Larger diameter bearings reduce wear in metal-on-metal hip implants

S. Affatato, W. Leardini, A. Jedenmalm, O. Ruggeri, A. Toni

Research output: Contribution to journalArticle

Abstract

Metal-on-metal hip arthroplasty has the longest clinical history of all total arthroplasties. We asked whether large diameter femoral heads would result in less wear than those with small diameters. We also asked if there is a threshold diameter that ensures good wear behavior. We tested three batches of cast high-carbon cobalt-chromium-molybdenum hip implants (28 mm, 36 mm, and 54 mm diameters) in a hip simulator for 5 million cycles. We used bovine serum as lubricant and weighed the samples at regular intervals during testing. The 28-mm configuration had almost twice the wear of the 54-mm configuration, but we observed no difference between the 36-mm and the 54-mm configurations. The similarity in the wear performances of the larger configurations supports the presence of a threshold diameter that ensures good wear behavior.

Original languageEnglish
Pages (from-to)153-158
Number of pages6
JournalClinical Orthopaedics and Related Research
Issue number456
DOIs
Publication statusPublished - 2007

Fingerprint

Hip
Metals
Arthroplasty
Lubricants
Molybdenum
Chromium
Thigh
Cobalt
Carbon
History
Serum

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine

Cite this

Larger diameter bearings reduce wear in metal-on-metal hip implants. / Affatato, S.; Leardini, W.; Jedenmalm, A.; Ruggeri, O.; Toni, A.

In: Clinical Orthopaedics and Related Research, No. 456, 2007, p. 153-158.

Research output: Contribution to journalArticle

Affatato, S. ; Leardini, W. ; Jedenmalm, A. ; Ruggeri, O. ; Toni, A. / Larger diameter bearings reduce wear in metal-on-metal hip implants. In: Clinical Orthopaedics and Related Research. 2007 ; No. 456. pp. 153-158.
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