title: Interfacial shear strength of bioactive-coated carbon fiber reinforced polyetheretherketone after in vivo implantation.
abstract: Despite the excellent osseointegration of carbon-fiber-reinforced polyetheretherketone (CFR/PEEK) with a surface hydroxyapatite (HA) coating, the bone-implant interfacial shear strength of HA-coated CFR/PEEK after osseointegration is unclear. We examined the interfacial shear strength of HA-coated CFR/PEEK implants after in vivo implantation in a rabbit femur-implant pull-out test model. HA coating was performed by a newly developed method. Uncoated CFR/PEEK, HA-coated blasted titanium alloy, and uncoated blasted titanium alloy were used as control implants. The implants were inserted into drilled femoral cortex, and pull-out tests were conducted after 6 and 12 weeks of implantation to determine maximum interfacial shear strength. The HA-coated CFR/PEEK (15.7  ± 4.5 MPa) and HA-coated titanium alloy (14.1  ±  6.0 MPa) exhibited significantly larger interfacial shear strengths than the uncoated CFR/PEEK (7.7 ± 1.8 MPa) and the uncoated titanium alloy (7.8  ±  2.1 MPa) at 6 weeks. At 12 weeks, only the uncoated CFR/PEEK (8.3  ±  3.0 MPa) exhibited a significantly smaller interfacial shear strength, as compared to the HA-coated CFR/PEEK (17.4  ±  3.6 MPa), HA-coated titanium alloy (14.2  ±  4.8 MPa), and uncoated titanium alloy (15.0  ±  2.6 MPa). Surface analysis of the removed implants revealed detachment of the HA layer in both the HA-coated CFR/PEEK and titanium alloy implants. The proposed novel HA coating method of CFR/PEEK significantly increased interfacial shear strength between bone and CFR/PEEK. The achieved interfacial shear strength of the HA-coated CFR/PEEK implant is of the same level as that of grit-blasted titanium alloy with HA.
authors.affiliation: Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Osaka, Japan.
authors.forename: Ichiro
authors.initials: I
authors.lastname: Nakahara
authors.forename: Masaki
authors.initials: M
authors.lastname: Takao
authors.forename: Tomoyo
authors.initials: T
authors.lastname: Goto
authors.forename: Chikara
authors.initials: C
authors.lastname: Ohtsuki
authors.forename: Shigeru
authors.initials: S
authors.lastname: Hibino
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Sugano
mesh_terms: D000818:Animals; D001577:Benzophenones; D001672:Biocompatible Materials; D002244:Carbon; D000077482:Carbon Fiber; D017886:Durapatite; D007659:Ketones; D008422:Materials Testing; D011092:Polyethylene Glycols; D011108:Polymers; D019736:Prostheses and Implants; D019919:Prosthesis Implantation; D011817:Rabbits; D033081:Shear Strength
chemical_list: D001577:Benzophenones; D001672:Biocompatible Materials; D000077482:Carbon Fiber; D007659:Ketones; D011108:Polymers; C063834:polyetheretherketone; D011092:Polyethylene Glycols; D002244:Carbon; D017886:Durapatite