Abstract:
:This study was undertaken to investigate the relative importance of a hydroxyapatite (HA) coating and the macrotexture of titanium implants to the quality of bony ingrowth and fixation. Various types of titanium cylinders were implanted into the cancellous bone of the intercondylar region of the distal femur of the dog. The animals were sacrificed at intervals post-implantation and the implants were evaluated histologically for amount of bony ingrowth and mechanically by the means of a push-out test. Our results demonstrated that when grooved titanium implants are used, the addition of HA coating significantly improved the biologic fixation. In addition, a groove depth of 1 mm was found to give significantly better fixation than 2 mm. When compared to implants with traditional, beads-coated porous surfaces, HA-coated grooved titanium implants were found to show better fixation at 4 weeks after implantation, but, significantly inferior fixation at 12 weeks after implantation. We concluded that while a groove depth of 1 mm was optimal in HA-coated, grooved titanium implants, they remain inferior to beads-coated titanium implants with respect to longer-term fixation. More research needs to be addressed at improving the macrotexture environment of grooved implants to enhance long-term bony ingrowth.
journal_name
Biomaterialsjournal_title
Biomaterialsauthors
Hayashi K,Mashima T,Uenoyama Kdoi
10.1016/s0142-9612(98)00011-8keywords:
subject
Has Abstractpub_date
1999-01-01 00:00:00pages
111-9issue
2eissn
0142-9612issn
1878-5905pii
S0142-9612(98)00011-8journal_volume
20pub_type
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