Finite Element Analysis of Reconstructed Sacro-iliac Joint with Galveston Technique after Subtotal Sacrum Resection
Abstract：Objective To evaluate the number of screws on the biomechanics of the sacral joint in the modified Galveston technology. Methods Based on the finite element postoperative pelvic model with subtotal sacrectomy previously established, two finite element models of modified Galveston technique were built,with 4 screws and 6 screws respectively. The same pres-sure load was applied on the two models,and the validity of the model was verified,the displacement of model and the stress distribution on screws and rods were compared. Results The model was validated to be effective according to the result of the experimental results of the cadaver model in the literature. Number of lumbar screws had little impact on the lumbosacral stiff-ness and equipment total stress. However,L5 pedicle screw stress of 4 screws reconstruction methods were higher than that of 6 screws reconstruction methods. Conclusion The less the number of screws,the greater stress on L5 pedicle screw. And the risk of screw breaking or loosening also increases with less screws. More pedicle screws should be used on osteoporosis pa-tients.
Keywords：subtotal sacrum resectionimproved Galveston technologysacro-iliac jointreconstructionbiomechanical effects
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 894-896,906 )