Abstract
Percutaneous osseointegrated (OI) prostheses directly connect an artificial limb to the residual appendicular skeleton via a permanently implanted endoprosthesis with a bridging connector that protrudes through the skin. The resulting stoma produces unique medical and biological challenges. Previously, a study using a large animal amputation model indicated that infection could be largely prevented, for at least a 12-month period, but the terminal epithelium continued to downgrow. The current study was undertaken to test the longer-term efficacy of this implant construct to maintain a stable skin-implant interface for 24 months. Using the previously successful amputation and implantation surgical procedure, a total of eight sheep were fitted with a percutaneous OI prosthesis. Two animals were removed from the study due to early complications. Of the remaining six sheep, one (16.7%) became infected at 15-months post-implantation and five remained infection-free for the intended 24 months. The histological data of the remaining animals further confirmed the grossly observable epithelial downgrowth. Albeit a receding interface, it was clear that all animals that survived to the end of the study had residual fibrous soft-tissue ingrowth into, and debris within, the exposed titanium porous-coated surface. Overall, the data demonstrated that the porous coated subdermal barrier offered initial protection against infection. However, the fibrous skin attachment was continuously lysed over time by the down-growing epithelium.
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Acknowledgements
This research is supported by the Department of Defense (W81XWH-11-1-0435) grant, the Office of Rehabilitation R&D Service, DVA SLC HCS, the Albert & Margaret Hofmann Chair, and the Department of Orthopaedics, University of Utah School of Medicine, Salt Lake City. Authors would like to express their sincere gratitude to the DJO Global for supplying the implants, and IMDS Inc. for animal study support. Authors also would like to thank Roy D. Bloebaum, Ph.D., and his team at the Bone and Joint Research Laboratory, SLC VA Medical Center for embedding the post-mortem samples and for acquiring the SEM data. While the US Army Medical Research Acquisition Activity (Fort Detrick, MD, USA) awarded and administering acquisition office for this study, the content of this research does not necessarily reflect the position or the policy of the Government, and no official endorsement should be inferred.
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Jeyapalina, S., Beck, J., Agarwal, J. et al. A 24-month evaluation of a percutaneous osseointegrated limb-skin interface in an ovine amputation model. J Mater Sci: Mater Med 28, 179 (2017). https://doi.org/10.1007/s10856-017-5980-x
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DOI: https://doi.org/10.1007/s10856-017-5980-x