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    The DYNEELAX robotic arthrometer is the first arthrometer that applies both anterior tibial translation and medial/lateral rotation to run dynamic & objective knee stability assessments.

    Anterior Tibial Translation + Induced Medial/ Lateral Tibial Rotation - Fully Automated

    The anterior cruciate ligament (ACL) was for GENOUROB the first knee ligament intended to be studied thanks to the GNRB. However today, we managed to come up with a single arthrometer (aka. laximeter) capable of performing knee translation + rotation stability assessment. This knee laxity testing device is called the DYNEELAX.

    At Genourob, we believe that arthrometers should be used on a common basis when suspecting knee ligament injuries and not just for research thus the reason why we created the DYNEELAX robotic arthrometer to perform dynamic & objective assessments of knee stability.

    DYNEELAX is a 4 in 1 device as it allows diagnosispreventionrehabilitation and follow-up of patients suffering from knee ligament injuries. It currently the most accurate & reproducible knee arthrometer regarding knee ligament assessment as it is the only one that is completely automated & computerised.

    Dyneelax - Automated lachman test + Induced Tibial Rotation for Knee Laxity Assessment


    Graph 1

    Graph 1

    Graph 1 shows the results obtained after performing tests on both knees of a patient with the DYNEELAX. The graph displays the compliance curves (=opposite of stiffness curves) obtained after applying several forces on the tibia of the patient (anterior tibial translation).

    The green curve represents the data collected on the healthy knee while the red curve represents the pathological knee.

    This is called "dynamic analysis" because calculation of the displacements of the tibia is done while applying different forces that put the anterior cruciate ligament under stress (from 0 to 200N for example) to enable the drawing of compliance curves (=opposite of stiffness curves). As a result, the bigger the side-to-side differential, the higher the chances of an anterior cruciate ligament tear.

    In comparison, other arthrometers  only collect data at a certain force (134 N for example). This is called "static analysis".

    It is thus against this background that Genourob innovated while conceptualizing the DYNEELAX, the first automated tibial translation arthrometer for dynamic assessment of the anterior cruciate ligament.


    Graph 2

    Graph 2

    Graph 2 shows the curve results with its table chart obtained after performing tests on both knees of a same patient with the DYNEELAX. The graph shows the curves obtained after applying several torques on the tibia of the patient to perform a motorized tibial rotation.

    This is called a dynamic analysis because calculation of the degree of rotation of the tibia is done while applying different forces which put the knee peripheral ligamentous structures under stress. Therefore, the bigger the rotation degree differential, the higher the chances are that knee peripheral structures have been injured.

    How is DYNEELAX more accurate than any other arthrometer?

    Here is an example to answer this question :

    The two graphs below show the results obtained on the knees of two different patients having suffered from knee ligament injuries after a DYNEELAX test. The green curves show the test results of the healthy knees whereas the red curves show the results of the pathological knees.

    Graph Results of two different patients

    Graph Results of two different patients

    As 134 N is the international reference force for assessing the ACL thanks to the KT1000, let us compare the displacement differential between both knees of both patients at this force.

    We can see here that the side-to-side displacement differential at 134 N is the same for both patients (1.5 mm). This should indicate that both patients are not suffering from a torn ACL. However, it not the case. The DYNEELAX indeed shows innovation & precision in this exact situation as it provide an additional diagnosis method: the analysis of the slope of the curves.

    In fact, we can determine that Patient 1 has a stable knee while Patient 2 is unstable. Why?

    Because on the graph of patient 1, the ACL compliance curves (=opposite of stiffness curves) are parallel and on the graph of patient 2 the ACL compliance curves (=opposite of stiffness curves) diverge.

    This indeed shows that patient 1 has two stable knees with a slight side-to-side difference in laxity that remains the same eventhough the force applied on the knee increases. This indicates a stable knee. However, patient 2 clearly shows an increasing side-to-side difference in laxity correlated with the increase of the force applied on the knees, hence the objective diagnosis of an unstable knee.

    This example purely states the efficiency of running dynamics tests against static tests on the knee. Considering the slope differential between both compliance (=opposite of stiffness) curves on behalf of the displacement differential between both knees ultimately leads to a much more accurate analysis of the state of the ACL in the knee.

    Usable PRE-OP & POST-OP...

    Consequently, the DYNEELAX places itself as the most advanced arthrometer for evaluating the state of the anterior cruciate ligament as it is the only device capable of assessing ACL laxity very soon after surgery without any risk thanks to its controlled tibial translation (maximum forces applied can be chosen: 89, 100, 134, 150, 200 Newtons). 

    Doctors are indeed able to follow the behaviour of the ACL graft during the first months following the surgery, which is key to increasing the probability of gaining knee stability. Today's surgical techniques indeed require a lot of time of recovering therefore making the DYNEELAX indispensable during anterior cruciate ligament rehabilitation (ACL Rehab).

    DYNEELAX main characteristics for optimal ACL assessment

    • Device using LDA® Method applying anterior tibial translation (Lachman's Test) for ACL and knee stability objective evaluation.
    • Dynamic and none-invasive tests.
    • Automatic tibial displacement differential and compliance curves slope differential calculation.
    • Registration of the patellar fixation force and patient foot / Base of the machine distance for reproducibility.
    • Delivery with PC and LDA® Software.
    • Thrust force from 1 to 200 N.
    • Patient data automatically saved, results exportable as xls. files, pdf. format for great communication.
    • Dimensions : 845 x 270 x 400mm / 15kg.

    DYNEELAX additionnal options

    • Over time, Genourob created several options that could be added to the GNRB such as the PCL option dedicated to analyzing the knee cruciate ligament, the posterior cruciate ligament (PCL).
    • Finally, the DYNEELAX is automatically features with the LDA®Couch which provides the patient with great comfort and is specially designed for our products.
    • the LDA®Trolley can also be provided for storage of the laptop and a printer for printing the results.