Soft tissue complications following hip arthroplasty may occur either in cases of
total hip arthroplasty or in hip resurfacing, a technique that has become popular in
cases involving young patients. Both orthopedic and radiological literatures are now
calling attention to these symptomatic periprosthetic soft tissue masses called
inflammatory pseudotumors or aseptic lymphocytic vasculites-associated lesions.
Pseudotumors are associated with pain, instability, neuropathy, and premature
loosening of prosthetic components, frequently requiring early and difficult
reoperation. Magnetic resonance imaging plays a relevant role in the evaluation of
soft tissue changes in the painful hip after arthroplasty, ranging from early
periprosthetic fluid collections to necrosis and more extensive tissue damage.
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