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Preoperative Skin Preparation of the Foot and Ankle: Bristles and Alcohol Are Better

¹ Department of Orthopedic Surgery, Naval Medical Clinic Annapolis, 250 Wood Road, Annapolis, MD 21402. E-mail address: djkeblish{at}annapolis.med.navy.mil
² Department of Biostatistics, Children's Hospital, 300 Longwood Avenue, Boston, MA 02115. E-mail address: david.zurakowski{at}childrens.harvard.edu
³ Foot and Ankle Service, Department of Orthopedic Surgery, Brigham and Women's Hospital, 75 Francis Street, Boston, MA 02115. E-mail address for M.G. Wilson: mgwilson{at}partners.org. E-mail address for C.P. Chiodo: cchiodo{at}partners.org

Investigation performed at the Brigham Foot and Ankle Center, Faulkner Hospital, Boston, Massachusetts

The authors did not receive grants or outside funding in support of their research or preparation of this manuscript. They did not receive payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity. No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, educational institution, or other charitable or nonprofit organization with which the authors are affiliated or associated.

Methods: Four skin-preparation techniques were studied in two sets of twenty-five volunteers. In phase I of the study, the right foot and ankle of each member of the first set of volunteers was prepared with method 1, which consisted of a two-stage povidone-iodine scrub and paint with use of soft sponges. The left foot and ankle was prepared with method 2, which consisted of method 1 as well as an additional prewash with 70% isopropyl alcohol. In phase II, the right foot and ankle of each member of the second set of volunteers was prepared with method 3, which consisted of a povidone-iodine scrub and paint with use of a bristled brush to scrub the foot. The left side was prepared with method 4, which consisted of an alcohol scrub and paint with use of a bristled brush to scrub the foot. At the end of the preparation process, specimens for aerobic bacterial cultures were obtained from the hallucal nail fold, interdigital web spaces, and anterior aspect of the ankle. Cultures were interpreted as positive or negative, and the results were also assessed quantitatively.

Results: The rates of positive cultures of the nail-fold specimens were 76% and 80% after methods 1 and 2 (soft sponges) and 76% and 12% after methods 3 and 4 (bristled brush). The reduction in the percentage of positive cultures with method 4 was highly significant (p < 0.001). Cultures of the specimens from the web spaces showed a significant difference in the rates of positive results between methods 1 and 2 (36% and 8%, p < 0.05) but no significant difference between methods 3 and 4 (12% and 0%, p = 0.25). The rates of positive cultures of specimens from the anterior aspect of the ankle were consistently low (4% for all methods). Quantitative analysis of positive cultures demonstrated significant reductions (p < 0.01) in heavy growth when bristled brushes had been used, both with povidone-iodine and isopropyl alcohol.

Conclusions: The use of isopropyl alcohol and the use of a bristled brush both have beneficial effects on the skin-preparation process before foot and ankle surgery. In the current investigation, the most effective technique was the use of isopropyl alcohol in conjunction with scrubbing with a bristled brush. Merely washing the foot with alcohol-soaked sponges provided limited benefit to the web spaces only.

Level of Evidence: Therapeutic Level I. See Instructions to Authors for a complete description of levels of evidence.

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