Highly cross-linked polyethylene: a review of recent advances
Background / Problem First-generation highly cross-linked polyethylene (XLPE) has demonstrated excellent long-term survivorship in total hip arthroplasty (THR) by significantly reducing wear and subsequent osteolysis compared to conventional polyethylene. As this material technology continues to evolve, a comprehensive understanding of recent advancements and their clinical implications is necessary for the practicing surgeon.
Objective of the Article This review synthesizes recent and original publications on the ongoing progress of XLPE. It examines new applications in monoblock and dual mobility components, the performance of second-generation antioxidant-stabilized materials, emerging manufacturing processes, and the translation of this technology to total knee arthroplasty (TKR).
Key Points / Core Message Third-generation vitamin E-stabilized XLPE used in uncemented monoblock cups shows promising mid-term results, with low wear rates comparable to modular designs. For dual mobility constructs, second-generation XLPE (sequentially annealed or vitamin E-infused) may be biomechanically superior due to better preservation of mechanical properties. At 10-year follow-up, vitamin E-stabilized XLPE liners in THR demonstrate significantly lower radiographic wear than first-generation XLPE, although this has not yet translated to a lower revision rate. Driven by a shortage of cobalt-60, chemical cross-linking with antioxidants is emerging as a viable alternative to gamma irradiation. In contrast to THR, current evidence from meta-analyses does not support the routine superiority of XLPE over conventional polyethylene in TKR. Rare XLPE failures underscore the importance of analyzing explants and maintaining meticulous surgical technique.
Conclusion / Implications for Practice While progress in polyethylene technology is encouraging, each formulation must be evaluated individually based on long-term data. XLPE is the standard of care for primary THR, but its routine use in primary TKR is not yet supported by robust evidence. Surgeons must remain vigilant regarding implant design and positioning, as technical precision is critical to success even with advanced biomaterials.
