*24-year-old male with history of fall from motorcycle and severe pain in the knee.
What is the most likely diagnosis?
Answer
Answer:
Lipohaemarthrosis
Case Discussion:
CT images of the knee revealed a displaced fracture of the distal femur and lipohemarthrosis with a fat-fluid interface.
Lipohaemarthrosis results from an intra-articular fracture with escape of fat and blood from the bone marrow into the joint. It is most frequently seen in the knee, associated with a tibial plateau fracture or distal femoral fracture; rarely a patellar fracture. They have also been described in hip, shoulder, and elbow fractures.
References:
1. Lee JH, Weissman BN, Nikpoor N et-al. Lipohemarthrosis of the knee: a review of recent experiences. Radiology. 1989;173 (1): 189-91.
2. Costa DN, Cavalcanti CF, Sernik RA. Sonographic and CT findings in lipohemarthrosis. AJR Am J Roentgenol. 2007;188 (4): W389.