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Evaluation of the returned devices showed the screw heads to display extreme amounts of wear on exterior surfaces.The location of the damage observed indicates that the wear is very likely the result of the implant removal.The wear patterns on the rods show evidence of sliding; however, it cannot be determined if this occurred while implanted or during removal.The locking caps show areas of stripped anodizing, and the wear pattern on the bottom surface is inconsistent.The ring pattern around the outer diameter may indicate tightening of the locking cap while the screw head is not normalized to the rod.The exact cause of the reported issue could not be determined.
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