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Research ArticleArticles

Fortifying the Bone-Implant Interface Part 1: An In Vitro Evaluation of 3D-Printed and TPS Porous Surfaces

Regina F. MacBarb, Derek P. Lindsey, Chelsea S. Bahney, Shane A. Woods, Mark L. Wolfe and Scott A. Yerby
International Journal of Spine Surgery January 2017, 11 (3) 15; DOI: https://doi.org/10.14444/4015
Regina F. MacBarb
SI-BONE, Inc., San Jose, CA, USA
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Derek P. Lindsey
SI-BONE, Inc., San Jose, CA, USA
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Chelsea S. Bahney
Department of Orthopaedic Surgery, University of California, San Francisco, CA, USA
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Shane A. Woods
MPI Research, Mattawan, MI, USA
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Mark L. Wolfe
MPI Research, Mattawan, MI, USA
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Scott A. Yerby
SI-BONE, Inc., San Jose, CA, USA
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    Fig. 1

    Gross images of titanium plasma spray (TPS) coated and additive manufactured (AM) discs (top). Cross-section images taken from stereological analysis (bottom).

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    Fig. 2

    Representative scanning electron microscopy (SEM) images of unseeded titanium plasma spray (TPS) coated and additive manufactured (AM) discs (top left), discs after three weeks of culture with hFOB cells (bottom left), and of human cancellous bone allograft to show target surface topography (top right). Representative SEM images of nanocrystalline hydroxyapatite (HA) coating on an AM disc (bottom right).

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    Fig. 3

    Two-way ANOVA analysis of additive manufactured (AM) compared to titanium plasma spray (TPS) coated discs, with and without nanocrystalline hydroxyapatite (HA) coating for initial cell attachment (a) and cell proliferation (b). When warranted, a Tukey’s post hoc test was used. Analysis was conducted within each time point for each metric. * = p < 0.05, ** = p < 0.01, *** = p < 0.001, n = 5 per group, mean ± SD.

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    Fig. 4

    Two-way ANOVA analysis of additive manufactured (AM) compared to titanium plasma spray (TPS) coated discs, with and without nanocrystalline hydroxyapatite (HA) coating for alkaline phosphatase (ALP) activity (a) and calcium production (b). When warranted, a Tukey’s post hoc test was used. Analysis was conducted within each time point for each metric. * = p < 0.05, ** = p < 0.01, *** = p < 0.001, n = 5 per group, mean ± SD.

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    Table 1

    Surface characterization of titanium plasma spray (TPS) coated and additive manufactured (AM) discs.

    TPSAM
    Mean Porosity (%), mean ± SD58.8 ± 6.260.0 ±3.7
    Mean Pore Size (μm), mean ± SD141.7290.6
    Tissue Interface Height (μm)7431051
    Estimated Average Available Surface Area (mm2)649.391153.67
    *Estimated Surface Contact Angle θ (°), mean ± SD105.2 ± 12.470.1 ± 9.9
    • ↵* Note: Surface contact angle could not be measured on HA-coated discs due to their near perfect surface wettability.

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International Journal of Spine Surgery: 11 (3)
International Journal of Spine Surgery
Vol. 11, Issue 3
1 Jan 2017
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Fortifying the Bone-Implant Interface Part 1: An In Vitro Evaluation of 3D-Printed and TPS Porous Surfaces
Regina F. MacBarb, Derek P. Lindsey, Chelsea S. Bahney, Shane A. Woods, Mark L. Wolfe, Scott A. Yerby
International Journal of Spine Surgery Jan 2017, 11 (3) 15; DOI: 10.14444/4015

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Fortifying the Bone-Implant Interface Part 1: An In Vitro Evaluation of 3D-Printed and TPS Porous Surfaces
Regina F. MacBarb, Derek P. Lindsey, Chelsea S. Bahney, Shane A. Woods, Mark L. Wolfe, Scott A. Yerby
International Journal of Spine Surgery Jan 2017, 11 (3) 15; DOI: 10.14444/4015
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Keywords

  • additive manufacturing
  • titanium plasma spray coating
  • osteointegration
  • biomimetic implant surfaces

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