Simulation and Validation of Spinal Construct Testing based on ASTM F1717

Byeong Cheol JeongOn SimChiseung Lee^*

• Pusan National University, Busan, Republic of Korea

Spinal implant systems must demonstrate reliable mechanical performance and safety prior to clinical application, necessitating standardized evaluation methods. The ASTM F1717 standard offers a widely accepted framework for assessing the static mechanical properties of spinal fixation constructs using a vertebrectomy model, facilitating objective comparisons across different implant designs and configurations. Building on this framework, the present study conducted both experimental tests and finite element analysis (FEA) to evaluate mechanical behavior and validate simulation-based design approaches for spinal implants. The test construct comprised pedicle screws, spinal rods, and UHMWPE blocks, assembled and subjected to static compression and tension using a universal testing machine. Four screw configurations, varying in diameter and length, were evaluated to examine their effects on fixation strength and rod deformation. The results indicated that screw diameter had a pronounced effect on reaction force, whereas screw length had a comparatively minor influence. Furthermore, increased construct stiffness was associated with decreased yield displacement of the spinal rod. These findings suggest that the proposed screw designs may enhance structural durability and surgical safety in clinical applications. Moreover, the study supports the use of validated FEA as a reliable alternative to physical testing during the early stages of implant design.