Precise lateral dose profile measurements of surface interfaces of hip prostheses Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/p2676x73j

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  • With the growing incidence of total hip replacements performed each year in the United States, the incidence of patients with prosthesis requiring radiotherapy is bound to increase. It is necessary to understand and quantify the effects of the high atomic number material prostheses used in total hip replacements on therapeutic radiation therapy (RT), specifically the surface interface absorbed dose. In order to understand the effect this will have on the implant it is necessary to have an accurate measurement of dose to the tissue affected by the presence of the prosthesis. In this study, Gafchromic™ (Covington, KY) EBT3 film was employed in the measurement setup to gather the precise surface interface absorbed dose associated with specific high atomic number materials typically used in hip prostheses. The materials used were a 1” stainless steel (SS) rod, a ½" stainless steel rod, a 1" titanium (Ti) rod, a ½" titanium rod, a Tri Lock® (Warsaw, IN) hip stem with Gription® (Warsaw, IN) coating, and an Anatomical Medullary Locking® (AML®) (Warsaw, IN) hip stem with Porocoat® (Warsaw, IN) coating. The average relative surface interface dose values gathered were greater for the 6 MV beam photon than the 18 MV photon beam, and the profile shape changed slightly with the addition of the porous coatings used on the hip stems. The results of this study provide a dosimetric basis for analysis of radiation effects involving the porous coating of modern hip prostheses for the continued research into the radiobiological effect of high atomic number material prostheses in the body on RT.
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