Does ion release differ between hip resurfacing and metal-on-metal THA?

Antonio Moroni, Lucia Savarino, Matteo Cadossi, Nicola Baldini, Sandro Giannini

Research output: Contribution to journalArticlepeer-review


Modern metal-on-metal hip resurfacing was introduced as a bone-preserving method of joint reconstruction for young and active patients; however, the large diameter of the bearing surfaces is of concern for potential increased metal ion release. We hypothesized there were no differences in serum concentrations of chromium, cobalt, and molybdenum between patients who had metal-on-metal hip resurfacing (Group A; average head diameter, 48 mm; median followup, 24 months) and patients who had 28-mm metal-on-metal THA (Group B; median followup, 25 months). Serum concentrations also were compared with concentrations in healthy subjects. We identified no differences in ion levels between Groups A and B. A distinction was made according to gender. Women showed a higher chromium release in Group A whereas men had a higher cobalt release in Group B. Values obtained from Group A were higher than those of the control subjects. Our data suggest metal-on-metal bearings for THA should not be rejected because of concern regarding potential increased metal ion release; however, patients with elevated ion levels, even without loosening or toxicity, could be at higher risk and should be followed up periodically. Level of Evidence: Level III, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.

Original languageEnglish
Pages (from-to)700-707
Number of pages8
JournalClinical Orthopaedics and Related Research
Issue number3
Publication statusPublished - Mar 2008

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine


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