Custom implant design for large cranial defects.

Area of Science:

• Neurosurgery
• Biomedical Engineering
• Medical Imaging

Background:

• Large cranial defects pose significant reconstructive challenges.
• Preoperative custom implant fabrication is crucial for optimal outcomes.
• Accurate implant design is complex and defect-size dependent.

Purpose of the Study:

• Introduce a computer-aided design (CAD) tool for large skull defect implants (>100 cm²).
• Enable functional and aesthetically correct custom implant design.
• Address challenges in crafting precise shapes for large cranial defects.

Main Methods:

• Utilize geometric morphometrics and radial basis functions (thin-plate splines) for semiautomatic implant generation.
• Employ symmetry and best-fit shape analysis to estimate missing data within radiologic volumes.
• Implement a boundary fitting approach for accurate implant placement.

Main Results:

• The CAD tool generates smooth implant surfaces without sharp edges.
• The method ensures accurate implant placement by following defect boundary contours.
• Evaluation shows a mean error of 89.29% for missing landmarks within 1 mm tolerance.

Conclusions:

• The developed CAD tool accurately generates patient-specific cranial implants.
• This approach offers a reliable solution for complex reconstructive cases.
• High accuracy in implant generation is demonstrated.