2025 Poster Presentations
P029: OUTCOMES OF 3-DIMENSIONAL PRINTED CUSTOM POROUS POLYETHYLENE ORBITAL IMPLANT FOR RECONSTRUCTION IN A TERTIARY REFERRAL CENTER
Hakan Demirci1; Almila Sarigul Sezenoz, MD2; Sarinee Juntipwong1; Zhengyang Zhao1; Christine Nelson1; Denise Kim1; 1Department of Ophthalmology and Visual Sciences, University of Michigan; 2Department of Opthalmology, Baskent University
Purpose: To assess surgical outcomes of 3-dimensional (3D) printed custom porous polyethylene cast-molded orbital implants with the use of digital mirroring from the contralateral orbits in diverse orbital reconstruction settings.
Methods: A retrospective chart review of patients receiving 3D-printed custom orbital implants at a single tertiary center from 2020 to 2023 was performed. Each patient had undergone a detailed ophthalmologic examination and was evaluated radiologically by using thin-slice multiplanar CT imaging preoperatively. For each patient, high-resolution CT scans were utilized to generate 3D models of their existing bony structures (Figure 1). The contralateral orbit's 3D shape on the CT scan was digitally mirrored to the affected side (Figure 2). Subsequently, a skull was 3D printed, and a custom porous polyethylene implant (Stryker, Kalamazoo, MI) was fabricated via cast-molding to achieve the intended normal orbital contour, with the implant designed to fill the defect in comparison to the contralateral side (Figure 3). Patient data included demographics, preoperative computed tomography findings, pre- and postoperative clinical features, surgery duration, and surgical complications.
Results: A total of 8 patients (5 male, 3 female) were included in the study. The mean age of patients was 47.8 years (range 23-73 years). Indications for surgery were diplopia, enophthalmos, hypoglobus, orbital, or facial deformities after significant trauma or tumor removal. One patient had bilateral orbital defects due to orbital blow-out fractures while others had unilateral orbital defects. The mean follow-up time was 27.88 ± 9.66 months (Range: 7-38 months). Trauma accounted for 6 (75%) cases, silent sinus syndrome for 1(12.5%) and facial deformity for after tumor resection for 1 (12.5%). Orbital fractures most commonly involved the orbital floor (n=6, 100%), followed by medial (n=2, 33.3%), and lateral walls (n=1, 16.6%). The mean surgery duration was 183.4 minutes (range 61-245), with 66.7% of trauma cases (n=4/6) needing prior hardware removal. Postoperative improvement was seen for enophthalmos in 7 of 8 cases, hypoglobus in 3 of 5 cases, and diplopia in 3 of 4 cases, and the average exophthalmometry asymmetry improved from 3.1 mm to 0.5 mm.
Conclusion: 3D printed custom orbital implants designed using contralateral orbit mirroring techniques demonstrated effectiveness and safety in this diverse series of orbital reconstruction cases, yielding significant improvements in enophthalmos, hypoglobus, and diplopia even in the presence of bilateral orbital defects. This study supports the use of 3D printed custom orbital implant use for a variety of complex orbital reconstruction indications.