Biaxial flexural modulus of antibiotic-impregnated orthopedic bone cement.
Previously reported antibiotic-impregnated cement strengths have been based on uniaxial and fatigue testing methodologies. These methods may not provide an accurate characterization of bone cement's true load-bearing capacity in total joint replacement (TJR). The present study utilized biaxial testing to report on the properties of antibiotic-impregnated cement. Test groups included: PMMA mixed with Vancomycin, Gentamicin, Tobramycin, or no antibiotic (control). In comparison to the control group, PMMA samples mixed with powdered gentamicin resulted in an increase in the mean elastic modulus by 6.50% versus a drop noted with powdered vancomycin and tobramycin by 2.65 and 1.37% respectively. The mean elastic modulus in samples containing liquid gentamicin dropped by 11.6%. This study supports the continued use of powdered antibiotics when clinically indicated, but suggest caution in the use of liquid gentamicin in TJR.
Leone
James
J
Cambridge Memorial Hospital, Cambridge, Ontario, Canada.
Johnson
Amy
A
Ziada
Samir
S
Hashemi
Ata
A
Adili
Anthony
A
de Beer
Justin
J
D000900:Anti-Bacterial Agents / Q000737:chemistry*; D001672:Biocompatible Materials / Q000737:chemistry*; D001843:Bone Cements / Q000737:chemistry*; D004548:Elasticity; D005839:Gentamicins / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D013718:Tensile Strength; D014031:Tobramycin / Q000737:chemistry; D014640:Vancomycin / Q000737:chemistry
D000900:Anti-Bacterial Agents; D001672:Biocompatible Materials; D001843:Bone Cements; D005839:Gentamicins; D014640:Vancomycin; D019904:Polymethyl Methacrylate; D014031:Tobramycin