“…Intraoperatively, many surgeons prefer the use of helmets, but concerns exist with regard to the potential contamination of the fan. One study suggested that the fan should run for 3 minutes prior to entering the operating room to decrease the risk of contamination 17 . We have made great strides reducing the rates of PJI following primary TKA and THA over the last decade, but there is more work to be done.…”