In total en bloc spondylectomy, a tumorous vertebra is totally removed and replaced by a titanium mesh cage filled bone graft, and spinal instrumentation is carried out by using pedicle screw system. Two types of reconstruction method are available. One is the multilevel posterior instrumentation (MLP), and another is the short posterior and anterior instrumentation (SPA). MLP has posterior fixations using pedicle screws system at four or more vertebrae. SPA has anterior and posterior fixations in left side at two vertebrae. It is considered that bone fusion and remodeling of the grafting depend on mechanical stress condition. Although mechanical stress condition has not been sufficiently investigated. In this study, analysis of the reconstructed structure were carried out and stress condition around the titianium mesh cage was discussed.
