The purpose of this study was to investigate the airborne microorganisms in environments where shoulder arthrographies are performed. Using an air sampler assembly we measured the bacterial count of airborne microorganisms in an imaging room, a general operating room and a bioclean operating room (OR). The measurement method attracted air at 1601/4min to a nutrient medium and cultured it. The bacterial number in lft
3 was then measured. The bacterial numbers were 2.94 ±0.83CFU/ft
3 in the imaging room while not in use and 31.25 ± 2.14CFU/ft
3 in the imaging room while in use. They were 13.90 ± 1.81 CFU/ft
3 in the OR while not in use and 25.91 ± 3.64 CFU/ft3 in the OR while in use. They were 0.11 ± 0.04CFU/ft
3 in the bioclean OR. According to a questionnaire study regarding complications from arthrography (Hugo etc), the infection number was reported as twenty-nine cases among 262,000 arthrographic procedures, but data about specific cases where injected air was used were unknown. We demonstrated that the number of airborne microorganisms were large quantities and the kinds of bacteria were various in the environment where shoulder arthrography is performed. According to our results, we were unable to deny the likelihood of incidence of septic arthritis at the time of arthrogram examination when injected room air was used, depending on the conditions of the collected air itself. These results suggested that when injected air was used in a joint as a contrast medium negative, it was necessary to consider carefully the conditions of the collected air.
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