title: Differences in the surface composition of seemingly similar F75 cobalt-chromium micron-sized particulates can affect synovial fibroblast viability.
abstract: We present data and analyses concerning the cytotoxicity and bioreactivity associated with the surface composition of fine metal particulates that are similar to those commonly released in the body by prostheses used in total joint replacement surgery. Here we study the bulk and surface compositions of three separately procured cobalt-chromium-molybdenum (CoCrMo) micron-sized particulate powders, each identified by their corresponding vendor as being ASTM F75 grade material. We use energy dispersive spectroscopy (EDS) to verify the bulk metallic composition and X-ray photoelectron spectroscopy (XPS) to examine the surface metallic composition of each CoCrMo powder. Cultured synovial fibroblasts were then exposed to the particulate powders to see how the metallic surfaces might affect cellular viability. Results indicate that while the bulk metallic composition of each CoCrMo powder was similar, the surface metallic compositions were found to be dramatically different and yielded equally dramatic differences in terms of cytotoxicity and bioreactivity of synovial fibroblast in culture.
authors.affiliation: Walter A. Hoyt, Jr. Musculoskeletal Research Laboratory, Department of Orthopaedic Surgery, Summa Health System Hospitals, Akron, OH 44309-2090, United States. kovacikm@summa-health.org
authors.forename: M W
authors.initials: MW
authors.lastname: Kovacik
authors.forename: R A
authors.initials: RA
authors.lastname: Mostardi
authors.forename: D R
authors.initials: DR
authors.lastname: Neal
authors.forename: T F
authors.initials: TF
authors.lastname: Bear
authors.forename: M J
authors.initials: MJ
authors.lastname: Askew
authors.forename: E T
authors.initials: ET
authors.lastname: Bender
authors.forename: J I
authors.initials: JI
authors.lastname: Walker
authors.forename: R D
authors.initials: RD
authors.lastname: Ramsier
mesh_terms: D002857:Chromium / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D005347:Fibroblasts / Q000166:cytology; D008854:Microscopy, Electron; D013057:Spectrum Analysis / Q000379:methods; D013499:Surface Properties; D013583:Synovial Membrane / Q000166:cytology*; D014965:X-Rays
chemical_list: D002857:Chromium; D003035:Cobalt