Comparison of mechanical properties of interbody fusion cage with three general structures

Abstract

Abstract Lumbar interbody fusion cage has been widely used in the treatment of various clinical lumbar diseases, and the mechanical properties of the lumbar interbody fusion apparatus are very important to the initial stability after implantation. According to the development trend of interbody fusion cages, this work designed three bullet-type interbody fusion cages, which are window-type, windowless and fenestrated type. Three groups of experimental samples were formed by using TC4 titanium alloy material and an SLM forming process (laser power 170 W, scanning speed 1150 mm/s). After post-processing, the mechanical properties of the three different structures were compared and analyzed through static and dynamic fatigue experiments. The tissue defects before and after the fatigue test were observed by CT. It was concluded that the fenestrated interbody fusion cage has better comprehensive mechanical properties and is relatively safer.