'Asymptomatic' pseudotumors after metal-on-metal hip resurfacing arthroplasty: prevalence and metal ion study

Y. M. Kwon, S. J. Ostlere, P. McLardy-Smith, N. A. Athanasou, H. S. Gill, D. W. Murray

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Abstract

Symptomatic abnormal periprosthetic soft-tissue reactions ("pseudotumors") have been reported after metal-on-metal hip resurfacing arthroplasty (MoMHRA). The aims of this study were (1) to determine the prevalence of asymptomatic pseudotumors after MoMHRA and (2) to measure metal ion levels in these patients. A total of 201 hips in 158 patients were evaluated at a mean follow-up of 61 months (range, 36-88) using ultrasound/magnetic resonance imaging and serum/hip aspirate cobalt and chromium measurements. Pseudotumors found in 7 patients (4%) were associated with significantly higher cobalt and chromium levels and inferior functional scores. Elevated levels of cobalt and chromium ions suggest that pseudotumors are associated with increased wear generated from metal-on-metal articulations. Clinicians need to be aware of pseudotumors as a differential diagnosis during clinical evaluation of MoMHRA patients, and further imaging such as ultrasound or magnetic resonance imaging is recommended to confirm the diagnosis.
Original languageEnglish
Pages (from-to)511-518
Number of pages8
JournalJournal of Arthroplasty
Volume26
Issue number4
DOIs
Publication statusPublished - 2011

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Arthroplasty
Hip
Metals
Ions
Chromium
Cobalt
Magnetic Resonance Imaging
Differential Diagnosis
Serum

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'Asymptomatic' pseudotumors after metal-on-metal hip resurfacing arthroplasty: prevalence and metal ion study. / Kwon, Y. M.; Ostlere, S. J.; McLardy-Smith, P.; Athanasou, N. A.; Gill, H. S.; Murray, D. W.

In: Journal of Arthroplasty, Vol. 26, No. 4, 2011, p. 511-518.

Research output: Contribution to journalArticle

Kwon, Y. M. ; Ostlere, S. J. ; McLardy-Smith, P. ; Athanasou, N. A. ; Gill, H. S. ; Murray, D. W. / 'Asymptomatic' pseudotumors after metal-on-metal hip resurfacing arthroplasty: prevalence and metal ion study. In: Journal of Arthroplasty. 2011 ; Vol. 26, No. 4. pp. 511-518.
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