title: Head-neck taper corrosion following total hip arthroplasty with Stryker Meridian stem.
abstract: BACKGROUND
  Taper corrosion at the modular junctions of total hip arthroplasty (THA) femoral stems are known to cause locally destructive adverse local tissue reaction (ALTR). However, the implants at risk remain to be fully elucidated.
  
  
  METHODS
  We report the case of a 76-year-old woman with hip pain, abductor weakness, and sciatic nerve symptoms 2 years following metal-on-polyethylene THA. Serum cobalt levels were elevated, while chromium levels were normal. Magnetic resonance imaging demonstrated ALTR. The patient's symptoms resolved following head and liner exchange with ceramic head and titanium sleeve.
  
  
  METHODS
  Previous studies have reported ALTR secondary to head-neck taper corrosion in cobalt chrome alloy and titanium alloy stems used in metal-on-polyethylene (MoP) THA. The stems described above span 4 manufacturers with varying taper geometries. To our knowledge, this is the first report of ALTR due to head-neck taper corrosion in a Stryker Meridian titanium-molybdenum-zirconium-iron (TMZF) alloy stem.
  
  
  CONCLUSIONS
  Close surveillance for ALTR may be considered in patients with this prosthesis. Further investigation of the TMZF alloy and V40 taper geometry of this stem may guide future implant design.
authors: Tufts University School of Medicine, Boston - USA.
authors: Sonika
authors: S
authors: Patel
authors: New England Baptist Hospital, Boston - USA.
authors: Carl T
authors: CT
authors: Talmo
authors: Department of Orthopaedic Surgery, The University of Toledo College of Medicine and Life Sciences, Toledo - USA.
authors: Sumon
authors: S
authors: Nandi
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects* / Q000295:instrumentation*; D003343:Corrosion; D005260:Female; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D007592:Joint Diseases / Q000175:diagnosis / Q000209:etiology / Q000601:surgery*; D011183:Postoperative Complications / Q000175:diagnosis* / Q000209:etiology / Q000628:therapy; D011474:Prosthesis Design / Q000009:adverse effects; D011475:Prosthesis Failure / Q000009:adverse effects*; D012086:Reoperation