LAUSR

INTRODUCTION The purpose of this study is to assess the impact of a germicidal ultraviolet light-emitting diode (LED) on the contamination level of a back table in the operating room (OR) during total joint arthroplasty (TJA) procedures. METHODS Eight Tryptic Soy Agar (TSA) petri plates were placed on a table located near the operative field and exposed to air. One plate was removed on the hour over an 8-hour time span. The back table had either an UV-LED for disinfection or a sham UV-LED. This process was repeated in 12 different ORs (6 with UV light, 6 with sham device). The plates were then incubated for 48 hours at 36° +/- 1° C. Colony forming units (CFU) were recorded 24 and 48 hours after incubation. RESULTS There was a statistically significant difference in total CFUs between the intervention vs. sham at 24-hours (27 vs. 95, p=0.0001) and 48-hours (38 vs. 122, p<0.0001). The multivariate analysis revealed that the 24-hour and 48-hour count, the predictors UV light (p=0.002) and hour of plate removal (p=0.050) were statistically significantly associated with CFU counts. Together, the predictor variables explained 15.8% and 23.0% of the variance in CFU counts at 24- and 48-hours, respectively. CONCLUSIONS A back table UV-LED may decrease environmental contamination near the operative field. This has potential to lead to a decrease in joint infection.