Seven lumbosacral (元-S1) human cadaver specimens were tested in a universal spine tester in the intact condition, the specimens instrumented with a two-piece ALIF cage (Statur ®-L, FBC Device, Denmark) and a one-piece ALIF cage (Pezo™-A, Ulrich GmbH & Co. The aim of the study is to compare the rigidity and bone–implant relative motion of segments treated with either a conventional one-piece ALIF cage versus a two-piece ALIF cage, which adapts in situ and permits 7°–21° of lordosis. Subsidence is a multifactorial complication, where implant design is one important element.
Clinical research has documented that cage subsidence and the loss of balance correction is a significant complication related to spinal fusion.
