Clinical Characteristics of Methicillin-resistant Staphylococcus aureus Infection for Chronic Periprosthetic Hip and Knee Infection

Area of Science:

• Orthopedics
• Infectious Diseases
• Clinical Microbiology

Background:

• Deep joint infection following hip and knee arthroplasty is a significant clinical challenge.
• Staphylococcus aureus is a common pathogen in prosthetic joint infections.
• Distinguishing between methicillin-resistant Staphylococcus aureus (MRSA) and methicillin-sensitive Staphylococcus aureus (MSSA) infections is crucial for treatment strategies.

Purpose of the Study:

• To compare the clinical course and laboratory findings of MRSA versus MSSA deep infections after hip and knee arthroplasty.
• To identify key differences in patient outcomes and inflammatory markers between MRSA and MSSA arthroplasty infections.

Main Methods:

• Retrospective review of 61 patients with staphylococcal infections post-arthroplasty (36 MRSA, 25 MSSA).
• Analysis of vital signs, laboratory tests (including CRP and ESR), microbiology, and clinical outcomes.
• Average follow-up period of 3.8 years.

Main Results:

• MRSA group exhibited significantly higher initial erythrocyte sedimentation rate, C-reactive protein (CRP), and neutrophil percentage.
• Normalization of CRP was prolonged in the MRSA group (36.7 days vs. 24.7 days).
• MRSA infections showed a higher recurrence rate (13.9% vs. 4%), longer interval to staging operations, and increased rates of sepsis-related mortality and limb amputation.

Conclusions:

• MRSA deep infections post-arthroplasty are associated with more pronounced inflammatory markers and a worse clinical prognosis compared to MSSA.
• Aggressive treatment approaches are warranted for MRSA infections following hip and knee arthroplasty to improve patient outcomes.