title: [Survey on the use and behaviour of metal-metal hip replacements in Spain].
abstract: BACKGROUND
  Following medical device alerts published in different countries of problems with metal-on-metal total hip replacements, the Spanish Agency of Medicines and Medical Devices (AEMPS) in collaboration with the Spanish Hip Society Surgery designed a national survey to gather information on the use and behaviour of these hip implants.
  
  
  METHODS
  The survey consisted of a questionnaire sent by e-mail to 283 clinical centre recipients of metal-on-metal hips to be filled in by surgeons with expertise in the field.
  
  
  RESULTS
  A total of 257 questionnaires were completed. The response rate of the clinical centres was 36.7%. A total of 97.7% of the responses reported that clinical and radiological follow-ups are carried out, and 79.6% undertook metal ion analyses (chromium and cobalt). A large majority (83.6%) of the responders who had who used surface implants, and 70% of those with large-head implants reported peri-operative complications. The most common complication was pain (25% with surface implants and 30.8% with large-head implants). Currently 80.8% of those responding were considering abandoning implanting of these hip replacements.
  
  
  CONCLUSIONS
  Despite the many limitations to this study, the survey has allowed us to obtain in a quick first view of the implant scenario of Metal on Metal hip implants in Spain, and to determine the type of patient implanted, the time of implantation, and the experience/expertise of the surgeons, and the type of follow-up carried out.
authors.affiliation: Departamento de Productos Sanitarios, Agencia Española de Medicamentos y Productos Sanitarios (AEMPS), Madrid, España. Electronic address: ncalcerrada@aemps.es.
authors.forename: N
authors.initials: N
authors.lastname: Calcerrada
authors.affiliation: Departamento de Productos Sanitarios, Agencia Española de Medicamentos y Productos Sanitarios (AEMPS), Madrid, España.
authors.forename: A
authors.initials: A
authors.lastname: Fernández-Vega
authors.affiliation: Departamento de Productos Sanitarios, Agencia Española de Medicamentos y Productos Sanitarios (AEMPS), Madrid, España.
authors.forename: C
authors.initials: C
authors.lastname: Valls-León
authors.affiliation: Servicio de Cirugía Ortopédica y Traumatología, Hospital La Paz, Madrid, España.
authors.forename: E
authors.initials: E
authors.lastname: Garcia-Cimbrelo
mesh_terms: D000328:Adult; D000359:Aftercare / Q000379:methods / Q000706:statistics & numerical data; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D005260:Female; D019538:Health Care Surveys; D006622:Hip Prosthesis / Q000009:adverse effects / Q000706:statistics & numerical data; D006801:Humans; D008297:Male; D061825:Metal-on-Metal Joint Prostheses / Q000009:adverse effects / Q000706:statistics & numerical data; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D011183:Postoperative Complications / Q000453:epidemiology; D010818:Practice Patterns, Physicians' / Q000706:statistics & numerical data*; D011474:Prosthesis Design; D011475:Prosthesis Failure; D013030:Spain
keywords: Artroplastias de superficie de cadera; Hip surface replacement; Metal-metal prosthesis; Metal-on-metal bearings; Pares de fricción metal-metal; Prótesis metal-metal; Prótesis total de cadera; Total hip arthroplasty