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Finite Element Analysis of Spine ProDisc-L Using Titanium, CFR-PEEK and CoCr Endplates with UHMWPE-GUR1020 75kGy RM Core

Authors :

Amirali Kashani¹ Siavash Kazemirad²

1- Iran University of Science and Technology 2- Iran University of Science and Technology

Keywords :

Artificial lumbar disc،Total disc replacement،Finite element analysis،Biomechanics،Prodisc-L،Von mises stress

Abstract :

Degenerative disc disease (DDD) frequently affects the L3–L4 segment and may be treated with total disc replacement (TDR). We built a patient‑specific L3–L4 finite element model to evaluate ProDisc‑L endplates made from Ti‑6Al‑4V, CFR‑PEEK, or CoCrMo paired with an ultra‑high‑molecular‑weight polyethylene (UHMWPE-GUR 1020, 75 kGy) core. Under 150 N preload and 10 N·m flexion, extension, right lateral bending, and left axial rotation, we computed von Mises stresses in bone, plates, and core. Compared to the standard CoCrMo-UHMWPE configuration, the Ti-6Al-4V endplate with UHMWPE-GUR RM core reduced endplate stress by up to 6% for example from 46.64 MPa to 43.97 MPa in bending and core stress by up to 54% for example from 31.94 MPa to 14.96 MPa in extension, while maintaining bone stress within acceptable limits. When compared to CFR-PEEK-UHMWPE GUR RM with Ti-6Al-4V-UHMWPE GUR RM decreased endplate stress by about 5% like 46.23 MPa to 43.97 MPa and core stress by approximately 27% by 17.85 MPa to 13.13 MPa in bending. These improvements indicate that the Ti-6Al-4V and UHMWPE-GUR RM combination more effectively minimizes stress concentrations, enhances load transfer, reduces wear and extends implant longevity. In conclusion, this configuration provides a biomechanically superior option for TDR that may improve long-term clinical outcomes and reduce the risk of revision surgeries for patients with DDD.