title: Medium to long-term follow-up after ACL revision.
abstract: OBJECTIVE
  The aim of the present study is to present epidemiology and clinical outcome after revision anterior cruciate ligament (ACL) reconstruction with an intermediate follow-up time of up to 9 years.
  
  
  METHODS
  A retrospective study of patients treated with ACL revision from 2001 to 2007 at a university referral clinic was conducted. Study follow-up was performed in 2010; this follow-up included objective IKDC scores, KOOS, Tegner and SANE subjective scores, KT-1000 knee laxity measurements and registration of reoperations and complications.
  
  
  RESULTS
  One hundred and twenty-eight patients were available for follow-up. Median follow-up time was 6 (2-9) years. Mean age was 32 years, 50% were men. Eleven percent required staged procedures, 30% were reconstructed with allograft tendons and 23% had collateral ligament reconstruction in combination with the ACL revision. SANE knee global score (0-100) was 74 at follow-up, KOOS sub-scores were preoperatively 66, 69, 77, 42 and 39 for pain, symptoms, activity of daily living, sports and quality of life, respectively. At follow-up, scores were 70, 76, 81, 50 and 50, respectively. Sport and quality of life scores increased significantly. KT-1000 was 6.2 mm preoperatively and 2.5 at follow-up (P < 0.05). Six percent were re-revised and 2 patients had total knee replacements.
  
  
  CONCLUSIONS
  Despite objective findings of acceptable sagittal knee stability at follow-up, subjective outcome scores indicate significant knee impairment with low scores in sport and quality of life. A re-revision rate of 6% after 6 years is acceptable. It is imperative that patients eligible for ACL revision receive proper counseling in terms of outcome expectancies.
  
  
  METHODS
  Retrospective case series, Level IV.
authors.affiliation: Division of Sports Trauma, Orthopedic Department, Aarhus University Hospital, Tage Hansensgade 2, 8000, Aarhus C, Denmark. Martinlind@dadlnet.dk
authors.forename: Martin
authors.initials: M
authors.lastname: Lind
authors.forename: Bent
authors.initials: B
authors.lastname: Lund
authors.forename: Peter
authors.initials: P
authors.lastname: Faunø
authors.forename: Sinan
authors.initials: S
authors.lastname: Said
authors.forename: Lene Lindberg
authors.initials: LL
authors.lastname: Miller
authors.forename: Svend Erik
authors.initials: SE
authors.lastname: Christiansen
mesh_terms: D000293:Adolescent; D000328:Adult; D016118:Anterior Cruciate Ligament / Q000601:surgery; D000070598:Anterior Cruciate Ligament Injuries; D059549:Anterior Cruciate Ligament Reconstruction / Q000534:rehabilitation; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007593:Joint Instability / Q000209:etiology; D007718:Knee Injuries / Q000150:complications / Q000534:rehabilitation / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement; D017060:Patient Satisfaction / Q000706:statistics & numerical data; D011183:Postoperative Complications / Q000453:epidemiology; D011788:Quality of Life; D020127:Recovery of Function; D012086:Reoperation / Q000706:statistics & numerical data; D012189:Retrospective Studies; D016896:Treatment Outcome; D055815:Young Adult