title: Anterior Cruciate Ligament Reconstruction and Osteoarthritis: Evidence from Long-Term Follow-Up and Potential Solutions.
abstract: OBJECTIVE
  The goals of this study are to address several questions, the answers to which are key to the understanding and eventually to the prevention of this frequent source of morbidity. These questions include the following: (1) What is the natural history of anterior cruciate ligament (ACL) deficiency? (2) How important is the status of the meniscus at the time of reconstruction? (3) Does ACL reconstruction prevent the development of osteoarthritis in the long term? (4) Can we predict which patients will develop osteoarthritis? (5) What can be done?
  
  
  METHODS
  This study addresses the key questions above through the long-term follow-up of a cohort of patients treated with ACL reconstruction by Professor Henri Dejour in Lyon, France, supplemented with a review of the relevant literature.
  
  
  RESULTS
  The prevalence of osteoarthritis in ACL-deficient knees is about 40% after 15 years and close to 90% after 25 to 35 years. It remains unclear whether reconstruction of the ACL significantly reduces this risk. The status of the meniscus at the time of ACL reconstruction is a strong predictor of the risk of osteoarthritis: Patients who undergo total meniscectomy are at 2- to 10-fold increased risk of developing osteoarthritis relative to those with intact menisci. Patients showing early evidence of arthritis at short- to medium-term follow-up are at high risk for progression over subsequent years. Numerous emerging techniques may provide tools to more effectively prevent and treat osteoarthritis following ACL injury in the future.
  
  
  CONCLUSIONS
  Osteoarthritis following ACL injury continues to be a major problem requiring further research.
authors.affiliation: Department of Orthopaedics, Sports Health and Performance Institute, The Ohio State University Medical Center, Columbus, OH, USA.
authors.forename: Robert A
authors.initials: RA
authors.lastname: Magnussen
authors.affiliation: Department of Orthopaedic Surgery, Hôpital de la Croix-Rousse, Centre Albert Trillat, Lyon, France.
authors.forename: Victoria
authors.initials: V
authors.lastname: Duthon
authors.affiliation: Department of Orthopaedic Surgery, Hôpital de la Croix-Rousse, Centre Albert Trillat, Lyon, France.
authors.forename: Elvire
authors.initials: E
authors.lastname: Servien
authors.affiliation: Department of Orthopaedic Surgery, Hôpital de la Croix-Rousse, Centre Albert Trillat, Lyon, France.
authors.forename: Philippe
authors.initials: P
authors.lastname: Neyret
keywords: anterior cruciate ligament; osteoarthritis; reconstruction