removed 10 to 14 days postoperatively. Immediate postoperative computed tomography scans showed successful immobilization of buckle-out segments in 17 patients (94.5%). Postoperative 6-month scans of 7 patients showed excellent maintenance and bony alignment of buckle-out segments in all cases. Sixteen patients (88.9%) were satisfied with the overall external nasal contour at the last follow-up. There were no complications directly related to outer cortex K-wire splinting. One patient complained of a focal lateral protrusion resulting from the under-correction of a buckle-out segment. This technique may be a valuable option for immobilizing and maintaining reduced nasal buckle-out segments until a stable bony union is established.