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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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Wear and Friction of UHMWPE-on-PEEK OPTIMA™. J Mech Behav Biomed Mater 2018; 89:65-71. [PMID: 30265867 PMCID: PMC6195677 DOI: 10.1016/j.jmbbm.2018.09.021] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Revised: 09/11/2018] [Accepted: 09/17/2018] [Indexed: 12/28/2022]
Abstract
PEEK-OPTIMA™ is being considered as an alternative bearing material to cobalt chrome in the femoral component of total knee replacement to provide a metal-free implant. The aim of this study was to investigate the influence of lubricant temperature (standard rig running and elevated temperature (~36 °C)) on the wear of a UHMWPE-on-PEEK OPTIMA™ bearing couple using different lubricant protein concentrations (0%, 2%, 5%, 25% and 90% bovine serum) in a simple geometry pin-on-plate configuration. Friction was also investigated under a single temperature condition for different lubricant protein concentrations. The studies were repeated for UHMWPE-on-cobalt chrome in order to compare relationships with temperature (wear only) and lubricant protein concentration (wear and friction). In low lubricant protein concentrations (≤ 5%) there was no influence of temperature on the wear factors of UHMWPE-on-PEEK. With 25% bovine serum, the wear factor of UHMWPE-on-PEEK reduced by half at elevated temperature. When tested in high protein concentration (90% serum), there was no influence of temperature on the wear factor of UHMWPE-on-PEEK. These temperature dependencies were not the same for UHMWPE-on-cobalt chrome. For both material combinations, there was a trend of decreasing friction with increasing protein concentration once protein was present in the lubricant. This study has shown the importance of the selection of appropriate test conditions when investigating the wear and friction of different materials, in order to minimise test artefacts such as polymer transfer, and protein precipitation and deposition.
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