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International Orthopaedics logoLink to International Orthopaedics
. 2004 Apr 29;28(4):206–210. doi: 10.1007/s00264-004-0558-x

Comparison of wear and osteolysis in hip replacement using two different coatings of the femoral stem

Joaquin Sanchez-Sotelo 1, David G Lewallen 1, William Scott Harmsen 2, Jeffrey Harrington 2, Miguel E Cabanela 1,
PMCID: PMC3456935  PMID: 15118841

Abstract

We compared the clinical and radiographic results of two matched series of total hip arthroplasties, one with hydroxyapatite-coated femoral stems, the other with a similar but porous-coated femoral stem. The prevalence of radiographic osteolysis was 16% in hips with hydroxyapatite-coated stems and 43% in hips with porous-coated femoral stems. In hips with hydroxyapatite-coated stems, osteolysis was always limited to Gruen zones 1 and 7. In contrast, distal osteolysis was present around 26% of the porous-coated stems. At 7 years, the survival-free rate of distal osteolysis was 100% in hips with hydroxyapatite-coated stems but 90% in hips with porous-coated stems (p=0.04). Circumferential hydroxyapatite coating of the femoral component reduced the occurrence of osteolysis and eliminated distal osteolysis at 5–10 years of follow-up. In addition, hydroxyapatite coating did not alter the wear rate.

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