An investigation of the effects of hydroxyapatite coatings on the fixation strength of cortical screws

Hydroxyapatite (HA) are commonly applied to orthopaedic implants for acceleration of osteointegration and so overcoming the loosening problems such as in cortical screws. Electrophoretic deposition (EPD) of hydroxyapatite was applied for coating of cortical screws in this work. The effects of hydrox...

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Bibliographic Details
Published in:Medical engineering & physics 2005-04, Vol.27 (3), p.221-228
Main Authors: Yildirim, O.S., Aksakal, B., Celik, H., Vangolu, Y., Okur, A.
Format: Article
Language:English
Subjects:
Animals
Bone Screws
Coated Materials, Biocompatible - chemistry
Cortical screw
Durapatite - analysis
Durapatite - chemistry
Electroplating - methods
EPD method
Equipment Failure Analysis
Femur - pathology
Femur - physiopathology
Femur - surgery
Fixation
Hydroxyapatite coating
Materials Testing
Osseointegration - physiology
Prosthesis Failure
Sheep
Stainless Steel - chemistry
Surface Properties
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Summary:Hydroxyapatite (HA) are commonly applied to orthopaedic implants for acceleration of osteointegration and so overcoming the loosening problems such as in cortical screws. Electrophoretic deposition (EPD) of hydroxyapatite was applied for coating of cortical screws in this work. The effects of hydroxyapatite-coated and uncoated cortical screws on insertion and extraction torque were investigated through in vivo experiments. Three groups of screws were undertaken: first group with no coating, second group coated with HA and the third group coated with HA + interlayer, a synthetic calcium silicate compound. Five sheep were operated, and 60 cortical (20 × 3) screws from those of groups were implanted in cortical femurs to observe the effect of HA and interlayer on screws. Results show that as an alternative to plasma spray coating method, the EPD process enables to produce a quick, easy, cheap and uniform adjustable coating layer. Also from biomechanical and SEM examinations, HA coating by EPD method of cortical screws resulted in extremely improved fixation with reduced risk of loosening problem.
ISSN:1350-4533
1873-4030
DOI:10.1016/j.medengphy.2004.10.006