Different microbiological profiles between hip and knee prosthetic joint infections

Area of Science:

• Orthopedics
• Infectious Diseases
• Microbiology

Background:

• Prosthetic joint infection (PJI) is a significant complication following hip and knee replacement surgery.
• Understanding the microbiological profiles of PJI is crucial for effective treatment strategies.

Purpose of the Study:

• To analyze the demographics and microbiological profiles of hip and knee PJI.
• To compare the microbiological differences between hip and knee PJI.

Main Methods:

• A retrospective study was conducted on 294 PJI cases from January 2006 to December 2014.
• Cases were categorized into hip PJI (159) and knee PJI (135).

Main Results:

• Staphylococcus aureus was the most common pathogen (27%), followed by coagulase-negative staphylococci (CoNS, 14%). Methicillin-resistant staphylococci (MRS) accounted for 21% of cases.
• Polymicrobial pathogens, anaerobes, and enteric gram-negative bacilli (GNB) were significantly more prevalent in hip PJI than knee PJI.
• Fungal and mycobacterial infections were rare (4.1%) but noted.

Conclusions:

• Hip PJI demonstrated a higher incidence of polymicrobial pathogens, anaerobes, and enteric GNB compared to knee PJI.
• The high prevalence of MRS necessitates broader empiric antibiotic coverage for PJI pending culture results.
• Fungal and mycobacterial PJI, though rare, warrant consideration in persistent cases, especially in regions like Taiwan.