Abstract
Large structural allografts used for reconstruction of bone defects after revision arthroplasty and tumor resection fracture up to 27% of the time from osteolytic resorption around the fixation screw holes and tendon or ligament attachment sites. Treating structural allografts before implantation with bisphosphonates may inhibit local osteoclastic processes and prevent bone resorption and the development of stress risers, thereby reducing the long-term fracture rate. Taking advantage of allografts’ open-pore structure, we asked whether passive soaking or positive-pressure pumping was a more efficient technique for delivering bisphosphonates. We treated matched pairs of ovine tibial allografts with fluids containing Tc-99m pamidronate and toluidine blue stain to facilitate indicator distribution analysis via microSPECT-microCT imaging and light microscopy, respectively. Surfactants octylphenoxy polyethoxy ethanol or beractant were added to the treatment fluids to reduce flow resistance of solutions pumped through the allografts. Indicator distribution after 1 hour of soaking produced a thin ring around periosteal and endosteal surfaces, while pumping for 10 minutes produced a more even distribution throughout the allograft. Flow resistance was reduced with octylphenoxy polyethoxy ethanol but unaffected with beractant. Pumped allografts displayed a more homogeneous indicator distribution in less time than soaking while surfactants enhanced fluid movement.
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Acknowledgments
We thank Abbott Laboratories for donating the beractant (Survanta®), and Colorado State University College of Veterinary Medicine for donating the ovine sheep tibia.
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One or more of the authors (CM, JHH) has received funding from the Orthopaedic Research and Education Foundation; the Musculoskeletal Transplant Foundation; and the Biomet Oncology Fellowship. We acknowledge technical services provided by the MSKCC Small-Animal Imaging Core Facility, supported in part by NIH Small Animal Imaging Research Program (SAIRP) grant #R24 CA83084 and NIH Center Grant #P30 CA 08748.
Each author certifies that his or her institution has approved the animal protocol for this investigation and that all investigations were conducted in conformity with ethical principles of research.
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DiResta, G.R., Manoso, M.W., Naqvi, A. et al. Bisphosphonate Delivery to Tubular Bone Allografts. Clin Orthop Relat Res 466, 1871–1879 (2008). https://doi.org/10.1007/s11999-008-0259-7
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DOI: https://doi.org/10.1007/s11999-008-0259-7