Stainless steel has been used as an orthopaedic implant material for some years. A number of in vivo hip prostheses have been found to fail by fatigue and this paper attempts to investigate the extent to which certain adverse factors of stainless steel implants, made from En58J, could contribute to a poor fatigue life, and whether molybdenum ion-platings could offset such poor performance. Stainless steel in the sensitized condition, and known surface condition, when ion-plated with molybdenum was found to give an improved fatigue life when tested in Ringer's solution.
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