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Background: The effectivity of applying antiseptics in preparation of the operative site on the reduction of post-operative infections is not quite clear and controversies exist about the best method for doing this. The aim of this study is to compare the traditional two-stage method of first, washing the site with povidone iodine scrub and then painting with aqueous povidone iodine with the method of washing the site only with povidone iodine scrub. Materials and Methods: In this retrospective study, patients who had been under knee arthroscopy in 2 separate hospitals by the same surgeon were compared with regard to post operative infection. In one hospital, the operative site was only washed with povidone iodine scrub, while in the other hospital this same procedure was followed by painting with aqueous povidone iodine. The primary goal of this study was to identify the patients who had manifested clinical and laboratory signs of superficial or deep infection or septic arthritis one month postoperatively. Results: A total 300 patients were studied in two equal groups. All the patients had only been under diagnostic or curative non-bony operations. No superficial or deep infection or septic arthritis were seen in any of the patients in the two groups. Conclusion: Preoperative preparation of the knee with povidone iodine scrub is a safe method for prevention of infection and can be used instead of the common two-stage method of using povidone iodine scrub and then painting with aqueous povidone iodine since this can decrease the time and cost of surgery.

Keywords: Knee arthroscopy, Painting, Povidone iodine, Preoperative preparation of the site

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