Tibial implants: Biomechanical and histomorphometric studies of hydroxyapatite-coated and uncoated stainless steel and titanium screws in long-term ovariectomized sheep

M. Rocca, M. Fini, G. Giavaresi, N. Nicoli Aldini, R. Giardino

Research output: Contribution to journalArticle

Abstract

This study was designed to evaluate osteointegration of HA-coated and uncoated titanium and stainless steel screws in the cortical bone of long-term (24 months) ovariectomized sheep (OVX group), in comparison with Sham-aged sheep (control group). The screws were tested biomechanically (extraction torque) and histomorphometrically (affinity index: AI) 12 weeks after their implantation in tibial diaphyses. Tibial cortical bone parameters showed significant differences between the groups, showing a reduction of the selected parameters in the OVX group. ANOVA showed significant effects for both material and ovariectomy factors on obtained extraction torque (material: F=159.26, p <0.0005; ovariectomy: F=20.04, p <0.0005) and AI data (material: F=8.04, p <0.001; ovariectomy: F=7.17, p <0.05). In both groups the extraction torque for coated screws of both materials was significantly higher than for uncoated screws, and uncoated titanium had a better extraction torque than uncoated stainless steel. In the OVX group, the HA-coated stainless steel and titanium AI data were significantly higher than uncoated AI data. In conclusion, the biomechanical and histomorphological results obtained suggest employing HA-coated screws in the presence of osteopenic cortical bone.

Original languageEnglish
Pages (from-to)649-654
Number of pages6
JournalInternational Journal of Artificial Organs
Volume24
Issue number9
Publication statusPublished - 2001

Keywords

  • Hydroxyapatite
  • Osteopenia
  • Sheep
  • Stainless steel
  • Titanium

ASJC Scopus subject areas

  • Biophysics

Fingerprint Dive into the research topics of 'Tibial implants: Biomechanical and histomorphometric studies of hydroxyapatite-coated and uncoated stainless steel and titanium screws in long-term ovariectomized sheep'. Together they form a unique fingerprint.

  • Cite this