Following a fall, the patient had a huge defect involving the orbital roof.
Based on the high-resolution CT scan of the patient (0.5mm slice thickness), we reconstructed the anatomy in 3D. This first step is called segmentation and is performed by selecting the Hounsfield units (level of grey) corresponding to bone on the CT scan.
A mirror is first created (in red).
The osteotomy of the superior orbital rim (in orange) is simulated and the mirror is used to repositioned the superior orbital rim.
The symmetry is restored
Two patient-specific implants were designed, based on the mirror.
The patient-specific implants had a complementary shape to facilitate positioning. One implant reconstructs the orbital roof and the other one reconstructs the defect in the frontal area.
Both of them would be 3D printed in titanium alloy (Ti6Al4V).