Highly cross-linked ultrahigh molecular weight polyethylene with improved fatigue resistance for total joint arthroplasty: recipient of the 2006 Hap Paul Award.
Eliminating postirradiation melting and stabilizing the residual free radicals of radiation cross-linked ultrahigh molecular weight polyethylene (UHMWPE) with vitamin E resulted in improved fatigue crack propagation resistance without compromising wear resistance. We designed a cantilever postbending test to determine the bending fatigue resistance of alpha-tocopherol-doped, irradiated UHMWPE (alpha-TPE) in comparison to conventional UHMWPE. The bending fatigue behavior of alpha-TPE was comparable to conventional UHMWPE. Upon accelerated aging, the fatigue resistance of alpha-TPE was substantially better than that of conventional UHMWPE. alpha-TPE has shown improved wear and oxidation resistance, migration stability of vitamin E, and improved mechanical properties. The use of this material may be beneficial in total knee arthroplasty where its improved fatigue properties may be an advantage under high stresses.
Department of Orthopaedic Surgery, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114, USA.
Ebru
E
Oral
Arnaz S
AS
Malhi
Keith K
KK
Wannomae
Orhun K
OK
Muratoglu
D001672:Biocompatible Materials; D001696:Biomechanical Phenomena; D008422:Materials Testing; D011095:Polyethylenes; D011475:Prosthesis Failure; D024502:alpha-Tocopherol
D001672:Biocompatible Materials; D011095:Polyethylenes; C111601:ultra-high molecular weight polyethylene; D024502:alpha-Tocopherol