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With the introduction of second generation metal-on-metal (MM) hip implants in the mid-1990s, increased interest has arisen regarding the local biological effects of metal wear particles and ions on soft tissues, which have been grouped under the term adverse reactions to metal debris (ARMD). When these reactions constitute a soft tissue mass, they are usually referred to as a pseudotumor .
Histological studies of these masses have shown the presence of features characteristic of a non-specific inflammatory reaction (macrophages and wear particles) but also the presence of perivascular infiltrates of lymphocytes that are suggestive of a hypersensitivity reaction [3, 7, 13].
The first description of a hip implant-related pseudotumor was made in 1988 with a metal-on-polyethylene (MPE) bearing. The mass was attributed to a local response to metal ion release from corrosion at the Morse taper head-neck junction . In 2008, a report of a multisurgeon experience with MM hip ....
HSS Journal, an academic peer-reviewed journal published three times a year, February, July and October. The Journal accepts and publishes peer reviewed articles from around the world that contribute to the advancement of the knowledge of musculoskeletal diseases and disorders.