Intraoperative bacterial contamination in operations for joint replacement

Area of Science:

• Orthopedic Surgery
• Microbiology
• Infection Control

Background:

• Surgical instruments and operating room supplies can harbor bacteria, posing a risk of contamination during orthopedic procedures.
• Understanding microbial contamination is crucial for preventing surgical site infections (SSIs) in joint replacement surgeries.

Purpose of the Study:

• To quantify the prevalence and identify sources of microbial contamination during elective primary hip and knee arthroplasties.
• To establish a baseline for future studies on the bacteriology of revision arthroplasty.

Main Methods:

• Collection and microbiological analysis of samples from 100 elective primary hip and knee arthroplasties.
• Sampling included surgical instruments (sucker tips, light handles, blades), gloves, theatre gowns, needles, and collection bags.
• Identification of bacterial organisms and assessment of contamination rates across different items and procedures.

Main Results:

• Significant contamination rates were observed: sucker tips (11.4%), light handles (14.5%), skin blades (9.4%), inside blades (3.2%), preparation gloves (28.7%), collection bags (20%), theatre gowns (17%), and closure needles (10%).
• Coagulase-negative staphylococcus was the predominant organism (76%).
• Overall, 63% of operations showed contamination within the surgical field.

Conclusions:

• Microbial contamination is prevalent during primary hip and knee arthroplasty, originating from various sources including instruments and personnel.
• The findings underscore the need for enhanced infection control measures and suggest potential practice modifications to minimize bacterial exposure.
• The study provides essential baseline data for investigating the bacteriology of revision arthroplasty and improving patient outcomes.