GNRB With Rotab option - Knee Laxity Testing Device

Knee Ligaments Analysed: ACL

Tibial Movements: Anterior Translation + Medial Rotation

Genourob's GNRB arthrometer with Rotab is at the forefront of knee laxity testing. It precisely measures anterior tibial translation and medial rotation, offering a comprehensive analysis of ACL integrity. Essential for orthopedic surgeons and other specialists, it represents a leap in accurate ACL injury detection. Genourob's innovation empowers clinicians to refine their diagnostic processes for superior patient outcomes.


Table of Contents

GNRB With Rotab Option Arthrometer Features

  1. Medical Device: High-Tech Robotic Knee Laxity Arthrometer
  2. Knee Dynamic Assessments Performed:
    • Application of Anterior Tibial Translations to measure the state of resistance of the ACL.
    • Assessment of the Medial Rotation resulting from the Anterior Tibial Translation. The Rotation is not directly induced like with the Dyneelax.
  3. Software: LDA Software – A user-friendly software developed by Genourob for optimal objective testing of the knee ligaments with an easy to access exportable database.
  4. Population: Wide range of normative data, from pediatric through adults, ages 8 – 100.
  5. After Sale: Excellent after-sale support, installation and continuing education programs.
  6. Warranty: 2 year-warranty.
  7. Shipment: Worldwide.

GNRB Arthrometer

The 4 in 1 solution for those who value precision in knee ligaments assessments!

1) ACL Diagnosis
2) ACL Prevention
3) ACL Rehabilitation
4) ACL Follow-up

The GNRB Knee Laxity Arthrometer with Rotab Option represents the forefront of medical technology designed for the meticulous assessment, prevention, rehabilitation, and monitoring of knee ligament conditions. This device not only provides precise evaluations of knee laxity through automated anterior drawer tests, specifically focusing on the anterior cruciate ligament (ACL), but also stands apart by measuring the resultant medial rotation during anterior tibial translation.

Differing from traditional arthrometers, the GNRB with Rotab Option facilitates an automated anterior tibial translation, offering a comprehensive and precise insight into knee stability. Impressively, in the detection of partial ACL tears, the GNRB with Rotab Option surpasses MRI techniques, ensuring unmatched diagnostic precision. This superior accuracy paves the way for a tailored treatment plan, aligning perfectly with individual patient needs.

What is GNRB Rotab?

Unlock unparalleled clarity in knee ligament assessment with GNRB: where precision meets simplicity, redefining the gold standard in ligament diagnostics & Treatment.

Sensitivity: A Recent study (DOI: 10.1016/j.knee.2023.03.017) has shown GNRB & Dyneelax arthrometers exhibit superior sensitivity in diagnosing partial ACL ruptures. Where MRIs might miss or misinterpret the minutiae of a partial rupture, these arthrometers catch them.

Why Arthrometers Over MRI?

Cost-Efficient Diagnosis (90% Cost Reduction)

Economic benefits with reduced costs for both practitioners and patients.

Instantaneous & More Accurate Diagnostics

Immediate & accurate results about the state of resistance of the ACL without waiting for imaging processing.

Non-Invasive Evaluation

Reduces the need for invasive diagnostic procedures.

Free Space in MRI Rooms

Creates room for individuals battling more severe pathologies, like certain forms of Cancers.

Over a span of 17 years since Genourob introduced the groundbreaking computerized knee laxity arthrometer, the GNRB, the world has witnessed remarkable advancements in the field. This monumental innovation, coupled with subsequent developments like Dyneelax, has solidified our position as the arthrometer of choice in elite medical facilities and premier research institutions across the globe.

From the realms of sports medicine and orthopedics to child health care and further, professionals acknowledge the unparalleled significance of our knee laxity arthrometers. They shine as paragons of accuracy and dependability in the domain, attributed to the invaluable data they generate. But it’s not just data—it’s a conduit to enhanced patient health outcomes, the bedrock for influential studies, and the distinctive trait that propels an institution to distinguished heights.

How is GNRB Rotab used by Medical Practitioners?

GNRB: A 4 in 1 high-tech Medical Device

Diagnosis of ACL injuries

Harnessing GNRB, we redefine ACL injury diagnosis. Especially with partial ACL ruptures, surpassing MRI's capabilities. Enter a new era of confident, precise assessments. Your knee's health, unmistakably reaffirmed.

Rehabilitation of ACL Injuries

Embrace GNRB's revolutionary technology as we guide you through the journey of ACL injury rehabilitation. Witness a transformation in recovery, where hope meets innovation. Rebuild with confidence and conviction.

Spomed Dyneelax leg strepped.

Prevention of ACL Injuries

Utilizing the cutting-edge capabilities of GNRB, we unveil proactive strategies to prevent ACL injuries. Venture into a future where knee safety is prioritized. Protect and prevent, with assurance.

Follow-Up of the ACL

With GNRB as our compass, embark on a path of vigilant follow-up care for ACL injuries. Enter a realm where progress is measured, and healing is tracked with precision. Your journey, our commitment.

Discover Proven Outcomes

Case Studies

a window with a doctor in a room
2023 - GNRB® laximeter with magnetic resonance imaging in clinical practice for complete and partial anterior cruciate ligament tears detection: A prospective diagnostic study with arthroscopic validation on 214 patients.

DOI: 10.1016/j.knee.2023.03.017
Theo Cojean, Cecile Batailler, Henri Robert, Laurence Cheze
CHU Nantes, CHU Angers, CH Laval (French Hospitals)
A doctor writing on a white file. Arthrometer Rehabilitation Tech.
2023 - Sensitivity, repeatability and reproducibility study with a leg prototype of a recently developed knee arthrometer: The DYNEELAX®

DOI: 10.1016/j.medntd.2023.100254
Theo Cojean, Cecile Batailler, Henri Robert, Laurence Cheze
Université Gustave Eiffel, Lyon, France

In which Healthcare Departments is GNRB utilized?

What defines GNRB Rotab as a crucial asset in top-tier facilities and what features does it offer?

Enhanced Objective Knee Laxity Testing through Dynamic Assessments

Harness the advanced capabilities of our arthrometer, uniquely tailored with the Rotab option, to delve deep into the multifaceted behavior of the ACL during anterior tibial translation and medial rotation.

The GNRB with Rotab option represents an evolutionary leap in knee laxity evaluations, providing dual-dimensional insights by simultaneously assessing anterior tibial translation and the consequential medial rotation. This feature-rich device transcends conventional boundaries, offering precise measurements that reduce the ambiguity often inherent in traditional assessments. As corroborated by the 2023 study by [Theo Cojean], its avant-garde design and performance on a leg prototype underscore its unparalleled proficiency.

Objective evaluations come to life through intuitive graphical representations, delineating the nuanced interplay between force applications and the tibia's response. Such granular insights are paramount in distinguishing healthy knees from those with compromised ACL integrity. The precision with which the GNRB with Rotab option gauges knee dynamics, particularly in comparison to renowned models like the KT-1000 and KT-2000, solidifies its position as a market frontrunner in ACL analysis.

In 2023, a study by Theo Cojean highlighted GNRB's sensitivity, repeatability, and reproducibility. Furthermore, studies from 2012 Collette et al., 2017 Jenny et al., 2022 Kayla Smith, and 2023 Magdic have validated the efficiency of GNRB in diagnosing ACL ruptures, reinforcing their clinical significance. It should be noted that GNRB technology is incorporated in the Dyneelax.

a patient looking at theipad of a doctor.
Knee Orthopedics: orthopaedic surgeon
a Doctor with an ipad
A doctor writing on a white file. Arthrometer Rehabilitation Tech.
GNRB Device - ACL Assessment- Knee Laxity Testing Device

The GNRB with Rotab option stands as a hallmark of diagnostic precision, especially when delving into the complexities of partial ACL (anterior cruciate ligament) tears. By applying anterior tibial translation, it meticulously analyzes the ACL while simultaneously measuring the ensuing medial rotation. This dual-action approach, unique to the Rotab variant, offers an unparalleled detection rate for partial ACL disruptions, often surpassing the diagnostic acuity of MRIs2023 – [Theo Cojean] – A prospective diagnostic comparison between the GNRB and MRI was undertaken in real-world clinical settings. The results, validated by arthroscopy on 214 patients, demonstrated the superiority of the GNRB in identifying both complete and partial ACL tears.

The enhanced diagnostic precision underlines not only the GNRB’s expertise but also underscores its economic advantage and user-friendliness compared to MRI, thereby addressing the limitations MRI presents in diagnosing partial ACL tears.

Beyond its pinpoint accuracy and economic appeal, the GNRB with Rotab champions user-ease, delivering insights that require minimal training for interpretation. As a multifaceted instrument, it streamlines the processes of diagnosis, prevention, rehabilitation, and patient monitoring concerning knee ligament concerns. With its objective, refined, and immediate feedback, the GNRB with Rotab emerges as the foremost solution for diagnosing both complete & partial ACL tears, positioning itself as a timely, budget-conscious, and user-centric alternative to MRI.

The precision and consistency exemplified by the outcomes from the GNRB with Rotab option manifest its steadfast reliability for comprehensive ACL assessments. This remarkable reproducibility stems from the integration of advanced sensors and clear-cut protocols, simplifying user interactions and significantly enhancing assessment precision. A distinguishing feature of the GNRB with Rotab is its unique ability to consistently apply anterior tibial translation and measure the consequential medial rotation with unwavering accuracy. This ensures optimal patient positioning for every test, facilitating impeccable control over the testing environment and enabling a fluid comparison of results across various timeframes. Such detail is crucial for longitudinal studies and post-operative ACL evaluations.

The consistent testing parameters and resultant data uniformity not only vouch for the GNRB with Rotab’s credibility but also amplify its reputation within the medical fraternity. Evidenced in research, such as that by Klasan, the GNRB with Rotab stood its ground when juxtaposed with other arthrometers like the KT1000, showcasing accuracy akin to premier navigation systems. A 2023 study led by Renata Vauhnik in Slovenia underscored the GNRB’s unmatched reproducibility, elevating its stature in providing trustworthy, consistent, and unbiased ACL evaluations. Continually earning accolades from clinical and scholarly sectors, the GNRB with Rotab stands out as an indispensable instrument for healthcare experts striving for meticulous and standardized ACL analysis.

Precision & Reproducibility: The GNRB Arthrometer's Credibility in Consistent Knee Laxity Assessments

The GNRB with Rotab option is a state-of-the-art knee laxity arthrometer, meticulously designed to enhance patient safety, especially in the context of post-Anterior Cruciate Ligament (ACL) reconstruction. Among healthcare professionals, there is a prevalent concern about inadvertently damaging the ACL graft during evaluation. However, it’s imperative to note that the GNRB with Rotab option has been meticulously engineered to remain within safe and permissible force parameters. To provide perspective, everyday actions like walking can expose the ACL to forces approximating 350N(Download Nagura Study – 2006 or DOI: 10.1123/jab.22.4.305). Conversely, the GNRB with Rotab option adeptly delivers a prudent 100N of force during anterior tibial translation. This ensures not only objective ACL analysis but also accurately gauges the resultant medial rotation occurring simultaneously. By doing so, it drastically reduces potential risks to the graft. Such careful considerations underline our commitment to patient safety and position the GNRB with Rotab option as a benchmark in arthrometer technology. Trust in its design, invest in its capabilities, and witness unparalleled accuracy in ACL assessment.

Safe ACL Assessments with GNRB

Operating under the meticulous oversight of a cutting-edge computer system, the GNRB Arthrometer ensures both safety and consistency in its evaluations. Its detailed calibration is pivotal for providing precise insights pre & post-surgery, shedding light on graft conditions and the intricate journey of healing. The insights harvested from these evaluations are invaluable, equipping medical professionals with nuanced feedback during the crucial recuperative phase following surgery. This rich data serves as the keystone for crafting individualized rehabilitation blueprints, ensuring the promise of enduring knee stability for years to come. Bertrand Semay’s 2016 study (DOI: 10.1016/ focuses on the evolution of anteroposterior laxity in ACL reconstruction patients, measured by the GnRB device at 6, 9, and 12 months post-surgery (. It underscores the importance of monitoring ligament laxity for effective rehabilitation. 

Furthermore, Nouveau’s 2017 research (DOI: 10.24966/ORP-2052/100035) investigates the impact of early rehabilitation activities on the stiffness of ACL grafts, emphasizing the significance of balancing early mobilization with graft healing. Another interesting study is from Forelli in 2023 (DOI: 10.26603/001c.73031). It introduces a comprehensive rehabilitation approach, particularly for soccer players, stressing the need for a blend of clinical and sport-specific assessments to ensure a successful and safe return to play. These studies collectively advance the understanding of ACL injury management from surgical recovery to customized rehabilitation.

Thanks to its motorized functionalities, the GNRB Arthrometer with the Rotab option paves the way for assessments as early as a month post-operation, leveraging minimal forces and rotations to ensure thorough yet gentle analysis. The GNRB Arthrometer’s design, steeped in precision and rigorous control mechanisms, underscores its steadfast dedication to patient well-being. In the evolving world of knee ligament diagnostics and treatment modalities, it stands as an essential apparatus. Encouraging investments in such sophisticated devices promises a future of informed decisions and optimal patient outcomes.

Integrated Software and Assured Durability: Our Organizational and Warranty Commitments

hands typing on a laptop

The harmonious synergy between our instruments and the exclusive LDA software stands as a testament to Genourob’s commitment to streamlined, proficient functionality. Tailored meticulously by Genourob, the LDA software is indispensable for conducting tests using the arthrometers, particularly when evaluating the anterior tibial translation and the resulting medial rotation in the GNRB with Rotab option. This software exemplifies a superior fusion of practical attributes with a user-centric design. Not only does it simplify the assessment procedures, but it also serves as a consolidated database, diligently documenting each patient’s assessment. Digitalized results that are auto-archived mean managing comprehensive data is considerably more manageable. Such methodical structuring elevates the operational flow and bolsters enhanced intercommunication, guaranteeing pivotal data is both instantaneously available and securely archived.

Our confidence in the robustness and reliability of our instruments is bolstered by presenting a 2-year warranty. This warranty is a testament to the scrupulous artisanship and strict quality checks that are foundational to our production sequence. Patrons can be assured that their selected instrument, specifically designed for ACL analysis, is constructed to endure rigorous clinical applications, fortified by the assurance of warranty coverage. These warranty provisions underscore our relentless endeavor towards client gratification and our steadfast commitment to delivering premier quality products.

What are the Technical Specifications of GNRB?

Main Specifications

  • The medical device is a device to help diagnose partial or total lesions of the knee’s cruciate ligament
  • Must be used by a healthcare professional
  • The device can be used to help with diagnosis, to follow the evolution of a pathology or ligamentoplasty (cruciate ligament operation).
  • The principle of the device is to apply a thrust force on the calf thanks to an articulated mechanical system and to record the displacement of the tibia in relation to the femur for each force thanks to a sensor placed on the Anterior Tibial Tuberosity (ATT).
  • Measurements are taken on both lower limbs and the analysis of the lesions can be done by observingthe difference between these two values and especially by comparing the slope of the curves obtained.
  • The system includes a 3-level safety system based on mechanic and software controlled mechanism.

Software Specifications

  • The software ensures optimal use of the product to avoid handling errors. Very intuitive and easy to use, the operator is guided on the different parameters to be validated before launching the tests.
  • The system allows for easy register of patient.
  • The software should automatically apply chosen test.
  • The software helps to practice a test with the same parameter from the most recent examen.
  • The software offers a easy-to-read graphs with colors accompanied by a chart.

Standard Accessories

  • Operating instructions
  • Computer/tablet
  • Software
  • Power cable
  • USB cable

Optional Accessory

  • PCL Option
  • Rotab Option
  • Radio Option

Technical Data

  • Power Supply: Input Voltage 230 VAC, Input Frequencies 50 or 60 Hz
  • Dimension (standard position): 930 x 270 x 500 mm
  • Weight: 15Kg
  • Maximum Patient Weight: 135Kg

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