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Why is my knee fat?
A 42-year-old male presents to the ED with right knee pain that occurred one day ago after a mechanical fall directly onto the right knee. Pain is localized to the anterior aspect of the right knee and he has not been able to bear weight. Initial radiographs of right knee do not demonstrate any obvious bone abnormalities, but do show a significant joint effusion. You perform a point of care ultrasound on his knee while waiting for advanced imaging which is pictured below.
Why is my knee fat?
Author: Aaron Thomas
Peer-reviewer: Logan Danielson
Final editor: Sara Zagroba, William Denq
A 42-year-old male presents to the ED with right knee pain that occurred one day ago after a mechanical fall directly onto the right knee. Pain is localized to the anterior aspect of the right knee and he has not been able to bear weight. Initial radiographs of right knee do not demonstrate any obvious bone abnormalities, but do show a significant joint effusion. You perform a point of care ultrasound on his knee while waiting for advanced imaging which is pictured below.
Image 1: POCUS knee. Case courtesy of Dr. Maulik S. Patel, Radiopaedia.org, rID: 16066.
References:
[1] F Gaillard, H Knipe. Lipohemarthrosis. Reference article, Radiopaedia.org. (accessed on 16 Mar 2022) https://doi.org/10.53347/rID-
[2] TI Alves, G Girish, MK Brigido, JA Jacobson. US of the Knee: Scanning Techniques, Pitfalls, and Pathologic Conditions. RadioGraphics 2016 36:6, 1759-1775
[3] E Berlin, S Schaaf. Ultrasound Visualization of the Triple-Layer Sign of Lipohemarthrosis: Fat, Plasma, and Blood. American Journal of Physical Medicine & Rehabilitation: September 2021 - Volume 100 - Issue 9 - p e131-e132
[4] Prat-Fabregat, S., & Camacho-Carrasco, P. (2016). Treatment strategy for tibial plateau fractures: an update, EFORT Open Reviews, 1(5), 225-232.
[5] A von Keudell, K Shoji, M Nasr, R Lucas, R Dolan, M Weaver. Treatment Options for Distal Femur Fractures, Journal of Orthopaedic Trauma: August 2016 - Volume 30 - Issue - p S25-S27
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