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The device was returned for evaluation.Initial observation shows the implant is disassembled.This disassembly likely occurred as a result of over-collapsing the implant when retrieving the implant during the revision surgery, as there is no torque-limiting protection for collapsing the implant.The imaging provided shows the l5-s1 sable implant sitting posterior, partially outside the vertebral body.An immediate post-operative image shows the implant in position and expanded.It is hard to tell if any expansion height was lost in the post-migration imaging, as artifacts are obscuring the implant.Possible contributing factors to the failure include improper placement, improper implant sizing, or improper implant height; however, an exact cause to the reported issue could not be determined.
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