Damage evolution in acetabular replacements under long-term physiological loading conditions.
Damage development in cemented acetabular replacements has been studied in bovine pelvic bones under long-term physiological loading conditions, including normal walking, stair climbing and a combined block loading with representative routine activities. The physiological loading conditions were achieved using a specially designed hip simulator for fixation endurance testing. Damage was detected and monitored using micro-CT scanning at regular intervals of the experiments, and verified by microscopic studies post testing. The results show that debonding at the bone-cement interface defined the failure of cement fixation in all cases, and debondings initiated near the dome of the acetabulum in the superior-posterior quadrant, consistent with the high-stress region identified from the finite element analysis of implanted acetabular models Zant, N.P., Heaton-Adegbile, P., Hussell, J.G., Tong, J., 2008b. In-vitro fatigue failure of cemented acetabular replacements-a hip simulator study. Journal of Biomechanical Engineering, Transactions of the ASME, 130, 021019-1-9]; [Tong, J., Zant, N.P., Wang, J-Y., Heaton-Adegbile, P., Hussell, J.G., 2008. Fatigue in cemented acetabulum. International Journal of Fatigue, 30(8), 1366-1375].
Department of Mechanical and Design Engineering, University of Portsmouth, Hants, UK.
J-Y
JY
Wang
P
P
Heaton-Adegbile
A
A
New
J G
JG
Hussell
J
J
Tong
D000077:Acetabulum / Q000000981:diagnostic imaging* / Q000502:physiology; D000818:Animals; D001843:Bone Cements; D002417:Cattle; D003198:Computer Simulation; D006801:Humans; D010384:Pelvic Bones / Q000502:physiology; D019736:Prostheses and Implants; D011859:Radiography
D001843:Bone Cements