Serial magnetic resonance imaging of metal-on-metal total hip replacements. Follow-up of a cohort of 28 mm Ultima TPS THRs

D Ebreo, P J Bell, H Arshad, S T Donell, A Toms, J F Nolan

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Metal artefact reduction (MAR) MRI is now widely considered to be the standard for imaging metal-on-metal (MoM) hip implants. The Medicines and Healthcare Products Regulatory Agency (MHRA) has recommended cross-sectional imaging for all patients with symptomatic MoM bearings. This paper describes the natural history of MoM disease in a 28 mm MoM total hip replacement (THR) using MAR MRI. Inclusion criteria were patients with MoM THRs who had not been revised and had at least two serial MAR MRI scans. All examinations were reported by an experienced observer and classified as A (normal), B (infection) or C1-C3 (mild, moderate, severe MoM-related abnormalities). Between 2002 and 2011 a total of 239 MRIs were performed on 80 patients (two to four scans per THR); 63 initial MRIs (61%) were normal. On subsequent MRIs, six initially normal scans (9.5%) showed progression to a disease state; 15 (15%) of 103 THRs with sequential scans demonstrated worsening disease on subsequent imaging. Most patients with a MoM THR who do not undergo early revision have normal MRI scans. Late progression (from normal to abnormal, or from mild to more severe MoM disease) is not common and takes place over several years.
Original languageEnglish
Pages (from-to)1035-1039
Number of pages5
JournalBone & Joint Journal
Volume95-B
Issue number8
DOIs
Publication statusPublished - Aug 2013

Keywords

  • Adult
  • Aged
  • Arthroplasty, Replacement, Hip
  • Artifacts
  • Cross-Sectional Studies
  • Disease Progression
  • Female
  • Follow-Up Studies
  • Hip Prosthesis
  • Humans
  • Magnetic Resonance Imaging
  • Male
  • Metal-on-Metal Joint Prostheses
  • Metals
  • Middle Aged
  • Prosthesis Design
  • Prosthesis Failure
  • Prosthesis-Related Infections
  • Reoperation

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