Reliability of a navigation system for intra-operative evaluation of antero-posterior knee joint laxity

Nicola Lopomo, Simone Bignozzi, Sandra Martelli, Stefano Zaffagnini, Francesco Iacono, Andrea Visani, Maurilio Marcacci

Research output: Contribution to journalArticlepeer-review


Background: The purpose of this study was to investigate about the reliability of measuring antero-posterior laxity within-subjects for in-vivo studies using a navigation system. Methods: The analysis was performed by enroling 60 patients undergoing anterior cruciate ligament ACL reconstruction, and assessing AP laxity during the Lachman and drawer tests. Results: For the navigation system standard deviation for intra-trial measures was 0.7 mm, thus the intra-trial repeatability coefficient was 2.2 mm; standard deviation for intra-trial measure was 1.2 mm, while the reference inter-trial repeatability coefficient between expert surgeons was 3.4 mm. Conclusions: In conclusion, this study suggests that KIN-Nav may represent a new method to measure and document AP laxity intra-operatively with improved accuracy and test the effect of surgical treatment in-vivo with higher sensitivity than in the past and this study quantify its reliability for within-subjects studies performed by a single expert surgeon.

Original languageEnglish
Pages (from-to)280-285
Number of pages6
JournalComputers in Biology and Medicine
Issue number3
Publication statusPublished - Mar 2009


  • ACL lesion
  • Arthrometer
  • KIN-Nav
  • Knee laxity
  • Navigation systems
  • Rolimeter

ASJC Scopus subject areas

  • Computer Science Applications
  • Health Informatics


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