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Difficulty: EasyOrthopedic Surgery

A 5252-year-old man with a history of poorly controlled diabetes mellitus presents to the emergency department with a 2424-hour history of severe right knee pain, swelling, and subjective fevers. His temperature is 39.0∘C39.0^\circ\text{C} (102.2∘F102.2^\circ\text{F}), blood pressure is 130/80 mm Hg130/80\text{ mm Hg}, and pulse is 110/min110/\text{min}. Physical examination reveals a markedly erythematous, warm, and swollen right knee held in slight flexion. Any passive range of motion of the knee elicits excruciating pain. A large joint effusion is palpable.

Arrange the following management steps in the correct chronological order for this patient.

  1. 1Perform diagnostic arthrocentesis of the knee to obtain synovial fluid
  2. 2Administer empiric broad-spectrum intravenous antibiotics
  3. 3Review synovial fluid analysis results to confirm the diagnosis
  4. 4Perform urgent surgical joint irrigation and debridement

Answer

The correct chronological sequence is: 1) Perform diagnostic arthrocentesis to obtain synovial fluid, 2) Administer empiric broad-spectrum intravenous antibiotics, 3) Review synovial fluid analysis results to confirm the diagnosis, 4) Perform urgent surgical joint irrigation and debridement.
The correct sequence prioritizes obtaining an uncontaminated synovial fluid sample via arthrocentesis. Once the sample is secured, empiric antibiotics are started immediately to treat the suspected infection without delaying care. Fluid analysis (cell count and Gram stain) then confirms the diagnosis, which mandates urgent surgical irrigation and debridement to preserve joint cartilage.

Step-by-Step Solution

1
Identify the suspected diagnosis based on the clinical presentation.
The patient has an acute, hot, swollen, and severely painful joint with a fever, which is highly suggestive of septic arthritis.
Recognizing septic arthritis is critical because it is an orthopedic emergency that can rapidly destroy articular cartilage.
2
Determine the most critical initial intervention.
Diagnostic arthrocentesis must be performed first.
Obtaining synovial fluid before starting antibiotics is essential to isolate the offending pathogen and avoid sterilizing the culture, which would impede targeted antibiotic therapy later.
3
Decide the immediate next step after securing synovial fluid for culture.
Initiate empiric intravenous antibiotics.
Sepsis or systemic spread must be prevented, and local infection treated promptly while awaiting culture results.
4
Determine the definitive management after laboratory confirmation.
Review the fluid analysis, then proceed to surgical joint irrigation and debridement.
Purulent material must be mechanically washed out of the joint space to eliminate the source of infection and prevent irreversible enzymatic destruction of the joint.

Key Concept

In cases of suspected septic arthritis, diagnostic arthrocentesis must be performed prior to initiating empiric antibiotics, followed by surgical washout if the diagnosis is confirmed.
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Orthopedic Surgery

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