The effect of the extracorporeal shock wave lithotriptor on the bone-cement interface in dogs

摘要: The extracorporeal shock wave lithotriptor (ECSWL) is a machine that generates waves transfer energy through biologic materials. This study focused the at composite bone-cement (polymethylmethacrylate) interface and evaluated effects both quantitatively qualitatively. Six matched sets of dog femora were selected. intramedullary canals packed uniformly with cement. One set was randomly selected for treatment impulses while other served as control. bone then sectioned transversely into discs, scanning electron microscopy mechanical push-out studies performed. results indicated ECSWL does have loosening effect on interface. Using paired Student's t-test, shear strength significantly less in treated group than control (p 0.003). Microscopically, specimens revealed relative sparing surrounding bone. At interface, however, microfractures, loose bodies, widening seen. Revision total arthroplasty has significant morbidity, which can be partially attributed to cement extraction. this indicate may useful adjunct revision surgery by facilitating extraction polymethylmethacrylate thereby reducing morbidity.