... ranges and replicated normal stress/strain dynamics. No mechanical or functional failures occurred within the loads and ROM experienced by the human disc. Fatigue testing of the worst case VTDR device size demonstrated a fatigue life of 50 years of simulated walking and 240 years of simulated significant...

...David Spenciner, Sc.M.; Jared W. Walkenhorst; Dennis Y. Lee; David Paller We are presenting a novel, non-biologic model of the healthy human annulus. This lumbar Total Disc Model (TDM) ideally would be both biofidelic and sufficiently robust to withstand long-term fatigue testing without breaking...

... of manufacturing as well as operation, that can perform the fatigue testing accurately, and automatically without compromise in safety. Many different design configurations have been considered for the testing machine. In the end, the best compromise between accuracy, cost, and complexity proved to be the motor...