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Journal of Long-Term Effects of Medical Implants
SJR: 0.145 SNIP: 0.491 CiteScore™: 0.89

ISSN Imprimir: 1050-6934
ISSN En Línea: 1940-4379

Journal of Long-Term Effects of Medical Implants

DOI: 10.1615/JLongTermEffMedImplants.2014010118
pages 77-88

Implant Debris Particle Size Affects Serum Protein Adsorption Which May Contribute to Particle Size-Based Bioreactivity Differences

Anand Reddy
Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL 60612
Marco S. Caicedo
Orthopedic Analysis, LLC, Chicago, IL 60612; Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL 60612
Lauryn Samelko
Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL 60612
Joshua J. Jacobs
Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL 60612
Nadim James Hallab
Orthopedic Analysis, LLC, Department of Immunology, Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL 60612

SINOPSIS

Biologic reactivity to orthopedic implant debris mediates long-term clinical performance of total joint arthroplasty implants. However, the reasons that some facets of implant debris (e.g., particle size, shape, base material, etc.) are more pro-inflammatory remain controversial. This precludes accurate prediction and optimal design of modern total joint replacements. We hypothesized that debris particle size can influence adsorbed protein film composition and affect subsequent bioreactivity. We measured size-dependent proteinfilm adsorption, and adsorbed protein-film-dependent cytokine release using equal surface areas of different sized cobalt-chromium alloy (CoCr-alloy) particles and in vitro challenge of human macrophages (THP-1 and human primary). Smaller (5 μm diameter) versus larger (70 μm diameter) particles preferentially adsorbed more serum protein in general (p<0.03), where higher molecular weight serum proteins consistent with IgG were identified. Additionally, 5-μm CoCr-alloy particles pre-coated with different protein biofilms (IgG vs. albumin) resulted in a difference in cytokine expression in which albumin-coated particles induced more TNF-α release and IgG-coated particles induced more IL-1β release from human monocytes/macrophages. In these preliminary in vitro studies, we have demonstrated the capability of equal surface areas of different particle sizes to influence adsorbed protein composition and that adsorbed protein differences on identical particles can translate into complex differences in bioreactivity. Together, these findings suggest that adsorbed protein differences on different-sized particles of the same material may be a contributing mechanism by which certain particles induce different reactivities.


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