According to the literature, the development of metallosis after hip arthroplasty occurs in approximately 5% of patients. Metallic debris in the joint results in massive local and systemic release of cytokines. Excision of the pelvic pseudotumor, as well as revision surgery, is mandatory if there is evidence of osteolysis and loosening of the endoprosthesis. Imaging diagnostics, including magnetic resonance and computed tomography, are crucial for the preoperative planning of surgical intervention