Comparative in vivo evaluation of porous and dense duplex titanium and hydroxyapatite coating with high roughnesses in different implantation environments

J Biomed Mater Res A. 2009 May;89(2):550-60. doi: 10.1002/jbm.a.31995.

Abstract

Ti (PG60) and Ti plus HA (HPG60) dense coatings with ultrahigh roughness (Ra: 74 +/- 8 microm and 53 +/- 18 microm, respectively) were compared to high Ti (Ti60) and Ti plus HA (HT60) high roughened porous coatings (Ra: 40 +/- 7 microm and 36 +/- 3 microm, respectively). Surfaces were implanted in cortical and trabecular bone of young adult (YOUNG), aged (AGED) and estrogen-deficient sheep (OVX) and analyzed by means of histology, histomorphometry and push-out tests 3 months after implantation. A significantly lower value in affinity index (AI) of PG60 when compared to TI60 (p < 0.01) was observed in cortical bone. In trabecular bone, lower values in AI were found in TI60 and PG60 when compared to their HA-coated surfaces (p < 0.0005). Bone ingrowth (BI) of TI60 and PG60 was significantly lower than that of the HA-coated surfaces in trabecular bone (p < 0.05). Significantly lower values in BI in OVX sheep in comparison to YOUNG sheep in both cortical and trabecular bone were observed (p < 0.05). Data showed that high roughness and Ti and HA-coated surfaces are suitable for aged and osteoporotic patients. HA coatings represent the most successful strategy in trabecular bone.

Publication types

  • Comparative Study

MeSH terms

  • Animals
  • Biomechanical Phenomena
  • Bone Density / drug effects
  • Coated Materials, Biocompatible / pharmacology*
  • Durapatite / pharmacology*
  • Femur Neck / diagnostic imaging
  • Femur Neck / drug effects
  • Materials Testing*
  • Ovariectomy
  • Porosity / drug effects
  • Prosthesis Implantation*
  • Radiography
  • Sheep
  • Surface Properties / drug effects
  • Titanium / pharmacology*

Substances

  • Coated Materials, Biocompatible
  • Durapatite
  • Titanium