Abstract
We and others have shown that changing surface characteristics of the spacer implanted during the first Masquelet stage alters some aspects of membrane development. Previously we demonstrated that titanium (TI) spacers create membranes that are better barriers to movement of solutes > 70 kDa in size than polymethyl methacrylate (PMMA) induced-membranes, and roughening creates more mechanically compliant membranes. However, it is unclear if these alterations affect the membrane’s biochemical environment or bone regeneration during the second stage. Ten-week-old, male Sprague–Dawley rats underwent an initial surgery to create an externally stabilized 6 mm femoral defect. PMMA or TI spacers with smooth (~ 1 μm) or roughened (~ 8 μm) surfaces were implanted. Four weeks later, rats were either euthanized for membrane harvest or underwent the second Masquelet surgery. TI spacers induced thicker membranes that were similar in structure and biochemical expression. All membranes were bilayered with the inner layer having increased factor expression [bone morphogenetic protein 2 (BMP2), transforming growth factor beta (TGFβ), interleukin 6 (IL6), and vascular endothelial growth factor (VEGF)]. Roughening increased overall IL6 levels. Ten-weeks post-engraftment, PMMA-smooth induced membranes better supported bone regeneration (60% union). The other groups only had 1 or 2 that united (9–22%). There were no significant differences in any micro computed tomography or dynamic histology outcome. In conclusion, this study suggests that the membrane’s important function in the Masquelet technique is not simply as a barrier. There is likely a critical biochemical, cellular, or vascular component as well.
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Abbreviations
- PMMA:
-
Polymethyl methacrylate—traditional spacer material, also known as bone cement
- TI:
-
Titanium—experimental spacer material
- PBS:
-
Phosphate buffered saline—wash solution
- DAPI:
-
4′,6-Diamidino-2-phenylindole—nuclear stain
- TGFβ:
-
Transforming growth factor beta—positive regenerative protein
- BMP2:
-
Bone morphogenetic protein 2—positive regenerative protein—promotes osteogenic differentiation
- VEGF:
-
Vascular endothelial growth factor—positive regenerative protein—promotes angiogenesis
- IL6:
-
Interleukin 6—negative regenerative protein—proinflammatory factor
- microCT:
-
Micro computed tomography
- BV/TV :
-
Bone volume/total volume fraction—fraction of volume of interest filled with bone
- TV :
-
Total volume—total volume of interest
- BV :
-
Bone volume—bone within the total volume of interest
- BMD :
-
Bone mineral density—average mineral density of both bone and space within the volume of interest
- TMD :
-
Tissue mineral density—average mineral density of only bone within the volume of interest
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Acknowledgments
We would like to thank Brendon King and Stephanie Podgorny for their efforts on these projects as part of the STARS Summer Program for High School Students (data collection). This work was supported by the Washington University Musculoskeletal Research Center (NIH P30 AR057235) as well as direct funding from the AO Foundation (AO Start-up Grant S-15-190M) and Saint Louis University (Presidential Research Fund).
Conflict of interest
Dr. J. Tracy Watson has intellectual property rights with and receives royalties from Smith and Nephew, Zimmer Biomet, and Advanced Orthopaedic Solutions. He has intellectual property rights with and is a Consultant for Advanced Orthopaedic Solutions. None of these are direct conflicts of interest to this research. All other authors have no conflicts to declare.
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Associate Editor Eric M. Darling oversaw the review of this article.
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Toth, Z., Roi, M., Evans, E. et al. Masquelet Technique: Effects of Spacer Material and Micro-topography on Factor Expression and Bone Regeneration. Ann Biomed Eng 47, 174–189 (2019). https://doi.org/10.1007/s10439-018-02137-5
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DOI: https://doi.org/10.1007/s10439-018-02137-5