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UHMWPE for arthroplasty: past or future?
Elena Maria Brach Del Prever1, Alessandro Bistolfi, Pierangiola Bracco
1Dipartimento di Traumatologia, Ortopedia e Medicina del Lavoro dell'Università degli Studi di Torino, Centro Traumatologico Ortopedico, Via Zuretti 29, 10126, Torino, Italy, elena.brach@unito.it.
Summary
Ultra-high molecular weight polyethylene (UHMWPE) wear debris causes joint replacement failure. Newer crosslinked and vitamin E-stabilized UHMWPE offer improved wear resistance and oxidation prevention, aiding surgeon selection for better patient outcomes.
Area of Science:
- Biomaterials Science
- Orthopaedic Surgery
- Polymer Chemistry
Background:
- Wear debris from ultra-high molecular weight polyethylene (UHMWPE) is the primary cause of joint replacement failure.
- Degradative oxidation, induced by sterilization irradiation and oxygen, compromises UHMWPE's wear resistance and mechanical integrity.
- Historical issues include oxidation, sterilization methods, and storage, necessitating improved material solutions.
Purpose of the Study:
- To review historical and emerging strategies for addressing UHMWPE degradation in joint replacements.
- To guide orthopaedic surgeons in selecting appropriate polyethylene inserts and informing patients.
- To discuss advancements like crosslinking and antioxidant stabilization for enhanced implant longevity.
Main Methods:
- Literature review of UHMWPE properties, degradation mechanisms, and sterilization effects.
- Analysis of crosslinking technologies and their impact on material properties and clinical performance.
- Evaluation of antioxidant stabilization, specifically vitamin E (alpha-tocopherol), in UHMWPE.
Main Results:
- Gas sterilization (EtO, gas plasma) effectively eliminates oxidation, unlike irradiation in air.
- Crosslinked UHMWPE demonstrates superior wear resistance but may have reduced mechanical properties post-treatment.
- Mid-term clinical results for crosslinked acetabular cups are positive, with encouraging early knee replacement data.
Conclusions:
- Manufacturing processes significantly influence the clinical lifespan of UHMWPE implants.
- Crosslinked UHMWPE offers improved wear performance, with vitamin E emerging as a promising antioxidant for both crosslinked and non-crosslinked variants.
- Informed selection of UHMWPE materials and understanding their processing is crucial for successful joint replacement outcomes.
