All four components were returned for evaluation.Initial observation shows the medial tip of the altera inserter sleeve is slightly deformed outward and some wear is visible on the distal tip.This type of damage is seen when the user excessively tightens the gold knob on the altera inserter base.Additional information provided that the case was an l5-s1 tlif with disc prep and mis screws done with robotic navigation.The altera spacer was articulated without issue.When the surgeon attempted to medialize the implant, the implant and inserter assembly shifted through the anterior longitudinal ligament (all) of the l5-s1 disc space.It was reported there was an osteophyte near the disc space on the anterior portion of the l5 vertebra that may have caused or contributed to the all rupturing, which allowed the implant to contact the vein.It was also reported that the implant was not able to be collapsed to remove.This is likely due to pulling on the inserter, as this causes the spring in the threaded shaft to compress and disengage the driver shaft.After removing the implant, it was noted that there were pieces of a mesh stent inside the altera implant, and the patient started to bleed significantly.It is possible that the osteophyte could have compromised the integrity of the all allowing the event to occur; however, an exact cause to the reported issue could not be determined.
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