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Time-dependent surgical instrument contamination begins earlier in the uncovered table than in the covered table

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Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

Time-dependent surgical instrument contamination and the effect of covering during arthroplasty have not been investigated. This study aimed to evaluate time-dependent contamination of surgical instruments and the effect of covering on contamination as well as to perform bacterial typing of contaminated samples. The hypothesis was that covering the surgical instruments would decrease contamination rates.

Methods

Sixty patients who underwent total knee arthroplasty were randomized and divided into two groups: surgical instruments covered with a sterile towel or surgical instruments left uncovered. K-wires were used to extract microbiological samples. The K-wires were placed in a liquid culture medium at 0, 15, 30, 60, 90, and 120 min. After 24-h incubation period, samples from liquid cultures were cultured on blood agar using swabs. Samples with growth after 48 h were considered contaminated. Microscopic, staining, and biochemical properties were used for bacterial typing.

Results

Bacterial growth started after 30 and 60 min in the uncovered and covered groups, respectively. An increase in the number of K-wires contaminated with time was detected. At least 10,000 CFU/mL bacterial load was observed in the culture samples. Contamination was more significant in the uncovered group. A statistically significant difference in contamination was found between the uncovered and covered groups at 30-, 60-, 90-, and 120 min (p = 0.035, p = 0.012, p = 0.024, and p = 0.037, respectively). The most common bacteria on the contaminated instruments were coagulase-negative Staphylococci (60.4%), Staphylococcus aureus (22.9%), and Streptococcus agalactia (16.7%), respectively.

Conclusion

The risk of contamination increases with time. However, it may decrease if surgical instruments are covered. In the clinical practice, empiric antibiotic regimens based on the type of identified microorganisms in this study may be developed for postoperative periprosthetic joint infection prophylaxis.

Level of evidence

Prognostic, Level II.

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Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Correspondence to Abdulhamit Misir.

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Conflict of interest

Erdal Uzun, Abdulhamit Misir, Mustafa Ozcamdalli, Emine Eylul Kizkapan, Alper Cirakli, and Mustafa Kerem Calgin declare that they have no actual or potential conflict of interest including any financial, personal, or other relationships with other people or organizations within 3 years of beginning the submitted work that could inappropriately influence, or be perceived to influence, their work.

Ethical approval

Ordu University, Faculty of Medicine clinical investigations ethics committee approved the study protocol (Approval date/number:18.10.2018/2018-215).

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Uzun, E., Misir, A., Ozcamdalli, M. et al. Time-dependent surgical instrument contamination begins earlier in the uncovered table than in the covered table. Knee Surg Sports Traumatol Arthrosc 28, 1774–1779 (2020). https://doi.org/10.1007/s00167-019-05607-y

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  • DOI: https://doi.org/10.1007/s00167-019-05607-y

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