| A biomechanical and histological analysis of standard versus hydroxyapatite-coated pins for external fixation. | |
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MedLine Citation:
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PMID: 18286593 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This sheep study was designed to make a comparative evaluation of two external fixation pin types each with and without hydroxyapatite (HA) coating. The two pins had different taper, pitch, and self drilling capabilities. Twenty Orthofix standard, self-tapping pins (group A), 20 Orthofix HA-coated, self-tapping pins (group B), 20 X-caliber, self-drilling, self-tapping pins (group C), and 20 X-caliber HA-coated, self-drilling, self-tapping pins (group D) were selected. Four pins were implanted in the right femurs of 20 adult sheep that were euthanized at 6 weeks. Mean pin insertion torque was 2745 +/- 822 Nmm in group A, 2726 +/- 784 Nmm in group B, 2818 +/- 552 Nmm in group C, and 2657 +/- 732 Nmm in group D (ns). Mean pin extraction torque was 1567 +/- 541 Nmm in group A, 2524 +/- 838 Nmm in group B, 1650 +/- 650 Nmm in group C, and 2517 +/- 726 Nmm in group D. HA-coated pins (group B and D) had a significantly greater mean pin extraction torque compared to similar uncoated pins (group A and C) (p < 0.0005). Histological analysis showed good osteointegration of the two coated pin types. This study shows that HA-coating is more important for optimal pin fixation than the particular combination of design parameters used in each pin type. |
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Authors:
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Antonio Moroni; Matteo Cadossi; Matteo Romagnoli; Cesare Faldini; Sandro Giannini |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of biomedical materials research. Part B, Applied biomaterials Volume: 86 ISSN: 1552-4981 ISO Abbreviation: J. Biomed. Mater. Res. Part B Appl. Biomater. Publication Date: 2008 Aug |
Date Detail:
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Created Date: 2008-07-16 Completed Date: 2008-09-17 Revised Date: 2011-09-26 |
Medline Journal Info:
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Nlm Unique ID: 101234238 Medline TA: J Biomed Mater Res B Appl Biomater Country: United States |
Other Details:
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Languages: eng Pagination: 417-21 Citation Subset: IM |
Copyright Information:
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(c) 2007 Wiley Periodicals, Inc. |
Affiliation:
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Rizzoli Orthopaedic Institute, University of Bologna, Bologna, Italy. a.moroni@ior.it |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Biomechanics Bone Nails* Coated Materials, Biocompatible / chemistry* Durapatite* Equipment Design External Fixators* Femur / surgery Materials Testing Sheep |
| Chemical | |
Reg. No./Substance:
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0/Coated Materials, Biocompatible; 1306-06-5/Durapatite |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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