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Technology Monograph

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ATTUNE GRADIUSTM Curve SOFCAMTM Contact LOGICLOCKTM Tibial Base GLIDERIGHTTM Articulation INTUITIONTM Instruments CONTENTS Introduction Development Process LOGICLOCK TM TIBIAL BASE The LOGICLOCKTM Tibial Base has a patented central locking design that provides the architecture for the system that optimizes kinematics, while reducing backside micromotion to the lowest reported levels in the industry. Patient Fit for Stability AOXTM Polyethylene Cruciate Sacrificing Wear Resistance

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INTRODUCTION Total knee replacement surgery can be a highly successful procedure. However, it is also a complex procedure. Surgeons are often faced with managing different patient anatomies and difficult intra-operative decisions. At the same time, hospitals are challenged to treat more patients with more efficient use of resources. Unfortunately, total knee patients are not always satisfied with their outcome and report differing levels of satisfaction following surgery.1,2 It is the goal of DePuy Synthes Joint Reconstruction* to design total knee systems that work with the surgeon and...

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DEVELOPMENT PROCESS The ATTUNE® Knee System represents one of the largest research and development projects in the history of DePuy Synthes Joint Reconstruction. Studies of total knee patients revealed that patients are not always satisfied with their outcome and report differing levels of satisfaction following surgery.1,2 As a result, improving implant performance and patient satisfaction was the focus of the ATTUNE Knee project from the beginning. At the same time, the demand for joint arthroplasties and increase in hospital costs is causing a significant economic burden to society. In...

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Patient Need VIEW GRAPH The ATTUNE Knee started with a patient need. While total knee replacement surgery can be a highly successful procedure, in some cases, patients report dissatisfaction or the implant fails prematurely. According to Baker et.al., approximately 10-20% of total knee patients are not satisfied with their knee replacement.2 While many hip replacement patients mention their “forgotten hip,” many knee replacement patients are reminded every day of their replaced knee. Certain functional activities, such as walking up and down stairs or bending down to greet their...

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Hospital Need Total knee replacement procedures are complex and can be inefficient compared to other joint arthroplasty procedures due to the number and weight of surgical instruments used. Currently, knee replacement procedures require multiple heavy instrument cases, making it difficult to handle the instruments. In addition, multiple trays and cases can make the surgical procedure less intuitive, which results in longer OR time and higher costs. New knee replacement technology and added demands for faster and less invasive surgeries have increased the complexity of sterile processing....

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Research and Development The development team took an exhaustive approach to the research and development process. With the goal of improving implant performance and patient satisfaction, the development process started with a foundation of understanding how the native knee moves and how traditional knee designs function in comparison. Historical methods for researching total knee designs were critically reviewed and as a result, new testing methods were developed, providing tools not previously available in the industry. Ultimately, the ATTUNE Knee System was designed and validated...

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Surgeon Design Team The surgeon design team represents key experts from seven countries around the world. This diverse team has varying philosophies with regards to PCL management, implant fixation, bearing preferences, and surgical technique. This vastly experienced team provided the diversity needed to create a knee system to accommodate surgeons and patients around the world. The surgeon design team was assembled into four sub-teams to assist in the design and development of the many different aspects of the ATTUNE Knee System. Each surgeon provided valuable insight and guidance within...

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External Collaboration Various research specialists from leading academic institutions were brought together to collaborate with the engineers from DePuy Synthes Joint Reconstruction and the surgeon design team. These individuals are known as experts in their field of study, such as kinematics, anthropometrics, polyethylene wear, and design. EXTERNAL SPECIALIST Instrument Technology & Processes Innovation RCA (Royal College of Art) Product (Instrument) Design Principles of In-Vivo Kinematics Tata Consultancy Services University College Dublin Computational Kinematics Experimental Kinematics...

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ATTUNE GRADIUS CURVE TM The patented sagittal geometry of the ATTUNE Femoral Components is a result of extensive research on the motion observed with traditional knee designs. ATTUNE GRADIUS™ Curve, the gradually reducing femoral radius, is designed to provide stability throughout the entire range of motion.12,13,14 The proprietary gradually reducing radius provides a smooth transition throughout the gait cycle. This unique feature of the ATTUNE Femoral Components is differentiated from traditional multi-radius or single radius designs. Unlike these other femoral geometries, the ATTUNE...

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To design the ATTUNE Femoral Geometry, extensive research was done to understand how traditional knee designs perform in total knee patients. This research began with the analysis of fluoroscopic studies. The abrupt changes in A/P stability reported are thought to be a factor leading to the lack of confidence reported by some patients following total knee replacement.15,16 This motion was replicated in experimental and computational models where the kinematics of existing designs were studied during various activities such as gait, stair descent, and a deep knee bend. This research led to...

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Anterior and Posterior Stability Anterior/posterior stability of the knee is determined in part by the geometry of the femoral component and its conformity with the articulation surface of the insert. Increased tibio-femoral conformity provides increased stability, while decreased conformity provides the freedom to move. It is important for a patient to have increased sagittal conformity in gait (0-60 degrees) to provide stability during high demand activities such as stair descent and walking across an uneven surface. These activities generate loads in the A/P plane in addition to the...

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