Pre-surgical CT/FEA for craniofacial distraction: I. Methodology, development, and validation of the cranial finite element model.
Recently, surgeons have begun to treat serious congenital craniofacial deformities including craniosynostoses with mechanical devices that gradually distract the skull. As a prospective means of treatment planning for such complex deformities, FE models derived from routine preoperative CT scans (CT/FEA) would provide ideal patient specific engineering analyses. The purpose of this study was to assess the dimensional and predictive accuracy of the CT/FEA process through the development of a 3D model of a dry human calvarium subjected to two-point distraction ex vivo. Comparative skull measurements revealed that CT/FEA construction error did not exceed 1% for transcranial dimensions, and the thickness error did not exceed 8.66% or 0.31 mm. CT/FEA strain predictions for the central region of the skull, between the distraction posts, were not statistically different from homologous gage values at P < 0.05. Peripherally, however, the strain fields were less well behaved and the FE predictions showed only general qualitative agreement with gage recordings.
Remmler
D
D
Department of Mechanical Engineering, University of Nebraska, Lincoln, 68588, USA.
Olson
L
L
Ekstrom
R
R
Duke
D
D
Matamoros
A
A
Matthews
D
D
Ullrich
C G
CG
D001696:Biomechanical Phenomena; D003198:Computer Simulation; D019465:Craniofacial Abnormalities / Q000000981:diagnostic imaging / Q000601:surgery; D006801:Humans; D019857:Osteogenesis, Distraction; D012886:Skull / Q000000981:diagnostic imaging / Q000601:surgery*; D014057:Tomography, X-Ray Computed