A study of design and digital simulation of a anterior internal fixation system

Abstract

At present, anterior cervical discectomy and fusion often use internal fixation system to assist fixation of surgical segments, and the design of internal fixation system profile has an important influence on postoperative complications such as vertebral injury. In this study, a triangular anterior internal fixation system was designed to reduce the risk of postoperative complications. In this study, a intact C1-C7 segment finite element model was established and verified. Based on this model, a quadrilateral fixation system (QFS) and a triangle fixation system (TFS) implanted model were established. The stress distribution and peak value of the screw holes were compared during the postoperative flexion, lateral bending, rotation and extension motion patterns. Compared with the QFS, the stress ratio of the bone-screw interface of TFS is 40% smaller on average. After TFS implantation, in addition, because of the TFS screw hole beard less stress, it has certain advantages of screw loosening and reducing the risk of vertebra damage at the screw hole.