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On ultrasound, lipohemarthrosis—the presence of blood and fat in the joint cavity—is a key clinical indicator of an intra-articular fracture.
Lipohemarthrosis appears as three distinct layers near the joint line.
- Superficial Layer- hyperechoic fat with circular anechoic fat globules
- Middle Layer- Anechoic Serum
- Deep Layer- Slightly hyperechoic, representing clotted blood
References
Salerno A. Lipohemarthrosis. Floating fat in an intra-articular fracture. Visual Journal of Emergency Medicine. 2022, 26:101236.