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Related Experiment Video

Updated: Jun 12, 2026

Video Movement Analysis Using Smartphones (ViMAS): A Pilot Study
07:51

Video Movement Analysis Using Smartphones (ViMAS): A Pilot Study

Published on: March 14, 2017

Coronal plane knee laxity measurement: Is computer-assisted navigation useful?

J-Y Jenny1

  • 1Hand reconstruction surgical center, Strasbourg University Teaching Hospitals, Strasbourg, France. jean-yves.jenny@chru-strasbourg.fr

Orthopaedics & Traumatology, Surgery & Research : OTSR
|June 22, 2010
PubMed
Summary

This study measured knee laxity during total knee replacement using a navigation system. Results suggest target ligamentous balance values for optimal surgical outcomes.

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Area of Science:

  • Orthopedic Surgery
  • Biomechanics
  • Medical Device Technology

Background:

  • Assessing physiological knee laxity in the coronal plane is crucial for total knee replacement (TKR).
  • Existing measurement devices yield varying results, necessitating validation of new systems.
  • Navigation systems offer potential for intraoperative measurement during TKR.

Purpose of the Study:

  • To measure physiological knee laxity in the coronal plane at 0 and 90° of flexion using a novel navigation system.
  • To compare laxity measurements obtained with the navigation system to previously published data.
  • To establish target ligamentous balance parameters for TKR.

Main Methods:

  • A prospective observational study involving 20 patients undergoing TKR for isolated anterior cruciate ligament injury.

Related Experiment Videos

Last Updated: Jun 12, 2026

Video Movement Analysis Using Smartphones (ViMAS): A Pilot Study
07:51

Video Movement Analysis Using Smartphones (ViMAS): A Pilot Study

Published on: March 14, 2017

  • Medial and lateral knee laxities were measured at 0° and 90° of flexion using a navigation system.
  • Data were collected during the cruciate ligament replacement phase of the surgery.

    • Main Results:

    • Mean extension laxity: medial 3.6±1.2°, lateral 4.1±1.9°. No significant asymmetry.
    • Mean 90° flexion laxity: medial 2.1±1.2°, lateral 3.7±1.2°. Significant asymmetry observed.
    • Medial laxities in extension and flexion were asymmetric; lateral laxities were not.

    Conclusions:

    • The navigation system provides measurable data on knee laxity during TKR.
    • Suggested tolerable ligamentous balance: ~3° for extension (medial/lateral), ~2° for medial 90° flexion, and ~4° for lateral 90° flexion.
    • These findings contribute to optimizing ligamentous balancing in total knee arthroplasty.