title: Instrumented measurements of knee laxity: KT-1000 versus navigation.
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 degrees 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.
authors.affiliation: Orthopaedic Unit and Kirk Kilgour Sports Injury Center, II School of Medicine, Sant'Andrea Hospital, Sapienza University of Rome, Rome, Italy. edoardo.monaco@tin.it
authors.forename: Edoardo
authors.initials: E
authors.lastname: Monaco
authors.forename: Luca
authors.initials: L
authors.lastname: Labianca
authors.forename: Barbara
authors.initials: B
authors.lastname: Maestri
authors.forename: Angelo
authors.initials: A
authors.lastname: De Carli
authors.forename: Fabio
authors.initials: F
authors.lastname: Conteduca
authors.forename: Andrea
authors.initials: A
authors.lastname: Ferretti
mesh_terms: D000328:Adult; D053587:Arthrometry, Articular / Q000295:instrumentation / Q000379:methods; D006801:Humans; D007593:Joint Instability / Q000175:diagnosis*; D007718:Knee Injuries / Q000473:pathology; D007719:Knee Joint / Q000473:pathology*; D008297:Male; D025321:Surgery, Computer-Assisted; D055815:Young Adult