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
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