title: The outcome after lateral tibial plateau fracture treated with percutaneus screw fixation show a tendency towards worse functional outcome compared with a reference population.
abstract: OBJECTIVE
  The objective of this study was to evaluate the functional and radiological outcome after lateral tibial plateau fractures (Müller AO classification (AO) 41-B1, B2 and B3) treated with minimal invasive bone tamp reduction and percutaneous screw fixation.
  
  
  METHODS
  Retrospective, cross-sectional study. Review and clinical examination of 37 patients treated between 2005 and 2010. The patients completed a clinical examination, Knee Injury and Osteoarthritis Outcome Score (KOOS) and questionnaire evaluating QOL (Eq5D-5L).
  
  
  RESULTS
  Thirty-seven patients agreed to participate (76 %). Mean time of follow-up was 5.2 years. At final follow-up, maintained anatomical joint reduction was achieved in 34 patients. The mean KOOS score was pain = 84.4, ADL = 88.4, symptoms = 80.7, QOL = 70.3, sport = 59.6. Compared with the established KOOS reference population patients, the current study reports a tendency towards worse KOOS scores but is only significant for KOOS sport. The mean Eq5D-5L index was 0.815 and shows a tendency towards worse outcome compared with the reference population. Mean knee flexion: 125.7° (95-135). A reduced number of sit-to-stands in the mean 30-s chair stand test showed a significant negative association with KOOS. The study showed a significant association between younger age at surgery and worse KOOS outcome.
  
  
  CONCLUSIONS
  At 5.2-year follow-up, the patients reported a tendency towards worse KOOS and Eq5D-5L scores compared with established reference populations. This study shows a significant association between a decrease in muscle strength and worse KOOS outcome. Furthermore, a significant association between younger age at the time of surgery and worse KOOS outcome score was observed.
authors.affiliation: Department of Orthopaedic Surgery, Aalborg University Hospital, Aalborg University, 18-22 Hobrovej, 9000, Aalborg, Denmark. rae@rn.dk.
authors.forename: R
authors.initials: R
authors.lastname: Elsoe
authors.affiliation: Department of Occupational Therapy and Physiotherapy, Aalborg University Hospital, Aalborg, Denmark.
authors.forename: P
authors.initials: P
authors.lastname: Larsen
authors.affiliation: Department of Radiology, Aalborg University Hospital, Aalborg, Denmark.
authors.forename: N
authors.initials: N
authors.lastname: Shekhrajka
authors.affiliation: Department of Orthopaedic Surgery, Aalborg University Hospital, Aalborg University, 18-22 Hobrovej, 9000, Aalborg, Denmark.
authors.forename: L
authors.initials: L
authors.lastname: Ferreira
authors.affiliation: Department of Orthopaedic Surgery, Aalborg University Hospital, Aalborg University, 18-22 Hobrovej, 9000, Aalborg, Denmark.|Department of Clinical Medicine, Aalborg University, Aalborg, Denmark.
authors.forename: S E
authors.initials: SE
authors.lastname: Ostgaard
authors.affiliation: Department of Orthopaedic Surgery, Aalborg University Hospital, Aalborg University, 18-22 Hobrovej, 9000, Aalborg, Denmark.|Orthopaedic Surgery Research Unit, Research and Innovation Center, Aalborg University Hospital, Aalborg, Denmark.|Department of Clinical Medicine, Aalborg University, Aalborg, Denmark.|Department of Clinical Medicine, Aarhus University, Aarhus, Denmark.
authors.forename: S
authors.initials: S
authors.lastname: Rasmussen
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D001863:Bone Screws; D003430:Cross-Sectional Studies; D003718:Denmark; D005260:Female; D005592:Fracture Fixation / Q000009:adverse effects / Q000295:instrumentation / Q000379:methods; D006801:Humans; D008297:Male; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures / Q000009:adverse effects / Q000295:instrumentation / Q000379:methods; D063868:Patient Outcome Assessment; D011788:Quality of Life; D011859:Radiography / Q000379:methods; D020127:Recovery of Function; D012307:Risk Factors; D013977:Tibia / Q000000981:diagnostic imaging / Q000293:injuries / Q000601:surgery; D013978:Tibial Fractures / Q000175:diagnosis / Q000503:physiopathology / Q000523:psychology / Q000601:surgery
keywords: Minimal invasive surgery; Outcome; Patient-reported outcome; Tibial plateau fracture