It was reported that patient underwent a revision surgery because the shim component had migrated posteriorly.During the revision surgery the surgeon removed the shim, but the shell component was not removed.Since the shell was stable and intervertebral height was being maintained, the surgeon left the shell in the disc space and filled it with additional graft.This shim was returned to the manufacturer and no defects were observed.Post-operative imaging from the original procedure indicated that the shim component was not locked into the shell component as indicated in the surgical technique.
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