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Vanaclocha A, Vanaclocha V, Atienza CM, Jorda-Gomez P, Diaz-Jimenez C, Garcia-Lorente JA, Saiz-Sapena N, Vanaclocha L. ADDISC lumbar disc prosthesis: Analytical and FEA testing of novel implants. Heliyon 2023; 9:e13540. [PMID: 36816293 PMCID: PMC9929472 DOI: 10.1016/j.heliyon.2023.e13540] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 02/01/2023] [Accepted: 02/02/2023] [Indexed: 02/07/2023] Open
Abstract
The intact intervertebral disc is a six-freedom degree elastic deformation structure with shock absorption. "Ball-and-socket" TDR do not reproduce these properties inducing zygapophyseal joint overload. Elastomeric TDRs reproduce better normal disc kinematics, but repeated core deformation causes its degeneration. We aimed to create a new TDR (ADDISC) reproducing healthy disc features. We designed TDR, analyzed (Finite Element Analysis), and measured every 500,000 cycles for 10 million cycles of the flexion-extension, lateral bending, and axial rotation cyclic compression bench-testing. In the inlay case, we weighted it and measured its deformation. ADDISC has two semi-spherical articular surfaces, one rotation centre for flexion, another for extension, the third for lateral bending, and a polycarbonate urethane inlay providing shock absorption. The first contact is between PCU and metal surfaces. There is no metal-metal contact up to 2000 N, and CoCr28Mo6 absorbs the load. After 10 million cycles at 1.2-2.0 kN loads, wear 140.96 mg (35.50 mm3), but no implant failures. Our TDR has a physiological motion range due to its articular surfaces' shape and the PCU inlay bumpers, minimizing the facet joint overload. ADDISC mimics healthy disc biomechanics and Instantaneous Rotation Center, absorbs shock, reduces wear, and has excellent long-term endurance.
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Affiliation(s)
- Amparo Vanaclocha
- Escuela de Doctorado, Universitat Politècnica de Valencia, Camí de Vera, s/n, 46022, Valencia, Spain
| | - Vicente Vanaclocha
- University of Valencia, Avenida de Blasco Ibáñez, 15, 46010 Valencia, Spain,Corresponding author.
| | - Carlos M. Atienza
- Instituto de Biomecánica (IBV), Universitat Politècnica de Valencia, Camí de Vera, s/n, 46022 Valencia, Spain,Instituto de Biomecánica de Valencia-CIBER BBN, Grupo de Tecnología Sanitaria (GTS-IBV), Camí de Vera, s/n, 46022 Valencia, Spain
| | - Pablo Jorda-Gomez
- Hospital General Universitario de Castellón, Avenida de Benicàssim, 128, 12004 Castelló de la Plana, Spain
| | - Cristina Diaz-Jimenez
- Industry Association of Navarra, Carretera de Pamplona, 1, 31191 Cordovilla, Navarra, Spain
| | | | - Nieves Saiz-Sapena
- Hospital General Universitario de Valencia, Avenida Tres Cruces 2, Valencia, Spain
| | - Leyre Vanaclocha
- Medius Klinik, Ostfildern-Ruit Klinik für Urologie, Hedelfinger Strasse 166, 73760 Ostfildern, Esslingen, Baden-Wurtemberg, Germany
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Kandemir G, Smith S, Andrews J, Bowey A, Joyce TJ. Retrieval analysis of an explanted NuNec cervical disc: A case report. ACTA ACUST UNITED AC 2020. [DOI: 10.1016/j.biotri.2020.100150] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Moghadas P, Mahomed A, Shepherd DET, Hukins DWL. Wear of the Charité® lumbar intervertebral disc replacement investigated using an electro-mechanical spine simulator. Proc Inst Mech Eng H 2016; 229:264-8. [PMID: 25834002 PMCID: PMC4456431 DOI: 10.1177/0954411915576537] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The Charité® lumbar intervertebral disc replacement was subjected to wear testing in an electro-mechanical spine simulator. Sinusoidally varying compression (0.6–2 kN, frequency 2 Hz), rotation (±2°, frequency 1 Hz), flexion–extension (6° to −3°, frequency 1 Hz) and lateral bending (±2°, frequency 1 Hz) were applied out of phase to specimens immersed in diluted calf serum at 37 °C. The mass of the ultra-high-molecular weight polyethylene component of the device was measured at intervals of 0.5, 1, 2, 3, 4 and 5 million cycles; its volume was also measured by micro-computed tomography. Total mass and volume losses were 60.3 ± 4.6 mg (mean ± standard deviation) and 64.6 ± 6.0 mm3. Corresponding wear rates were 12.0 ± 1.4 mg per million cycles and 12.8 ± 1.2 mm3 per million cycles; the rate of loss of volume corresponds to a mass loss of 11.9 ± 1.1 mg per million cycles, that is, the two sets of measurements of wear agree closely. Wear rates also agree closely with measurements made in another laboratory using the same protocol but using a conventional mechanical spine simulator.
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Affiliation(s)
- Parshia Moghadas
- School of Mechanical Engineering, University of Birmingham, Birmingham, UK
| | - Aziza Mahomed
- School of Mechanical Engineering, University of Birmingham, Birmingham, UK
| | | | - David W L Hukins
- School of Mechanical Engineering, University of Birmingham, Birmingham, UK
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