title: Influence of electron beam melting manufactured implants on ingrowth and shear strength in an ovine model.
abstract: Arthroplasty has evolved with the application of electron beam melting (EBM) in the manufacture of porous mediums for uncemented fixation. Osseointegration of EBM and plasma-sprayed titanium (Ti PS) implant dowels in adult sheep was assessed in graduated cancellous defects and under line-to-line fit in cortical bone. Shear strength and bony ingrowth (EBM) and ongrowth (Ti PS) were assessed after 4 and 12 weeks. Shear strength of EBM exceeded that for Ti PS at 12 weeks (P = .030). Ongrowth achieved by Ti PS in graduated cancellous defects followed a distinctive pattern that correlated to progressively decreasing radial distances between defect and implant, whereas cancellous ingrowth values at 12 weeks for the EBM were not different. Osteoconductive porous structures manufactured using EBM present a viable alternative to traditional surface treatments.
authors.affiliation: Surgical and Orthopaedic Research Laboratories, University of New South Wales, Prince of Wales Clinical School, Sydney, Australia.
authors.forename: Nicky
authors.initials: N
authors.lastname: Bertollo
authors.forename: Ruy
authors.initials: R
authors.lastname: Da Assuncao
authors.forename: Nicholas J
authors.initials: NJ
authors.lastname: Hancock
authors.forename: Abe
authors.initials: A
authors.lastname: Lau
authors.forename: William R
authors.initials: WR
authors.lastname: Walsh
mesh_terms: D000818:Animals; D004583:Electrons; D005615:Freezing; D023421:Models, Animal; D016348:Osseointegration; D019736:Prostheses and Implants; D011474:Prosthesis Design; D033081:Shear Strength; D012756:Sheep; D014025:Titanium
chemical_list: D014025:Titanium