title: Patients With Isolated PCL Injuries Improve From Surgery as Much as Patients With ACL Injuries After 2 Years.
abstract: BACKGROUND
  Reports on outcome after posterior cruciate ligament (PCL) reconstruction often contain both isolated PCL and combined knee ligament injuries. This makes it difficult to conclude on the outcome after reconstruction of isolated PCL injuries.
  
  
  OBJECTIVE
  To investigate the outcome after PCL reconstruction in patients with an isolated PCL injury and to compare this with the outcome of patients treated with reconstruction after isolated anterior cruciate ligament (ACL) injuries.
  
  
  METHODS
  Cohort study; Level of evidence, 3.
  
  
  METHODS
  Seventy-one patients with an isolated PCL injury that was reconstructed surgically and who had registered in the Norwegian Knee Ligament Registry between 2004 and 2010 were included in this study. Patients with isolated ACL reconstructions (n = 9661) who had registered in the same period were included for comparison. Knee Injury and Osteoarthritis Outcome Score (KOOS) was used as the patient-reported outcome measure. Preoperative and 2-year postoperative KOOS scores were compared. Changes in KOOS score reported by the PCL patients were compared with changes reported by the ACL patients.
  
  
  RESULTS
  At the 2-year postoperative follow-up of the PCL-reconstructed patients, the patient-reported outcome was improved, measured by KOOS as follows: pain, 15.1 (95% CI, 8.5-21.8; P < .001); symptoms, 0.9 (95% CI, -6.6 to 8.3; P = .82); activities of daily living, 13.2 (95% CI, 6.6-13.9; P < .001); sports, 20.7 (95% CI, 11.8-29.4; P < .001); and quality of life, 26.6 (95% CI, 18.9-34.2; P < .001). According to the KOOS, the incremental improvements were similar for PCL and ACL patients. Time from injury to surgery was longer for the PCL patients compared with ACL patients (median, 21.5 vs 8.0 months; P < .001).
  
  
  CONCLUSIONS
  Patients undergoing PCL reconstruction can expect the same improvements in KOOS score as patients undergoing ACL reconstruction. However, PCL patients start out with an inferior score on average and consequently end up at a lower score compared with ACL patients for all KOOS subscales.
authors.affiliation: Department of Orthopaedic Surgery, Akershus University Hospital, Lørenskog, Norway.
authors.forename: Christian
authors.initials: C
authors.lastname: Owesen
authors.affiliation: Diakonhjemmet Hospital, Oslo, Norway.
authors.forename: Einar Andreas
authors.initials: EA
authors.lastname: Sivertsen
authors.affiliation: Department of Orthopaedics, Oslo University Hospital, Oslo, Norway. ; Faculty of Medicine, University of Oslo, Oslo, Norway. ; Oslo Sports Trauma Research Center, Oslo, Norway.
authors.forename: Lars
authors.initials: L
authors.lastname: Engebretsen
authors.affiliation: Department of Physical Medicine and Rehabilitation, Oslo University Hospital, Oslo, Norway. ; Oslo Sports Trauma Research Center, Norwegian School of Sport Sciences, Oslo, Norway. ; Norwegian Knee Ligament Registry, Bergen, Norway.
authors.forename: Lars-Petter
authors.initials: LP
authors.lastname: Granan
authors.affiliation: Department of Orthopaedic Surgery, Akershus University Hospital, Lørenskog, Norway.
authors.forename: Asbjørn
authors.initials: A
authors.lastname: Årøen
keywords: ACL; PCL; knee; register study; single-bundle surgery