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30 May 2014 : Research paper

Finite element analysis of lumbosacral reconstruction after partial sacrectomy

Longpo ZhengBCD, Ziqiang LiBD, Quan LiA, Fang JiDE, Zhengdong CaiA

DOI: 10.12659/MSM.890134

Med Sci Monit 2014; 20:889-893

Abstract

BACKGROUND: The biomechanical property of MGT for patients who underwent partial sacrectomy is not well documented, so this study aimed to investigate biomechanical property of lumbosacral reconstruction after partial sacrectomy.

MATERIAL AND METHODS: Three 3-dimensional finite element models of lumbosacral region were established: 1) an intact model (INT), 2) a defective model in which partial sacrectomy was performed cephalad to S1 foramina (DEF), and 3) a reconstructed model (REC).

RESULTS: Displacements of anchor point on L3 vertebrae in INT, DEF, and REC model were 6.63 mm, 10.62 mm, 4.29 mm (titanium), and 3.86mm (stainless steel), respectively. Stress distribution of the instrument in REC model showed excessive concentration on the caudal spinal rod, which may cause rod failure between spine and ilia. Maximum von Mise stress of the stainless steel instrument was higher than titanium instruments, and values of stress of the anchor point around the sacroiliac joint in the REC model were 26.4 MPa with titanium instruments and 23.9MPa with stainless steel instruments.

CONCLUSIONS: Lumbosacral reconstruction can significantly increase stiffness of the spinopelvis of patients who underwent partial sacrectomy. However, the rod between L5 and ilia is the weakest region of all instruments. Stainless steel instruments have higher risk of rod failure and are less suitable for lumboiliac arthrodesis than titanium instruments.

Keywords: Finite Element Analysis, Biomechanical Phenomena, Models, Biological, Reconstructive Surgical Procedures, Sacrum - surgery, Stress, Mechanical

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750