EXp Blended Antioxidant Technology
StelKast is the first U.S. orthopedic company to provide a highly cross-linked vitamin E blended antioxidant polyethylene, offering superior oxidation resistance in hip and knee implants.
EXp Polyethylene Technology represents an optimal blend of UHMWPE, the antioxidant vitamin E(α-tocopherol), and cross-linking for long-term oxidative stability, preservation of mechanical properties and performance.
- Unlike other highly cross-linked polyethylenes, EXp requires no thermal processing or infusion of antioxidants to stabilize the material.
- EXp liners experienced no failures as a result of dynamic impingement testing.
- The vitamin E blended into the EXp does not elude from the material during extraction studies.
- The morphology of EXp UHMWPE is consistent with conventional UHMWPE—demonstrating no consolidation defects or voids.
EXp UHMWPE is more resistant to oxidation than conventional cross-linked polyethylene
EXp UHMWPE remains resistant to oxidation after 5 million cycles of wear testing and artificial aging
Preserved Mechanical Performance3
EXp UHMWPE retained its mechanical performance after oxidative aging
EXp liners demonstrated a 30% reduction in wear against a 36mm BIOLOX®delta head compared to a 36mm cobalt-chrome head
References 1 through 7: Data on file at StelKast. Bench testing is not necessarily indicative of clinical performance.