Haemophilus Parainfluenzae Septic Arthritis Following Primary All-Inside Meniscus Repair: A Case Report and Review of the Literature.

Background: Haemophilus parainfluenzae (H. parainfluenzae) is a gram-negative rod that inhabits the oral cavity. It is a common cause of respiratory tract infections and rarely is responsible for musculoskeletal infections in immunocompetent hosts. We present a case of a 17-year-old male whose postoperative course following arthroscopic all-inside meniscus repair was complicated with H. parainfluenzae septic arthritis. The infection was successfully cleared with two arthroscopic irrigation and debridements and antibiotic therapy. The patient successfully returned to full-contact high school football at five months postoperatively. To our knowledge, this represents the first reported case of H. parainfluenzae infection following an orthopaedic procedure in an adolescent. Level of Evidence: IV.