title: 'Pseudotumour' invading the proximal femur with normal metal ions following metal on metal hip resurfacing.
abstract: A 75-year-old woman who had undergone hybrid metal-on-metal hip resurfacing 8 years earlier underwent revision arthroplasty because of hip, groin and lateral thigh pain. The main differential was aseptic loosening; however, serum cobalt and chromium levels were normal. Multiple imaging modalities revealed a periprosthetic, cystic soft tissue mass adjacent to the proximal femur. A large 'pseudotumour' with proximal femoral invasion was found at revision arthroplasty. We report the first finding of a 'pseudotumour' invading the proximal femur with normal metal ions following metal on metal hip resurfacing.
authors: Department of Trauma and Orthopaedics, Hillingdon Hospital, Uxbridge, Middlesex, UK.
authors: Harry
authors: H
authors: Krishnan
authors: Department of Trauma and Orthopaedics, Hillingdon Hospital, Uxbridge, Middlesex, UK.
authors: Kapil
authors: K
authors: Sugand
authors: Department of Trauma and Orthopaedics, Hillingdon Hospital, Uxbridge, Middlesex, UK.
authors: Ibrahim
authors: I
authors: Ali
authors: Department of Trauma and Orthopaedics, Hillingdon Hospital, Uxbridge, Middlesex, UK.
authors: Jay
authors: J
authors: Smith
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D001847:Bone Diseases / Q000209:etiology*; D002857:Chromium / Q000009:adverse effects; D003035:Cobalt / Q000009:adverse effects; D005260:Female; D005269:Femur; D006104:Granuloma, Plasma Cell / Q000175:diagnosis / Q000209:etiology*; D006801:Humans; D008279:Magnetic Resonance Imaging
chemical_list: D002857:Chromium; D003035:Cobalt