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Corrective force analysis for scoliosis from implant rod deformation
| Title: | Corrective force analysis for scoliosis from implant rod deformation |
| Authors: | Salmingo, Remel Browse this author | | Tadano, Shigeru Browse this author →KAKEN DB | | Fujisaki, Kazuhiro Browse this author | | Abe, Yuichiro Browse this author | | Ito, Manabu Browse this author |
| Keywords: | Biomechanics | | Scoliosis | | Rod deformation | | Finite element analysis |
| Issue Date: | Jul-2012 |
| Publisher: | Elsevier |
| Journal Title: | Clinical Biomechanics |
| Volume: | 27 |
| Issue: | 6 |
| Start Page: | 545 |
| End Page: | 550 |
| Publisher DOI: | 10.1016/j.clinbiomech.2012.01.004 |
| PMID: | 22321374 |
| Abstract: | Background: Scoliosis is a serious disease in which a human spine is abnormally deformed in three dimensions with vertebral rotation. Surgical treatment is attained when the scoliotic spine is corrected into its normal shape by implant rods and screws fixed into the vertebrae. The three-dimensional corrective forces acting at the screws deformed the implant rod during the surgical treatment of scoliosis. The objective of this study was to propose a method to analyze the three-dimensional forces acting at the rod using the changes of implant rod geometry before and after the surgical treatment. Methods: An inverse method based on Finite Element Analysis is proposed. The geometries of implant rod before and after the surgical treatment were measured three dimensionally. The implant rod before the surgical treatment was reconstructed using an elasto-plastic finite element model. The three-dimensional forces were applied iteratively to the rod through the screws such that the rod is deformed the same after the surgical treatment of scoliosis. Findings: The maximum force acting at the screw of each patient ranged from 198 N to 439 N. The magnitude of forces was clinically acceptable. The maximum forces occurred at the lowest fixation level of vertebra of each patient. Interpretation: The three-dimensional forces distribution that deformed the rod can be evaluated using the changes of implant geometry. Although the current clinical cases are still few, this study demonstrated the feasibility of measuring the forces that deformed the implant rod after the surgical treatment of scoliosis. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/49633 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 但野 茂
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