title: Bioabsorbable interference screw failure in anterior cruciate ligament reconstruction: A case series and review of the literature.
abstract: BACKGROUND
  To report a case series of failures of bioabsorbable interference screws with possible identification of a novel failure mechanism.
  
  
  METHODS
  A retrospective review of ACL reconstructions by the senior author utilizing BioComposite™ Interference Screws (Arthrex, Inc., Naples, FL) was performed. Complications related to screw placement, including fracture, breakage or bending were examined. Our rate and methods of failure were compared to those quoted in the current literature.
  
  
  RESULTS
  Eighty-seven patients of average age 23.8 years met inclusion criteria. There were eight screw failures in six patients, with femoral failure in seven and tibial failure in one. The femoral screw fractured halfway between the tip and head in five, while the head of the screw broke in one and the screw bent in another. In the case of tibial interference screw fracture, failure occurred halfway between the tip and head. The insertion device that was used was replaced after recognition of material deformation and considered a potential contributor to the breakage risk as no further screw failures have occurred since.
  
  
  CONCLUSIONS
  We demonstrate a unique failure mechanism of bio-absorbable interference screws. In each case, the reconstruction was salvaged. Regular inspection of materials and implants can ensure optimal outcomes and decrease complications intra-operatively.
authors: University of Illinois at Chicago Department of Orthopaedic Surgery, Chicago, IL, United States. Electronic address: jonwatsonmd@gmail.com.
authors: Jonathan N
authors: JN
authors: Watson
authors: University of Illinois at Chicago Department of Orthopaedic Surgery, Chicago, IL, United States. Electronic address: Peter.mcqueen@gmail.com.
authors: Peter
authors: P
authors: McQueen
authors: University of Illinois at Chicago Department of Orthopaedic Surgery, Chicago, IL, United States. Electronic address: Walter.jw.kim@gmail.com.
authors: Walter
authors: W
authors: Kim
authors: University of Illinois at Chicago Department of Orthopaedic Surgery, Chicago, IL, United States. Electronic address: mhutch@uic.edu.
authors: Mark R
authors: MR
authors: Hutchinson
mesh_terms: D020341:Absorbable Implants; D016118:Anterior Cruciate Ligament / Q000601:surgery*; D000070598:Anterior Cruciate Ligament Injuries; D059549:Anterior Cruciate Ligament Reconstruction / Q000379:methods*; D001863:Bone Screws; D004868:Equipment Failure; D005269:Femur / Q000601:surgery; D006801:Humans; D007718:Knee Injuries / Q000601:surgery*; D013710:Tendons / Q000601:surgery; D013977:Tibia / Q000601:surgery
keywords: ACL reconstruction failure; Anterior cruciate ligament (ACL) reconstruction; Aperture fixation; Bioabsorbable interference screw; Interference screw breakage