A biomechanical and histological analysis of standard versus hydroxyapatite‐coated pins for external fixation
- 19 February 2008
- journal article
- research article
- Published by Wiley in Journal of Biomedical Materials Research Part B: Applied Biomaterials
- Vol. 86B (2), 417-421
- https://doi.org/10.1002/jbm.b.31036
Abstract
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. © 2008 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2008Keywords
This publication has 23 references indexed in Scilit:
- Hydroxyapatite-coated external-fixation pinsThe Journal of Bone and Joint Surgery. British volume, 2004
- HYDROXYAPATITE COATING OF EXTERNAL FIXATION PINS TO DECREASE AXIAL DEFORMITY DURING TIBIAL LENGTHENING FOR SHORT STATUREThe Journal of Bone and Joint Surgery-American Volume, 2003
- Drilling in Bone: Modeling Heat Generation and Temperature DistributionJournal of Biomechanical Engineering, 2003
- Cancellous Bone Screw Thread Design and Holding PowerJournal of Orthopaedic Trauma, 1996
- Improvement of the Bone-Pin Interface with Hydroxyapatite Coating: An In Vivo Long-Term Experimental StudyJournal of Orthopaedic Trauma, 1996
- Hydroxyapatite Coated External Fixation PinsPublished by Ovid Technologies (Wolters Kluwer Health) ,1996
- Thermal response and torque resistance of five cortical half‐pins under simulated insertion techniqueJournal of Orthopaedic Research, 1995
- CORTICAL BONE REACTIONS AT THE INTERFACE OF EXTERNAL FIXATION HALF-PINS UNDER DIFFERENT LOADING CONDITIONSJournal Of Trauma-Injury Infection and Critical Care, 1993
- Induction and Prevention of Pin Loosening in ExternalJournal of Orthopaedic Trauma, 1991
- The Effect of Radial Preload on the Implant-Bone InterfaceJournal of Orthopaedic Trauma, 1989