Mobi-c p&f us : disassembly surgeon executed a 2 level mobi-c.After successfully implanting lower level, surgeon implanting proximal level.Upon impaction, device loosened from peek cartridge & was replaced with implant from the same size.Loosen device discarded.No harm to patient.The review of the device history records and traceability did not reveal any non-conformances to specifications or deviations in procedures that might have contributed to the reported event.From additional information received, surgeon encountered resistance while inserting prosthesis and may have inserted it with a slight angle.Surgeon tried to reorient the trajectory.From this description, probable cause identified during complaint meeting of (b)(6) 2017 is user error.
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