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Postoperative septic arthritis with We present a case of postoperative septic arthritis with Eikenella corrodens and Streptococcus mitis following an arthroscopic anterior cruciate ligament reconstruction in an adolescent male with no pertinent medical history. The patient presented to the emergency department nine days after the operation with fever, an elevated white blood cell count, knee pain, and effusion. Arthrocentesis of the knee yielded purulent fluid that tested positive for S. mitis. Repeat intraoperative cultures revealed E. corrodens. In addition to antibiotics, the patient's treatment course included arthroscopic irrigation and debridement in the operating room as well as removal of graft material and fixation devices. To our knowledge, this is the first case of a polymicrobial infection of E. corrodens and S. mitis causing septic arthritis in a teenager following arthroscopic anterior cruciate ligament reconstruction.