"Oxidation continues to be a concern for surgeons. Over time, wear of conventional polyethylene can generate debris in the joint, triggering local inflammation that results in bone loss which is one of the biggest causes of late-term failure in hip and knee replacements," said Calvin Lin, president of United Orthopedic Corporation USA. "Clearance of our E-XPE, a vitamin E highly cross-linked polyethylene, provides surgeons with an alternative implant for their patient. Our vertically integrated manufacturing process affords us the flexibility to design, manufacture and distribute implants or instruments that address many of the most significant needs in the orthopedic industry."
Vitamin E is an effective biological antioxidant which helps prevent the oxidative degradation of cell membrane phospholipids. When added to ultra-high molecular weight polyethylene (UHMWPE), vitamin E performs a similar role by helping to prevent oxidation of the polyethylene chains.1 Vitamin E -stabilized UHMWPE is a biocompatible material with good mechanical, wear, and oxidative proprieties. Results from accelerated aging tests show that E-XPE inserts and liners exhibited a 60 percent and 75 percent reduction, respectively, in gravimetric wear2. E-XPE material provides greater strength in comparison to re-melted highly crosslinked polyethylene while maintaining oxidation resistance as demonstrated in mechanical tests.
An estimated 4.7 million Americans have undergone total knee arthroplasty (TKA) and 2.5 million have undergone total hip arthroplasty (THA).The prevalence of THA rises to nearly 6 percent by 80 years of age. The prevalence of TKA rises to nearly 10 percent by 80 years of age.3
1 Gigante A, Bottegoni C, Ragone V, Banci L. Effectiveness of Vitamin-E-Doped Polyethylene in Joint Replacement: A Literature Review. J Funct Biomater 2015; 6(3):889-900.
2 Chang TW, Cheng YW, Lu CK, Liau JJ. Is Highly Cross Linked UHMWPE Blended with Vitamin E a Viable Reduction Wear in TKA? Presented at Orthopaedic Research Society, 2017, San Diego, CA.
3 Maradit Kremers H, Larson DR, Crowson CS, Kremers WK, Washington RE, Steiner CA et al. Prevalence of Total Hip and Knee Replacement in the United States. J Bone Joint Surg Am 2015; 97(17):1386-97.