植入物界面結(jié)核分枝桿菌生物膜形成的實驗研究
[Abstract]:[objective] to study the adhesion ability and biofilm formation of Mycobacterium tuberculosis at the interface of different implants, and to observe the effect of rifampicin on the adhesion ability and biofilm of Mycobacterium tuberculosis. And the formation of biofilm of Mycobacterium tuberculosis in bone tuberculosis lesions at the implant interface, and to explore the feasibility and safety of one-stage internal fixation or joint formation technique in the treatment of active bone and joint tuberculosis. To provide a solid theoretical basis for the safe and reliable treatment of active bone tuberculosis by internal fixation or artificial articulation. [methods] Titanium alloy, cobalt-chromium-molybdenum alloy, The implants of three kinds of polyethylene materials were placed in the suspension of Mycobacterium tuberculosis prepared by Middlebrook 7H9 liquid medium in aseptic condition. After 4 weeks of co-culture, one piece was taken out at random, and then added rifampicin solution for 2 weeks. After fixing, drying and spraying gold, the samples were observed by electron microscope, and the number of colony adhesion per unit area of implant interface was counted. The effect of Mycobacterium tuberculosis on different implants (titanium alloy, cobalt-chromium-molybdenum alloy, polyethylene) and interface (smooth surface) were compared. The adhesiveness of rifampicin was observed before and after the intervention of rifampicin, and the biofilm structure of implant interface was observed. To collect the internal objects taken out by the patients with recurrent bone tuberculosis after reoperation, after fixation, drying, and spraying gold, The formation of biofilm was observed by scanning electron microscope. [results] before the intervention of rifampicin, the number of colonies adhered to the interface of polyethylene was significantly higher than that of the interface of cobalt, chromium and molybdenum. There was significant difference (P0.05); there was no significant difference in colony number between cobalt, chromium-molybdenum interfacial adhesion and titanium alloy interface (P0.05); after rifampicin intervention, the number of colonies at the interface of the three implants decreased significantly. The difference was statistically significant. The interface roughness of implants is different, and the adhesion ability of Mycobacterium tuberculosis is different, so it is easier to adhere to the rough interface of implants. There was a first order interaction between implant interface and material properties (P0.05). Mycobacterium tuberculosis did not form biofilm at the interface of cobalt, chromium and molybdenum, but typical biofilm formation could be seen at the interface of polyethylene, but rifampicin could inhibit or even destroy the biofilm. The interface of the implants extracted from the bone tuberculosis lesions was only scattered in the adhesion of Mycobacterium tuberculosis, either dried or cracked, and no biofilm formation was observed. [conclusion] the adhesion ability of Mycobacterium tuberculosis to the implants and the material properties of the implants were observed. The biofilm can be formed at the implant interface, but it is selective and specific. Rifampicin can reduce the ability of mycobacterium tuberculosis to adhere to the implant interface, and can inhibit or even destroy TB biofilm. In the focus of bone tuberculosis, no mycobacterium tuberculosis formed biofilm at the interface of the implanted titanium alloy and cobalt chromium-molybdenum material. The low adhesion of Mycobacterium tuberculosis to the implant interface and the rare formation of biofilm are the key factors for the primary debridement and internal fixation of active bone joint tuberculosis or for the safety and feasibility of joint formation. Under the premise of systemic and local use of antituberculous drugs, selective implant implantation of tuberculosis does not increase the risk of postoperative recurrence of bone tuberculosis.
【學位授予單位】:天津醫(yī)科大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:R687;R529.2
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