Highly cross linked polyethylene (XLPE) and other advances in tribology are better options. As in hip, there may be benefit of adding antioxidant rich surfaces like ( vit E) to improve longevity of implant.

But apart from manufacturing improvement, surgical factors also contribute to longevity by decreasing cyclic abnormal stresses. Good alignment, proper soft tissue tension, better compliance to postoperative instruction, ideal body weight, optimal bone health etc are some of patient and surgery related factors with equal bearing on outcome and inplant survival.

you can improve the wear resistance of UHMWPE in knee joint replacement by adding any metal nanotubes.