A Novel Patient-specific Titanium Mesh Implant Design for Reconstruction of Complex Orbital Fracture.

UNLABELLED: Complex orbital fractures, including orbital rims and walls, require precise reconstruction. A titanium-based patient-specific implant (PSI) benefits over other implants when challenged with narrow surgical space and designable implant fixation point.

METHODS

This is a prospective noncomparative case series to evaluate the effect of complex orbital reconstruction using the newly designed lateral fixation patient-specific implant. The PSI was individually fabricated by 3D reconstruction using the mirrored nonaffected orbit as a template. The fixation point was at maxillary or zygomatic bone, depending on the bony remnant. Outcomes were obtained from computed tomography scan to compare orbital tissue volume and exophthalmometry value by posterior clinoid method before and after the surgery and also between both orbits in each patient.

RESULTS

Sixteen patients with complex orbital fracture with inferior orbital rim defect were enrolled. Seven were previously repaired with other implants. Compared with the preoperative measurement, the postoperative mean difference of orbital volume and exophthalmometry value between both eyes was significantly decreased (reduction of the mean difference of 2904.40 mm3; P < 0.001 and 2.89 mm; P < 0.001, respectively). The mean orbital volume and exophthalmometry value between affected and unaffected eyes were not different after surgical correction (P = 0.57 and P = 0.28, respectively). There was one infected wound from retained foreign body and one unresolved vertical diplopia after the reconstruction.

CONCLUSIONS

Reconstruction of complex orbital fractures using the novel designed-PSI had excellent outcomes. Appropriate implant design with caution of orbital anatomy and placement techniques are keys for successful results.