What is it? A septic knee is an infection within the joint of the knee.
How does it present? A septic knee often presents with knee pain, swelling and many times with redness and warmth. Systemic symptoms such as fever and chills may also be present. Diabetics and other immunocompromised patients are at greater risk.
Common exam findings: Effusion, erythema, warmth, and tenderness can be elicited on exam. Other findings may be nonspecific, but include difficulty with weight bearing and decreased range of motion.
Tests and treatment: An x-ray should be performed to look for evidence of osteomyelitis, but an aspiration and evaluation of joint fluid is necessary to evaluate for infection. Treatment depends on suspected cause of infection, but usually requires parenteral antibiotics.