Comparison of Two Hydroxyapatite-Coated Femoral Stems

Clinical function, bone mineral density (BMD), and radiographs of 80 randomly allocated, hydroxyapatite-coated femoral stems of two differing lengths were studied for 2 years. The short stem was optimized for proximal fixation. The predictive value of bone densitometry was also studied. After 2 year...

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Bibliographic Details
Published in:The Journal of arthroplasty 2006-04, Vol.21 (3), p.344-352
Main Authors: Sluimer, Judith C., Hoefnagels, Nicolette H.M., Emans, Pieter J., Kuijer, Roel, Geesink, Rudolph G.T.
Format: Article
Language:English
Subjects:
BMD
DEXA
hydroxyapatite
pain
proximal fixation
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Summary:Clinical function, bone mineral density (BMD), and radiographs of 80 randomly allocated, hydroxyapatite-coated femoral stems of two differing lengths were studied for 2 years. The short stem was optimized for proximal fixation. The predictive value of bone densitometry was also studied. After 2 years, significantly more bone apposition and a higher BMD percentage were observed in Gruen zone 7 of the short stem. We conclude that stem design can be enhanced to achieve more proximal fixation. However, we found a higher incidence of pain with the short stem, indicating a trade-off between increased proximal fixation and diminished overall mechanical stability. No strong correlations between clinical function and radiographic evaluation of remodeling were found with BMD, suggesting that dual-energy x-ray absorptiometry has no predictive value for short-term clinical outcome.
ISSN:0883-5403
1532-8406
DOI:10.1016/j.arth.2005.06.015