Journal
JOURNAL OF ARTHROPLASTY
Volume 17, Issue 3, Pages 304-311Publisher
CHURCHILL LIVINGSTONE INC MEDICAL PUBLISHERS
DOI: 10.1054/arth.2002.30410
Keywords
bone; ongrowth; hydroxyapatite (HA); push-out; uncemented
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This study examined the role of substrate preparation and hydroxyapatite (HA) coating thickness on bone ongrowth and shear strength in a bilateral bicortical sheep model. Plasma-sprayed and grit-blasted titanium implants with different thickness HA coatings were examined at 4, 8, 12, and 26 weeks after implantation. Shear strength increased with time for all implants. Plasma-sprayed implants were superior to grit-blasted implants at all time points. The 100-mum-thick HA layer used in the present study provided greater fixation and ongrowth and less resorption compared with the 50-mum-thick layer. We did not observe any advantage ill using a thicker HA coating for the titanium substrates examined.
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