The Experts below are selected from a list of 204 Experts worldwide ranked by ideXlab platform
Jean Patrick Rakover - One of the best experts on this subject based on the ideXlab platform.
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THE VISCOELASTIC CP-ESP CERVICAL DISC Prosthesis WITH 6 DEGREES OF FREEDOM: A PROSPECTIVE STUDY OF 49 PATIENTS WITH MINIMUM ONE-YEAR FOLLOW-UP
Journal of Bone and Joint Surgery-british Volume, 2020Co-Authors: Jean-yves Lazennec, Olivier Ricart, Adrien Brusson, Jean Patrick RakoverAbstract:Introduction The viscoelastic cervical Disk Prosthesis ESP is an innovative one-piece deformable but cohesive interbody spacer. It is an evolution of the LP ESP lumbar Disk implanted since 2006. CP ESP provides 6 full degrees of freedom about the 3 axes including shock absorption. The Prosthesis geometry allows limited rotation and translation with resistance to motion (elastic return property) aimed at avoiding overload of the posterior facets. The rotation center can vary freely during motion (figure 1) It thus differs substantially from current prostheses. This study reports the results of a prospective series of 49 patients who are representative of the current use of the ESP implant since 2012. Material and methods The surgeries were performed by 3 senior surgeons. There were 34 women and 15 men in this group. The average age was 44±7 (32–59). The implantation was single level in 78 % of cases. 55 CP ESP prostheses were analyzed. Clinical data and X-rays were collected at the preoperative time and at 3, 6, and 12 months post-op. The functional results were measured using Neck and Arm VAS, NDI, SF-36, (physical componentPCS and mental component MCS). The analysis was performed by a single observer who was independent from the selection of patients and from the surgical procedure. Results The mean operative time was 48 min (SD: 10 min). We did not observe device-related specific complications. All clinical outcomes significantly improved at every time points when compared to the pre-operative status (table 1). In the series, 86 % of patients had a good or excellent result at 3 months, 78 % at 6 months, and 88 % at 12 months. Conclusion The concept of the ESP Prosthesis is different from that of the articulated devices currently used in the cervical spine. This study reports encouraging clinical results about pain, function, kinematic behavior and ROM.
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CP-ESP VISCOELASTIC CERVICAL DISC REPLACEMENT: TWO YEARS' FOLLOW-UP WITH CLINICAL AND RADIOLOGICAL RESULTS. EVOLUTION OF SEGMENTAL MOBILITY AND LOCATION OF MEAN CENTRES OF ROTATION
2019Co-Authors: Jean-yves Lazennec, Olivier Ricart, Jean Patrick Rakover, B Rischke, Marc-antoine RousseauAbstract:Introduction The viscoelastic cervical Disk Prosthesis CP-ESP is an innovative one-piece deformable but cohesive interbody spacer. It is an evolution of the LP-ESP lumbar Disk implanted since 2006....
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The innovative viscoelastic CP ESP cervical Disk Prosthesis with six degrees of freedom: biomechanical concepts, development program and preliminary clinical experience
European Journal of Orthopaedic Surgery & Traumatology, 2016Co-Authors: Jean-yves Lazennec, Alain Aaron, Olivier Ricart, Jean Patrick RakoverAbstract:The viscoelastic cervical Disk Prosthesis ESP is an innovative one-piece deformable but cohesive interbody spacer. It is an evolution of the LP ESP lumbar Disk implanted since 2006. CP ESP provides six full degrees of freedom about the three axes including shock absorbtion. The Prosthesis geometry allows limited rotation and translation with resistance to motion (elastic return property) aimed at avoiding overload of the posterior facets. The rotation center can vary freely during motion. The concept of the ESP Prosthesis is fundamentally different from that of the devices currently used in the cervical spine. The originality of the concept of the ESP^® Prosthesis led to innovative and intense testing to validate the adhesion of the viscoelastic component of the Disk on the titanium endplates and to assess the mechanical properties of the PCU cushion. The preliminary clinical and radiological results with 2-year follow-up are encouraging for pain, function and kinematic behavior (range of motion and evolution of the mean centers of rotation). In this series, we did not observe device-related specific complications, misalignment, instability or ossifications. Additional studies and longer patient follow-up are needed to assess long-term reliability of this innovative implant.
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The Viscoelastic LP-ESP Lumbar Disc Prosthesis With 6 Degrees of Freedom: A Prospective Study of 120 Patients With Two Years' Minimum Follow-Up
Journal of Bone and Joint Surgery-british Volume, 2013Co-Authors: Jean-yves Lazennec, Jean Patrick Rakover, Adrien Brusson, Ma RousseauAbstract:Introduction The viscoelastic lumbar Disk Prosthesis ESP is an innovative one-piece deformable but cohesive interbody spacer; it provides 6 full degrees of freedom about the 3 axes including shock absorption. The Prosthesis geometry allows limited rotation and translation with resistance to motion (elastic return property) aimed at avoiding overload of the posterior facets. The rotation center can vary freely during motion. It thus differs substantially from current prostheses. This study reports the results of a prospective series of 120 patients who are representative of the current use of the ESP implant since 2006. Material and methods The surgeries were performed by 2 senior surgeons. There were 73 women and 47 men in this group. The average age was 42 (27–60). The average body mass index was 24.2 kg/m2 (18–33). The implantation was single level in 89% of cases. 134 ESP prostheses were analyzed. Clinical data and X-rays were collected at the preoperative time and at 3, 6, 12, 24, and 36 months post-op. The functional results were measured using VAS, GHQ 28, ODI, SF-36, (physical component PCS and mental component MCS. The analysis was performed by a single observer who was independent from the selection of patients and from the surgical procedure. Results The mean operative time was 92 min (SD: 49 min). The mean blood loss was 73 cc (SD: 162 cc). We did not observe device-related specific complications. All clinical outcomes significantly improved at every time points when compared to the pre-operative status (table 1). In the series, 89% of patients had a good or excellent result at 3 months, 88% at 6 and 12 months, and 93% at 24 months. Conclusion The concept of the ESP Prosthesis is different from that of the articulated devices currently used in the lumbar spine. This study reports encouraging clinical results about pain, function, kinematic behavior and radiological sagittal balance. The results are in accordance with previous data collected since the first cases performed in 2005.
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The LP-ESP^® lumbar disc Prosthesis with 6 degrees of freedom: development and 7 years of clinical experience
European Journal of Orthopaedic Surgery & Traumatology, 2013Co-Authors: Jean-yves Lazennec, Alain Aaron, Jean Patrick Rakover, Adrien Brusson, Marc-antoine RousseauAbstract:The viscoelastic lumbar Disk Prosthesis-elastic spine pad (LP-ESP^®) is an innovative one-piece deformable but cohesive interbody spacer providing 6 full degrees of freedom about the 3 axes, including shock absorption. A 20-year research program has demonstrated that this concept provides mechanical properties very close to those of a natural Disk. Improvements in technology have made it possible to solve the problem of the bond between the elastic component and the titanium endplates and to obtain an excellent biostability. The Prosthesis geometry allows limited rotation and translation with resistance to motion (elastic return property) aimed at avoiding overload of the posterior facets. The rotation center can vary freely during motion. It thus differs substantially from current prostheses, which are 2- or 3-piece devices involving 1 or 2 bearing surfaces and providing 3 or 5 degrees of freedom. This design and the adhesion-molding technology differentiate the LP-ESP Prosthesis from other mono-elastomeric prostheses, for which the constraints of shearing during rotations or movement are absorbed at the endplate interface. Seven years after the first implantation, we can document in a solid and detailed fashion the course of clinical outcomes and the radiological postural and kinematic behavior of this Prosthesis.
Jean-yves Lazennec - One of the best experts on this subject based on the ideXlab platform.
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THE VISCOELASTIC CP-ESP CERVICAL DISC Prosthesis WITH 6 DEGREES OF FREEDOM: A PROSPECTIVE STUDY OF 49 PATIENTS WITH MINIMUM ONE-YEAR FOLLOW-UP
Journal of Bone and Joint Surgery-british Volume, 2020Co-Authors: Jean-yves Lazennec, Olivier Ricart, Adrien Brusson, Jean Patrick RakoverAbstract:Introduction The viscoelastic cervical Disk Prosthesis ESP is an innovative one-piece deformable but cohesive interbody spacer. It is an evolution of the LP ESP lumbar Disk implanted since 2006. CP ESP provides 6 full degrees of freedom about the 3 axes including shock absorption. The Prosthesis geometry allows limited rotation and translation with resistance to motion (elastic return property) aimed at avoiding overload of the posterior facets. The rotation center can vary freely during motion (figure 1) It thus differs substantially from current prostheses. This study reports the results of a prospective series of 49 patients who are representative of the current use of the ESP implant since 2012. Material and methods The surgeries were performed by 3 senior surgeons. There were 34 women and 15 men in this group. The average age was 44±7 (32–59). The implantation was single level in 78 % of cases. 55 CP ESP prostheses were analyzed. Clinical data and X-rays were collected at the preoperative time and at 3, 6, and 12 months post-op. The functional results were measured using Neck and Arm VAS, NDI, SF-36, (physical componentPCS and mental component MCS). The analysis was performed by a single observer who was independent from the selection of patients and from the surgical procedure. Results The mean operative time was 48 min (SD: 10 min). We did not observe device-related specific complications. All clinical outcomes significantly improved at every time points when compared to the pre-operative status (table 1). In the series, 86 % of patients had a good or excellent result at 3 months, 78 % at 6 months, and 88 % at 12 months. Conclusion The concept of the ESP Prosthesis is different from that of the articulated devices currently used in the cervical spine. This study reports encouraging clinical results about pain, function, kinematic behavior and ROM.
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CP-ESP VISCOELASTIC CERVICAL DISC REPLACEMENT: TWO YEARS' FOLLOW-UP WITH CLINICAL AND RADIOLOGICAL RESULTS. EVOLUTION OF SEGMENTAL MOBILITY AND LOCATION OF MEAN CENTRES OF ROTATION
2019Co-Authors: Jean-yves Lazennec, Olivier Ricart, Jean Patrick Rakover, B Rischke, Marc-antoine RousseauAbstract:Introduction The viscoelastic cervical Disk Prosthesis CP-ESP is an innovative one-piece deformable but cohesive interbody spacer. It is an evolution of the LP-ESP lumbar Disk implanted since 2006....
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The innovative viscoelastic CP ESP cervical Disk Prosthesis with six degrees of freedom: biomechanical concepts, development program and preliminary clinical experience
European Journal of Orthopaedic Surgery & Traumatology, 2016Co-Authors: Jean-yves Lazennec, Alain Aaron, Olivier Ricart, Jean Patrick RakoverAbstract:The viscoelastic cervical Disk Prosthesis ESP is an innovative one-piece deformable but cohesive interbody spacer. It is an evolution of the LP ESP lumbar Disk implanted since 2006. CP ESP provides six full degrees of freedom about the three axes including shock absorbtion. The Prosthesis geometry allows limited rotation and translation with resistance to motion (elastic return property) aimed at avoiding overload of the posterior facets. The rotation center can vary freely during motion. The concept of the ESP Prosthesis is fundamentally different from that of the devices currently used in the cervical spine. The originality of the concept of the ESP^® Prosthesis led to innovative and intense testing to validate the adhesion of the viscoelastic component of the Disk on the titanium endplates and to assess the mechanical properties of the PCU cushion. The preliminary clinical and radiological results with 2-year follow-up are encouraging for pain, function and kinematic behavior (range of motion and evolution of the mean centers of rotation). In this series, we did not observe device-related specific complications, misalignment, instability or ossifications. Additional studies and longer patient follow-up are needed to assess long-term reliability of this innovative implant.
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The Viscoelastic LP-ESP Lumbar Disc Prosthesis With 6 Degrees of Freedom: A Prospective Study of 120 Patients With Two Years' Minimum Follow-Up
Journal of Bone and Joint Surgery-british Volume, 2013Co-Authors: Jean-yves Lazennec, Jean Patrick Rakover, Adrien Brusson, Ma RousseauAbstract:Introduction The viscoelastic lumbar Disk Prosthesis ESP is an innovative one-piece deformable but cohesive interbody spacer; it provides 6 full degrees of freedom about the 3 axes including shock absorption. The Prosthesis geometry allows limited rotation and translation with resistance to motion (elastic return property) aimed at avoiding overload of the posterior facets. The rotation center can vary freely during motion. It thus differs substantially from current prostheses. This study reports the results of a prospective series of 120 patients who are representative of the current use of the ESP implant since 2006. Material and methods The surgeries were performed by 2 senior surgeons. There were 73 women and 47 men in this group. The average age was 42 (27–60). The average body mass index was 24.2 kg/m2 (18–33). The implantation was single level in 89% of cases. 134 ESP prostheses were analyzed. Clinical data and X-rays were collected at the preoperative time and at 3, 6, 12, 24, and 36 months post-op. The functional results were measured using VAS, GHQ 28, ODI, SF-36, (physical component PCS and mental component MCS. The analysis was performed by a single observer who was independent from the selection of patients and from the surgical procedure. Results The mean operative time was 92 min (SD: 49 min). The mean blood loss was 73 cc (SD: 162 cc). We did not observe device-related specific complications. All clinical outcomes significantly improved at every time points when compared to the pre-operative status (table 1). In the series, 89% of patients had a good or excellent result at 3 months, 88% at 6 and 12 months, and 93% at 24 months. Conclusion The concept of the ESP Prosthesis is different from that of the articulated devices currently used in the lumbar spine. This study reports encouraging clinical results about pain, function, kinematic behavior and radiological sagittal balance. The results are in accordance with previous data collected since the first cases performed in 2005.
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The LP-ESP^® lumbar disc Prosthesis with 6 degrees of freedom: development and 7 years of clinical experience
European Journal of Orthopaedic Surgery & Traumatology, 2013Co-Authors: Jean-yves Lazennec, Alain Aaron, Jean Patrick Rakover, Adrien Brusson, Marc-antoine RousseauAbstract:The viscoelastic lumbar Disk Prosthesis-elastic spine pad (LP-ESP^®) is an innovative one-piece deformable but cohesive interbody spacer providing 6 full degrees of freedom about the 3 axes, including shock absorption. A 20-year research program has demonstrated that this concept provides mechanical properties very close to those of a natural Disk. Improvements in technology have made it possible to solve the problem of the bond between the elastic component and the titanium endplates and to obtain an excellent biostability. The Prosthesis geometry allows limited rotation and translation with resistance to motion (elastic return property) aimed at avoiding overload of the posterior facets. The rotation center can vary freely during motion. It thus differs substantially from current prostheses, which are 2- or 3-piece devices involving 1 or 2 bearing surfaces and providing 3 or 5 degrees of freedom. This design and the adhesion-molding technology differentiate the LP-ESP Prosthesis from other mono-elastomeric prostheses, for which the constraints of shearing during rotations or movement are absorbed at the endplate interface. Seven years after the first implantation, we can document in a solid and detailed fashion the course of clinical outcomes and the radiological postural and kinematic behavior of this Prosthesis.
Marc-antoine Rousseau - One of the best experts on this subject based on the ideXlab platform.
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CP-ESP VISCOELASTIC CERVICAL DISC REPLACEMENT: TWO YEARS' FOLLOW-UP WITH CLINICAL AND RADIOLOGICAL RESULTS. EVOLUTION OF SEGMENTAL MOBILITY AND LOCATION OF MEAN CENTRES OF ROTATION
2019Co-Authors: Jean-yves Lazennec, Olivier Ricart, Jean Patrick Rakover, B Rischke, Marc-antoine RousseauAbstract:Introduction The viscoelastic cervical Disk Prosthesis CP-ESP is an innovative one-piece deformable but cohesive interbody spacer. It is an evolution of the LP-ESP lumbar Disk implanted since 2006....
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The LP-ESP^® lumbar disc Prosthesis with 6 degrees of freedom: development and 7 years of clinical experience
European Journal of Orthopaedic Surgery & Traumatology, 2013Co-Authors: Jean-yves Lazennec, Alain Aaron, Jean Patrick Rakover, Adrien Brusson, Marc-antoine RousseauAbstract:The viscoelastic lumbar Disk Prosthesis-elastic spine pad (LP-ESP^®) is an innovative one-piece deformable but cohesive interbody spacer providing 6 full degrees of freedom about the 3 axes, including shock absorption. A 20-year research program has demonstrated that this concept provides mechanical properties very close to those of a natural Disk. Improvements in technology have made it possible to solve the problem of the bond between the elastic component and the titanium endplates and to obtain an excellent biostability. The Prosthesis geometry allows limited rotation and translation with resistance to motion (elastic return property) aimed at avoiding overload of the posterior facets. The rotation center can vary freely during motion. It thus differs substantially from current prostheses, which are 2- or 3-piece devices involving 1 or 2 bearing surfaces and providing 3 or 5 degrees of freedom. This design and the adhesion-molding technology differentiate the LP-ESP Prosthesis from other mono-elastomeric prostheses, for which the constraints of shearing during rotations or movement are absorbed at the endplate interface. Seven years after the first implantation, we can document in a solid and detailed fashion the course of clinical outcomes and the radiological postural and kinematic behavior of this Prosthesis.
Alain Aaron - One of the best experts on this subject based on the ideXlab platform.
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The innovative viscoelastic CP ESP cervical Disk Prosthesis with six degrees of freedom: biomechanical concepts, development program and preliminary clinical experience
European Journal of Orthopaedic Surgery & Traumatology, 2016Co-Authors: Jean-yves Lazennec, Alain Aaron, Olivier Ricart, Jean Patrick RakoverAbstract:The viscoelastic cervical Disk Prosthesis ESP is an innovative one-piece deformable but cohesive interbody spacer. It is an evolution of the LP ESP lumbar Disk implanted since 2006. CP ESP provides six full degrees of freedom about the three axes including shock absorbtion. The Prosthesis geometry allows limited rotation and translation with resistance to motion (elastic return property) aimed at avoiding overload of the posterior facets. The rotation center can vary freely during motion. The concept of the ESP Prosthesis is fundamentally different from that of the devices currently used in the cervical spine. The originality of the concept of the ESP^® Prosthesis led to innovative and intense testing to validate the adhesion of the viscoelastic component of the Disk on the titanium endplates and to assess the mechanical properties of the PCU cushion. The preliminary clinical and radiological results with 2-year follow-up are encouraging for pain, function and kinematic behavior (range of motion and evolution of the mean centers of rotation). In this series, we did not observe device-related specific complications, misalignment, instability or ossifications. Additional studies and longer patient follow-up are needed to assess long-term reliability of this innovative implant.
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The LP-ESP^® lumbar disc Prosthesis with 6 degrees of freedom: development and 7 years of clinical experience
European Journal of Orthopaedic Surgery & Traumatology, 2013Co-Authors: Jean-yves Lazennec, Alain Aaron, Jean Patrick Rakover, Adrien Brusson, Marc-antoine RousseauAbstract:The viscoelastic lumbar Disk Prosthesis-elastic spine pad (LP-ESP^®) is an innovative one-piece deformable but cohesive interbody spacer providing 6 full degrees of freedom about the 3 axes, including shock absorption. A 20-year research program has demonstrated that this concept provides mechanical properties very close to those of a natural Disk. Improvements in technology have made it possible to solve the problem of the bond between the elastic component and the titanium endplates and to obtain an excellent biostability. The Prosthesis geometry allows limited rotation and translation with resistance to motion (elastic return property) aimed at avoiding overload of the posterior facets. The rotation center can vary freely during motion. It thus differs substantially from current prostheses, which are 2- or 3-piece devices involving 1 or 2 bearing surfaces and providing 3 or 5 degrees of freedom. This design and the adhesion-molding technology differentiate the LP-ESP Prosthesis from other mono-elastomeric prostheses, for which the constraints of shearing during rotations or movement are absorbed at the endplate interface. Seven years after the first implantation, we can document in a solid and detailed fashion the course of clinical outcomes and the radiological postural and kinematic behavior of this Prosthesis.
Olivier Ricart - One of the best experts on this subject based on the ideXlab platform.
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THE VISCOELASTIC CP-ESP CERVICAL DISC Prosthesis WITH 6 DEGREES OF FREEDOM: A PROSPECTIVE STUDY OF 49 PATIENTS WITH MINIMUM ONE-YEAR FOLLOW-UP
Journal of Bone and Joint Surgery-british Volume, 2020Co-Authors: Jean-yves Lazennec, Olivier Ricart, Adrien Brusson, Jean Patrick RakoverAbstract:Introduction The viscoelastic cervical Disk Prosthesis ESP is an innovative one-piece deformable but cohesive interbody spacer. It is an evolution of the LP ESP lumbar Disk implanted since 2006. CP ESP provides 6 full degrees of freedom about the 3 axes including shock absorption. The Prosthesis geometry allows limited rotation and translation with resistance to motion (elastic return property) aimed at avoiding overload of the posterior facets. The rotation center can vary freely during motion (figure 1) It thus differs substantially from current prostheses. This study reports the results of a prospective series of 49 patients who are representative of the current use of the ESP implant since 2012. Material and methods The surgeries were performed by 3 senior surgeons. There were 34 women and 15 men in this group. The average age was 44±7 (32–59). The implantation was single level in 78 % of cases. 55 CP ESP prostheses were analyzed. Clinical data and X-rays were collected at the preoperative time and at 3, 6, and 12 months post-op. The functional results were measured using Neck and Arm VAS, NDI, SF-36, (physical componentPCS and mental component MCS). The analysis was performed by a single observer who was independent from the selection of patients and from the surgical procedure. Results The mean operative time was 48 min (SD: 10 min). We did not observe device-related specific complications. All clinical outcomes significantly improved at every time points when compared to the pre-operative status (table 1). In the series, 86 % of patients had a good or excellent result at 3 months, 78 % at 6 months, and 88 % at 12 months. Conclusion The concept of the ESP Prosthesis is different from that of the articulated devices currently used in the cervical spine. This study reports encouraging clinical results about pain, function, kinematic behavior and ROM.
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CP-ESP VISCOELASTIC CERVICAL DISC REPLACEMENT: TWO YEARS' FOLLOW-UP WITH CLINICAL AND RADIOLOGICAL RESULTS. EVOLUTION OF SEGMENTAL MOBILITY AND LOCATION OF MEAN CENTRES OF ROTATION
2019Co-Authors: Jean-yves Lazennec, Olivier Ricart, Jean Patrick Rakover, B Rischke, Marc-antoine RousseauAbstract:Introduction The viscoelastic cervical Disk Prosthesis CP-ESP is an innovative one-piece deformable but cohesive interbody spacer. It is an evolution of the LP-ESP lumbar Disk implanted since 2006....
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The innovative viscoelastic CP ESP cervical Disk Prosthesis with six degrees of freedom: biomechanical concepts, development program and preliminary clinical experience
European Journal of Orthopaedic Surgery & Traumatology, 2016Co-Authors: Jean-yves Lazennec, Alain Aaron, Olivier Ricart, Jean Patrick RakoverAbstract:The viscoelastic cervical Disk Prosthesis ESP is an innovative one-piece deformable but cohesive interbody spacer. It is an evolution of the LP ESP lumbar Disk implanted since 2006. CP ESP provides six full degrees of freedom about the three axes including shock absorbtion. The Prosthesis geometry allows limited rotation and translation with resistance to motion (elastic return property) aimed at avoiding overload of the posterior facets. The rotation center can vary freely during motion. The concept of the ESP Prosthesis is fundamentally different from that of the devices currently used in the cervical spine. The originality of the concept of the ESP^® Prosthesis led to innovative and intense testing to validate the adhesion of the viscoelastic component of the Disk on the titanium endplates and to assess the mechanical properties of the PCU cushion. The preliminary clinical and radiological results with 2-year follow-up are encouraging for pain, function and kinematic behavior (range of motion and evolution of the mean centers of rotation). In this series, we did not observe device-related specific complications, misalignment, instability or ossifications. Additional studies and longer patient follow-up are needed to assess long-term reliability of this innovative implant.