IOTW: Knee effusion

Posted on: November 25, 2019, by :

A 16yo F presented for 1 week of right knee pain and 2 days of knee swelling. POCUS of the knee was performed which revealed a knee effusion.

Knee effusions will present as fluid under the tendon. If fluid is visualized above the tendon, then other diagnoses such as cellulitis, abscess, hypoproteinemia, hematoma, etc should be considered. Fluid will usually be seen superiorly as in this patient.

Normal knee
Superior, longitudinal
Normal knee
Superior, longitudinal
Knee with effusion
Superior, longitudinal
Knee with effusion
Superior, longitudinal
Knee with effusion
Superior, transverse
Knee with effusion
Superior, transverse

Mary Kate Claiborne

Pediatric Emergency Medicine Attending at Children's National Medical Center
Mary Kate is from Augusta, Georgia. She attended Notre Dame for undergrad and then quickly returned to the warm weather in the South, attending medical school in Savannah, Georgia. She completed residency at University of Texas at Houston and PEM fellowship at Phoenix Children's Hospital. She is currently working as a PEM attending while also completing an ultrasound fellowship at CNMC. In her free time, Mary Kate enjoys running, tennis, cooking, spin class, coffee, and visiting family.
Mary Kate Claiborne

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