TY - JOUR
T1 - Effect of stem preheating on the fatigue behaviour of bone cement around hip prostheses
AU - Bialoblocka-Juszczyk, E.
AU - Baleani, M.
AU - Cristofolini, L.
AU - Viceconti, M.
PY - 2009/7/1
Y1 - 2009/7/1
N2 - Tensile fatigue behaviour of bone cement specimens obtained from cement mantles moulded in vitro, simulating the surgical scenario, was investigated. The effect of stem preheating, before its insertion into the cement dough, on specimen fatigue life was studied. A commercial bone cement was selected for this study. Bone cement mixing was conducted in air, following the manufacturer's instructions, and injected simulating the clinical practice. Two conditions were considered: stem maintained at the surgical room temperature (23°C), and stem preheated to 45°C. Four repetitions of the whole procedure were performed for each condition obtaining a total of 32 specimens. All specimens underwent fatigue testing (stress ratio, 0; maximum tensile stress, 15MPa) until failure. Both two-parameter and three-parameter Weibull distributions were initially used to analyse the fatigue life data set. However, the two-parameter distribution was chosen for both groups on the basis of the coefficient of determination used to test the goodness of fit. Stem preheating seems to have a negligible effect on fatigue behaviour of the studied bone cement in the low range of fatigue lives (up to 104). However, above this number of cycles, stem preheating seems to reduce the probability of failure. These findings are discussed in the text.
AB - Tensile fatigue behaviour of bone cement specimens obtained from cement mantles moulded in vitro, simulating the surgical scenario, was investigated. The effect of stem preheating, before its insertion into the cement dough, on specimen fatigue life was studied. A commercial bone cement was selected for this study. Bone cement mixing was conducted in air, following the manufacturer's instructions, and injected simulating the clinical practice. Two conditions were considered: stem maintained at the surgical room temperature (23°C), and stem preheated to 45°C. Four repetitions of the whole procedure were performed for each condition obtaining a total of 32 specimens. All specimens underwent fatigue testing (stress ratio, 0; maximum tensile stress, 15MPa) until failure. Both two-parameter and three-parameter Weibull distributions were initially used to analyse the fatigue life data set. However, the two-parameter distribution was chosen for both groups on the basis of the coefficient of determination used to test the goodness of fit. Stem preheating seems to have a negligible effect on fatigue behaviour of the studied bone cement in the low range of fatigue lives (up to 104). However, above this number of cycles, stem preheating seems to reduce the probability of failure. These findings are discussed in the text.
KW - Bone cement
KW - Cemented prostheses
KW - Fatigue life
KW - Mechanical behaviour
KW - Stem preheating
UR - http://www.scopus.com/inward/record.url?scp=67650700739&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=67650700739&partnerID=8YFLogxK
U2 - 10.1243/09544119JEIM558
DO - 10.1243/09544119JEIM558
M3 - Article
C2 - 19623915
AN - SCOPUS:67650700739
VL - 223
SP - 637
EP - 641
JO - Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
JF - Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
SN - 0954-4119
IS - 5
ER -