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Studies ACL: Anterior cruciate ligament
  • Anterior cruciate ligament (ACL) injury/tear
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  • Why buy a KT 1000 arthrometer when you can get a GNRB? Did I tear my ACL? TOP 5 ACL diagnostic tests KT-1000 / KT-2000 / GNRB comparison Sports related to ACL Injuries ACL fast facts Arthrometers: Enhance knee injury treatment Knee Stability/Instability Diagnostic Device
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    The LDA® Method - Objective knee joint laxity test
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    WHAT IS LAXIMETRY?

    Definition of laximetry

    The simplest definition that we could attribute to laximetry is the following: it is the objective evaluation of knee laxity.

    In order to manage an anterior cruciate ligament (ACL) injury, accurate assessment of knee laxity is crucial to be efficient. While clinical physical maneuvers are essential, they often rely on subjective factors such as clinician experience, muscle relaxation, and inherent knee variability. To analyze the state and performance of the ACL, advanced imaging techniques such as the MRI can also be used but cannot directly evaluate knee stability. Therefore, it is against this background that laximetry was set, to supplement physical exam findings.

    Techniques of laximetry have been introduced 30 to 40 years ago by quantifying the tibia displacement resulting from an applied force. Clinically speaking, laximetry is best described as a dichotomous tool used in combination with physical exam maneuvers for diagnostic purposes.

    In the past, laximetry was only used for research purposes because of its objective results which allowed comparison of different factors such as surgical techniques or rehabilitation regimens but nowadays, it is more and more common to use laximetry to monitor post-operative laxity.

    There are two main types of laximetry:

    • Stress imaging: It is a method of visual observation and quantification of the knee joint laxity in response to an applied stress. The TELOS is a common medical device that applies this type of laximetry.
    • Arthrometry: arthrometers are medical devices designed to apply a reproducible force across the knee and mechanically measure the resulting displacement. The GNRB is a common arthrometer/laximeter that applies this type of laximetry.

    Many devices have been designed during the past decades in both of these categories such as the TELOS concerning stress imaging and the KT 1000 for arthrometry but the problem relating to most of them is the fact that they only run static tests (result given while applying a single force on the knee).

    It is in this perspective that Genourob created the GNRB. This medical device indeed allows running dynamic tests on the knee. The GNRB is an automated dynamic laximeter (arthrometer).

    This characteristic makes this device unique of a kind much more efficient than any other arthrometer as it enables the user to objectively evaluate the knee stability and its displacement differential whereas other laximeters only put forward the displacement differential.

    Known arthrometers used in laximetry

    GNRB - Automated anterior drawer test for ACL assessment

    GNRB - Automated anterior drawer test for ACL assessment

    KT 1000

    KT 1000

    Rolimeter

    Rolimeter

    Telos

    Telos

    ROTAM - Motorized tibial rotation test for knee peripheral ligamentous structures assessment

    ROTAM - Motorized tibial rotation test for knee peripheral ligamentous structures assessment

    GNRB - Automated anterior drawer test for ACL assessment
    KT 1000
    Rolimeter
    Telos
    ROTAM - Motorized tibial rotation test for knee peripheral ligamentous structures assessment

    Concerning arthrometry, the most common arthrometers known in the orthopaedic field are the GNRB, the KT 1000, the KT 2000 and the rolimeter. Concerning stress imaging devices, the TELOS is the most common one found nowadays but unlike the GNRB, it is a very invasive device.

    The GNRB is the most recent and innovating arthrometer as it does dynamic ACL analysis by offering doctors the possibility of analyzing the compliance curves (opposite of stiffness curves) of the ACL using the LDA® Method.