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Related Concept Videos

Knee Joint01:23

Knee Joint

The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris group...

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Related Experiment Video

Updated: May 8, 2026

Using a Knee Arthrometer to Evaluate Tissue-specific Contributions to Knee Flexion Contracture in the Rat
04:59

Using a Knee Arthrometer to Evaluate Tissue-specific Contributions to Knee Flexion Contracture in the Rat

Published on: November 9, 2018

Bench testing of a knee joint arthrometer.

Massimo G Barcellona, Tony Christopher, Matthew C Morrissey

    Orthopedics
    |August 14, 2013
    PubMed
    Summary

    KT1000 and KT2000 knee arthrometers overestimate anterior laxity and underestimate posterior laxity. Correction factors are provided to improve the accuracy of these common knee laxity measurement devices.

    Area of Science:

    • Orthopedics
    • Biomechanics
    • Medical Device Evaluation

    Background:

    • KT1000 and KT2000 knee joint arthrometers are widely used to measure knee laxity.
    • Previous studies suggest these devices may overestimate sagittal laxity measurements.

    Purpose of the Study:

    • To investigate the accuracy of KT1000 and KT2000 knee arthrometers in measuring anterior and posterior linear displacement.
    • To determine systematic errors and develop correction factors for these devices.

    Main Methods:

    • Compared displacement measurements from three KT arthrometers (2 KT1000, 1 KT2000) against a precision Vernier Dial Test Indicator.
    • Analyzed analog output from the KT2000 against its displacement dial readings.

    Main Results:

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    In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
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    In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty

    Published on: May 5, 2023

    Related Experiment Videos

    Last Updated: May 8, 2026

    Using a Knee Arthrometer to Evaluate Tissue-specific Contributions to Knee Flexion Contracture in the Rat
    04:59

    Using a Knee Arthrometer to Evaluate Tissue-specific Contributions to Knee Flexion Contracture in the Rat

    Published on: November 9, 2018

    In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
    07:33

    In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty

    Published on: May 5, 2023

    • KT arthrometers overestimated anterior displacement by 22-24%. True anterior displacement = KT value * 0.79.
    • KT arthrometers underestimated posterior displacement by 18-19%. True posterior displacement = KT1000 value * 1.17; KT2000 value * 1.16.
    • Identified predictable systematic errors in anterior and posterior displacement measurements.

    Conclusions:

    • KT1000 and KT2000 knee arthrometers exhibit systematic errors, overestimating anterior and underestimating posterior displacement.
    • Correction equations are proposed to enhance the accuracy of sagittal plane knee laxity measurements using these devices.
    • Future validation studies should incorporate these correction factors for precise knee laxity assessment.