title: No difference in revision rates between single- and double-bundle anterior cruciate ligament reconstruction: a comparative study of 16,791 patients from the Swedish national knee ligament register.
abstract: OBJECTIVE
  The purpose was to compare revision rates and patient-reported outcomes between single- and double-bundle anterior cruciate ligament (ACL) reconstructions.
  
  
  METHODS
  All patients from the Swedish National Knee Ligament Register from 2005 through 2011 who underwent primary ACL reconstruction with hamstring autografts were included. Patients with concomitant injuries, except meniscal and chondral injuries, were excluded. By December 31, 2011, 16,791 primary isolated ACL reconstructions had been registered, of which 16,281 were single-bundle and 510 were double-bundle. Cumulative revision rates were estimated using Kaplan-Meier analysis. The Knee injury and Osteoarthritis Outcome Score (KOOS) and EQ-5D were calculated at 1- and 2-year follow-ups.
  
  
  RESULTS
  The revision rate showed no statistically significant differences between the groups (P = .30). Over the 7-year observation period, 347 single-bundle (2.1%) and 8 double-bundle (1.6%) ACL reconstructions were revised. No significant differences in the KOOS or EQ-5D were found between the groups postoperatively. In addition, there were no differences in postoperative improvements in the KOOS or EQ-5D at 1- and 2-year follow-ups.
  
  
  CONCLUSIONS
  Revision rates after single- and double-bundle ACL reconstructions were low. No differences were found in revision rates, KOOS, and EQ-5D between the 2 techniques.
  
  
  METHODS
  Level III, retrospective comparative study.
authors.affiliation: Department of Orthopaedics, Sahlgrenska University Hospital, Mölndal, Sweden; Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden. Electronic address: haukurbj@hotmail.com.
authors.forename: Haukur
authors.initials: H
authors.lastname: Björnsson
authors.affiliation: Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden; Vårdcentralen Gripen, Karlstad, Sweden; Primary Care Research Unit, Centre for Clinical Research, County Council of Värmland, Karlstad, Sweden.
authors.forename: Daniel
authors.initials: D
authors.lastname: Andernord
authors.affiliation: Department of Orthopaedics, Sahlgrenska University Hospital, Mölndal, Sweden; Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden.
authors.forename: Neel
authors.initials: N
authors.lastname: Desai
authors.affiliation: Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden.
authors.forename: Olof
authors.initials: O
authors.lastname: Norrby
authors.affiliation: Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden; Stockholm Sports Trauma Research Center, Capio Artro Clinic, Stockholm, Sweden.
authors.forename: Magnus
authors.initials: M
authors.lastname: Forssblad
authors.affiliation: Akademistatistik-Centre for Applied Biostatistics, Occupational and Environmental Medicine, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden.
authors.forename: Max
authors.initials: M
authors.lastname: Petzold
authors.affiliation: Department of Orthopaedics, Sahlgrenska University Hospital, Mölndal, Sweden; Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden.
authors.forename: Jón
authors.initials: J
authors.lastname: Karlsson
authors.affiliation: Department of Orthopaedics, Sahlgrenska University Hospital, Mölndal, Sweden; Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden.
authors.forename: Kristian
authors.initials: K
authors.lastname: Samuelsson
mesh_terms: D000328:Adult; D000070598:Anterior Cruciate Ligament Injuries; D059549:Anterior Cruciate Ligament Reconstruction / Q000009:adverse effects / Q000379:methods* / Q000534:rehabilitation; D005260:Female; D006801:Humans; D053208:Kaplan-Meier Estimate; D007718:Knee Injuries / Q000453:epidemiology / Q000601:surgery*; D007719:Knee Joint / Q000601:surgery; D008023:Ligaments, Articular / Q000601:surgery; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000601:surgery; D020370:Osteoarthritis, Knee / Q000453:epidemiology / Q000209:etiology; D011788:Quality of Life; D012042:Registries; D012086:Reoperation / Q000379:methods / Q000706:statistics & numerical data; D012189:Retrospective Studies; D013548:Sweden / Q000453:epidemiology; D016896:Treatment Outcome; D055815:Young Adult