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E-MAX Highly Crosslinked Polyethylene

Knee Product Group

E-MAX Highly Crosslinked Polyethylene (XLPE) for knee bearings builds on the successes of first generation XLPE by incorporating two innovative technologies: Vitamin E and mechanical annealing.

A200 Knee System with E-MAX Highly Crosslinked Polyethylene Tibial Insert and Patella

  • Vitamin E is added to hinder in vivo oxidation, which can cause degradation of the polymer material. [1,2]
  • Mechanically annealing—as opposed to melting—helps maintain mechanical properties. [3,4,5]

Thus, E-MAX Highly Crosslinked Polyethylene provides excellent wear properties [6], like first generation XLPE, plus oxidative stability and the improved mechanical properties needed in knee applications.

  1. Wannomae KK, Micheli BR, Lozynsky AJ, Muratoglu OK. A New Method of Stabilizing Irradiated UHMWPE Using Vitamin E and Mechanical Annealing. 11th Congress EFFORT. Madrid, Spain. June 2010.
  2. Costa L, Bracco P. Chapter 21 Mechanisms of crosslinking, oxidative degradation, and stabilization of UHMWPE. In UHMWPE Biomaterials Handbook Second Edition (ed. Kurtz SM). Elsevier: Amsterdam, 2009.
  3. Bhattacharyya S, Matrisciano L, Spiegelberg S, Harris W, Muratoglu O. Mechanical elimination of residual free radicals in an irradiated UHMWPE rod: advantages over melting. 50th annual meeting of the orthopaedic research society. 2004:1474.
  4. Gomez-Barrena E, Medel F, Puertolas JA. Polyethylene oxidation in total hip arthroplasty: evolution and new advances. The Open Orthopedics Journal 2009; 3:115-120.
  5. Materials Characterization testing. Test report TP0322.  On file with KYOCERA Medical Technologies, Inc.
  6. University of Nebraska Medical Center. Characterization of CIMA and E-CIMA UHMWPE as a bearing against CoCr femoral hip components: A hip simulation study. Test report dated July 15, 2011. On file with KYOCERA Medical Technologies, Inc.