Instrumented measurements of knee laxity: KT-1000 versus navigation

  • Edoardo MonacoEmail author
  • Luca Labianca
  • Barbara Maestri
  • Angelo De Carli
  • Fabio Conteduca
  • Andrea Ferretti


The KT-1000 is widely accepted as a tool for the instrumented measurement of the antero-posterior (AP) tibial translation. The aim of this study is to compare the data obtained with the KT-1000 in ACL deficient knees with the data obtained using a navigation system during “in vivo” ACL reconstruction procedures and to validate the accuracy of the KT-1000. An ACL reconstruction was performed using computer aided surgical navigation (Orthopilot, B-Braun, Aesculap, Tuttlingen, Germany) in 30 patients. AP laxity measurements were obtained for all patients using KT-1000 arthrometer (in a conscious state and under general anaesthesia) and during surgery using the navigation system, always at 30° of knee flexion. The mean AP translation was 14 ± 4 and 15.6 ± 3.8 mm using the KT-1000 in conscious and under general anaesthesia, respectively (P = 0.02) and 16.1 ± 3.7 mm using navigation. Measurements obtained with the KT-1000 under general anaesthesia were no different from those obtained “in vivo” with the navigation system (P = 0.37). In conclusion this study validates the accuracy of the KT-1000 to exactly calculate AP translation of the tibia, in comparison with the more accurate measurements obtained using a navigation system.


ACL reconstruction KT-1000 arthrometer Navigation Knee stability 


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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Edoardo Monaco
    • 1
    • 2
    Email author
  • Luca Labianca
    • 1
    • 3
  • Barbara Maestri
    • 1
    • 4
  • Angelo De Carli
    • 1
    • 5
  • Fabio Conteduca
    • 1
    • 6
  • Andrea Ferretti
    • 1
    • 7
  1. 1.Orthopaedic Unit and Kirk Kilgour Sports Injury Center, II School of Medicine, Sant’Andrea Hospital“Sapienza” University of RomeRomeItaly
  2. 2.RomeItaly
  3. 3.TarantoItaly
  4. 4.RomeItaly
  5. 5.RomeItaly
  6. 6.RomeItaly
  7. 7.RomeItaly

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