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The screwdriver was returned to xtant for evaluation and the reported event was confirmed.Visual evaluation of the driver identified a fractured and missing distal tip, along with twisting of the remaining distal portion in the counter-clockwise direction, indicating excessive rotational force applied to the device during the attempted loosening of a set screw.Signs of wear were apparent including scratches and abrasions across the surface and minor discoloration and fading of the laser markings.Operative notes and/or medical records were not provided for review of usage/technique.It is unknown if a torque limiting handle or hand tightening was used when the malfunction occurred.A review of manufacturing records for the device was performed and no deviations were identified.The screwdriver released to the field in february 2012, resulting in an approximate field life of twelve (12) years.It is unknown how many uses the instrument had undergone after release to the field.No further investigation was able to be completed at this time.A definitive root cause was unable to be determined with the information provided; however, may have been related to excessive force applied to the instrument.As documented in the ifu for the fortex system "inspection and trial assembly are recommended prior to surgery to determine if instruments or implants have been damaged." additionally, the ifu warns "by the mechanism of fatigue, these stresses can cause eventual bending, loosening or breakage of the device(s)." if any further information is obtained that would change or alter any information provided, a supplemental report will be filed accordingly.
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