title: Experimental study on the cement mantle in hip arthroplasty: effect of defects on the property of the materials used.
abstract: The study simulated implantation of a hip prosthesis stem in the femur. The cement mantle produced in vitro was observed under an optic microscope. A higher concentration of porosity in the cement mantle at the stem-cement interface was observed. By heating the stem to 45 degrees C and 55 degrees C the authors observed a reduction in porosity in the three surfaces examined: stem-cement interface, internal surface, and cement-pseudofemur interface. Heating of the stem causes a reduction in polymerization time and an increase in maximum temperature achieved during the polymerization process. A reduction in porosity at the stem-cement interface influenced bending strength of the specimens extracted from the mantle. A significant difference between resistance to flexion in the specimens produced with the stem at 55 degrees, and in those with the stem at 23 degrees C was observed.
authors.affiliation: Laboratorio di Tecnologia Medica, Istituti Ortopedici Rizzoli, Bologna, Italia.
authors.forename: R
authors.initials: R
authors.lastname: Fognani
authors.forename: M
authors.initials: M
authors.lastname: Baleani
authors.forename: A
authors.initials: A
authors.lastname: Toni
mesh_terms: D019644:Arthroplasty, Replacement, Hip; D001843:Bone Cements; D008422:Materials Testing; D016062:Porosity
chemical_list: D001843:Bone Cements