Experimental study on the cement mantle in hip arthroplasty: effect of defects on the property of the materials used.
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.
Fognani
R
R
Laboratorio di Tecnologia Medica, Istituti Ortopedici Rizzoli, Bologna, Italia.
Baleani
M
M
Toni
A
A
D019644:Arthroplasty, Replacement, Hip; D001843:Bone Cements; D008422:Materials Testing; D016062:Porosity
D001843:Bone Cements