One of the main concerns in the orthopaedic community today is the generation of UHMWPE wear debris causing aseptic loosening and osteolysis in total hip arthroplasties. Consequently, there is a growing interest among researchers in this area to explore the use of alternate bearing surfaces in hip implants (1). The performance of total hip replacements can possibly be improved by using metal-on-metal articulating surfaces as is supported by the clinical findings (2). Proper characterization of the prosthetic implants with metal-on-metal bearing surfaces necessitates appropriate material screening and examination of the wear properties of the material in use (3,4).

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