title: Pseudotumor Formation in a Metal-on-polyethylene Total Hip Arthroplasty Due to Trunnionosis at the Head-neck Taper.
abstract: We present here a case of pseudotumor formation likely due to metal wear debris generated at the head-neck taper (trunnion) of the femoral stem and head components in a metal-on-polyethylene (MOP) total hip arthroplasty. Over the last few years, this recently described diagnosis, trunnionosis, has been recognized and reported more frequently. This patient presented with a rather large (12-cm diameter) pseudotumor with accompanying loss of abductors and a pelvic discontinuity making reconstruction more challenging. We believe the psuedotumor in this patient developed from trunnionosis. This is an interesting case of aseptic lymphocyte-dominated vasculitis-associated lesions (ALVAL) in a MOP total hip arthroplasty.
authors.affiliation: OrthoArizona-Mezona Division, Gilbert, Arizona.
authors.forename: Jake T
authors.initials: JT
authors.lastname: Stahnke
authors.affiliation: OrthoArizona-Mezona Division, Gilbert, Arizona.
authors.forename: Kipling P
authors.initials: KP
authors.lastname: Sharpe
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D002857:Chromium / Q000009:adverse effects*; D003035:Cobalt / Q000009:adverse effects*; D020878:Device Removal; D005260:Female; D005684:Gait; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D007592:Joint Diseases / Q000209:etiology* / Q000601:surgery*; D011474:Prosthesis Design; D011475:Prosthesis Failure / Q000009:adverse effects*; D012086:Reoperation
chemical_list: D002857:Chromium; D003035:Cobalt