title: The effects of fluid penetration and interfacial porosity on the fixation of cemented femoral components.
abstract: We have investigated the role of the penetration of saline on the shear strength of the cement-stem interface for stems inserted at room temperature and those preheated to 37 degrees C using a variety of commercial bone cements. Immersion in saline for two weeks at 37 degrees C reduced interfacial strength by 56% to 88% after insertion at room temperature and by 28% to 49% after preheating of the stem. The reduction in porosity as a result of preheating ranged from 71% to 100%. Increased porosity correlated with a reduction in shear strength after immersion in saline (r = 0.839, p < 0.01) indicating that interfacial porosity may act as a fluid conduit.
authors.affiliation: Musculoskeletal Research Center, New York University Hospital for Joint Diseases, New York 10003, USA. kazuho@biomech.org
authors.forename: K
authors.initials: K
authors.lastname: Iesaka
authors.forename: W L
authors.initials: WL
authors.lastname: Jaffe
authors.forename: C M
authors.initials: CM
authors.lastname: Jones
authors.forename: F J
authors.initials: FJ
authors.lastname: Kummer
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D001843:Bone Cements; D002484:Cementation; D006801:Humans; D008422:Materials Testing / Q000379:methods; D016062:Porosity; D011475:Prosthesis Failure; D033081:Shear Strength; D012965:Sodium Chloride; D013696:Temperature
chemical_list: D001843:Bone Cements; D012965:Sodium Chloride