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Instrumented measurements of knee laxity: KT-1000 versus navigation

  • Knee
  • Published:
Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

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.

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Authors and Affiliations

  1. Orthopaedic Unit and Kirk Kilgour Sports Injury Center, II School of Medicine, Sant’Andrea Hospital, “Sapienza” University of Rome, Rome, Italy

    Edoardo Monaco, Luca Labianca, Barbara Maestri, Angelo De Carli, Fabio Conteduca & Andrea Ferretti

  2. Via D. Di Buoninsegna 22, 00142, Rome, Italy

    Edoardo Monaco

  3. Via Gambero 5, Taranto, Italy

    Luca Labianca

  4. Via Arturo Graf 33, 00137, Rome, Italy

    Barbara Maestri

  5. Via di Val Cannuta, 00100, Rome, Italy

    Angelo De Carli

  6. Via Flaminia, 00100, Rome, Italy

    Fabio Conteduca

  7. Via Lidia 73, 00179, Rome, Italy

    Andrea Ferretti

Authors
  1. Edoardo Monaco
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  2. Luca Labianca
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  3. Barbara Maestri
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  4. Angelo De Carli
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  5. Fabio Conteduca
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  6. Andrea Ferretti
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Correspondence to Edoardo Monaco.

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Monaco, E., Labianca, L., Maestri, B. et al. Instrumented measurements of knee laxity: KT-1000 versus navigation. Knee Surg Sports Traumatol Arthrosc 17, 617–621 (2009). https://doi.org/10.1007/s00167-009-0724-1

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  • DOI: https://doi.org/10.1007/s00167-009-0724-1

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