Patient underwent revision surgery on (b)(6) 2021, for unspecified reasons at which time it was noted that 1 of 6 lock screws had backed out.The root cause of this event cannot be determined at this time as no implants or x-rays were made available for analysis.The reason for the revision surgery is unknown at this time, and no additional information was provided.Review of labeling: possible adverse events: loosening of spinal fixation implants may occur due to, latent infection, and/or premature loading, possibly resulting in bone erosion, migration or pain.
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