Patient underwent an arthroscopic left knee anterior cruciate ligament (acl) reconstruction using bone-patellar tendon-bone allograft.The patient experienced a typical post-op course until sharp knee pain led to an emergency department visit 11 months post-surgery.X-rays revealed a 1 inch linear metallic object within bone with - inch extending out into tissue.Surgery for retrieval of the object was required and performed without difficulty.The object was a retained fragment of a metal rigidfix cannula which had been used with the cross pin system at the time of the original surgery.
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