Load transfer through a hydroxyapatite-coated canine hip implant

Journal of Applied Biomaterials : an Official Journal of the Society for Biomaterials
J A SzivekJ T Ruth

Abstract

Strain transfer near hydroxyapatite (HA) coated canine hip implants was examined using simulated anatomical loading based on in vivo strain measurements. Strain changes near implants relative to intact control values were in excess of 100% for transverse and principal strains for zero time period (immediate postimplant) specimens. They were generally smaller (100% or less) for axial, transverse, and principal minimums in the same locations for 4 months postimplantation specimens. Cortical bone loss occurred in all implanted femora. The most extensive loss, up to 47%, occurred adjacent to the proximal section of the implant. Extensive trabecular bone formation, over 300% in some regions of each femur, was noted in all implanted femora. Backscattered electron imaging along the HA-coated sections of the implants showed extensive bone bonded to the coating. NOrmal light and UV light micrographs showed direct bone apposition to the implant surfaces and extensive bone formation in all test animals. Microscopy revealed no evidence of any soft tissue layer between the implant and bone. Bone was typically found in direct contact with the implant surface. Histomorphometry indicated that bone formation rates in the implanted femora were e...Continue Reading

References

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Citations

Feb 20, 1999·Veterinary Surgery : VS·M A FlückigerH Binder
Jan 1, 1997·Acta Oncologica·M LindgrenR Henriksson
Dec 1, 1995·British Journal of Haematology·T Lavabre-BertrandJ Brochier
Feb 24, 1999·Journal of Biomedical Materials Research·G A BattrawP L Anderson

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Journal of Applied Biomaterials : an Official Journal of the Society for Biomaterials
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