Disc Measurement and nucleus calibration increases the accur
During a spinal biomechanical research, finite element analysis (FEA) is a useful method. Irregular surfaces in FEA models reconstructed directly from imaging data may increase computing burden and lower computational confidence. In FE-A, the relative nucleus position and its cross-sectional area ratio are not defined in a consistent manner.

To increase the accuracy and efficiency of FEA, nucleus position and cross-sectional area ratio were measured from imaging data. Nucleus position was calibrated by estimating the differences in the range of motion (RoM) between the FEA model and that of an in-vitro study. Then, the differences were re-estimated by comparing the RoM, the intradiscal pressure, the facet contact force, and the disc compression to validate the measured and calibrated indicators.

Results:
--Computational results indicated that 99% of accuracy was attained when measured and calibrated indicators were set in the FEA model, with a model validation of greater than 90% attained under almost all of the loading conditions.

--Computational time decreased by around 70% in the fitted model with smoothened surfaces compared with that of the reconstructed model.

Finally, in the lumbar FEA model developed utilizing smoothened surfaces with measured and calibrated relative nucleus position and cross-sectional area ratio, the computational accuracy and efficiency of in-silico analysis may be enhanced.

Source: https://josr-online.biomedcentral.com/articles/10.1186/s13018-021-02655-4
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