Journal of Bone and Joint Surgery
A benign psoas mass following metal-on-metal resurfacing of the hip
Lymphocytic perivascular infiltration may be seen around metal-on-metal joint replacements, more extensive around prostheses with aseptic loosening than in well fixed components.3 This may be part of a novel, clinically significant and immunologically mediated mode of failure secondary to high concentrations of nanometre-sized metal debris. We describe a patient who developed a benign psoas mass secondary to wear particles from a metal-on-metal resurfacing arthroplasty. Excision of the mass was required and subsequently a revision procedure.