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Clin Orthop Relat Res. 2009 Jan;467(1):101-11. doi: 10.1007/s11999-008-0540-9. Epub 2008 Oct 15.

2008 John Charnley award: metal ion levels after metal-on-metal total hip arthroplasty: a randomized trial.

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1
Anderson Orthopaedic Research Institute, Alexandria, VA 22307, USA.

Abstract

Metal-on-metal bearing total hip arthroplasty is performed more commonly than in the past. There may be manufacturing differences such as clearance, roughness, metallurgy, and head size that affect performance. In a prospective, randomized trial, we compared 2-year postoperative ion levels for a 28-mm metal-on-polyethylene bearing with 28-mm and 36-mm metal-on-metal bearings. We measured serum, erythrocyte, and urine ion levels. We observed no difference in the ion levels for the 28-mm and 36-mm metal-on-metal bearings. The ion levels in these patients were lower than reported for most other metal-on-metal bearings. Although both erythrocyte and serum cobalt increased, erythrocyte chromium and erythrocyte titanium did not increase despite a four- to sixfold serum chromium and a three- to fourfold serum titanium increase. This may represent a threshold level for serum chromium and serum titanium below which erythrocytes are not affected.

LEVEL OF EVIDENCE:

Level I, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.

PMID:
18855089
PMCID:
PMC2600985
DOI:
10.1007/s11999-008-0540-9
[Indexed for MEDLINE]
Free PMC Article
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