To learn the causes and imaging presentations of bone marrow edema (BME) in the knee,
revisiting several MRI cases. Several cases from the authors practices will be presented,
grouped according to the edema mechanisms as adapted from the original classification by Eustace.
Bone marrow edema represents an increase in interstitial fluid,
as such it has the MR characteristics of increased water content,
namely a low/intermediate signal on T1-weighted images and a high signal on T2 and PD-weighted images.Water sensitive sequencessuch as short-tau inversion recovery (STIR) imagingarevery sensitive in detecting bone marrow edema as it appears hyperintense compared with normal bone marrow. Following intravenous gadolinium administration minimal delayed...
Findings and procedure details
Below we present a listing of several entities associated with bone marrow edema of the knee,
arranged according to the pathophysiology of the edema for each case (slightly adapted from the first classification described by Eustace).
Several examples collected from our practice are used to illustrate and further discuss these entities: 1.
Traumatic/Degenerative a. Osteoarthritis ( Fig. 2 ) b. Acute Trabecular Microfractures ( Fig. 7 , Fig. 8 , Fig. 9 , Fig. 10 , Fig. 11 ) c. Stress Fatigue...
Knee bone marrow edema is a very common finding on MRI scans.
its pathophysiology it’s not as simple as one could imagine as there are several different mechanisms through which it can develop.
For each of these mechanisms there is a specific set of possible underlying diseases,
some with a very characteristic distribution pattern.
Having this knowledge is highly helpful in narrowing down differential diagnosis and not missing common associated injuries.
José Saraiva 1 André Teixeira Gomes1 Carlos Bilreiro1 Ana Rita Ventosa1 Rodrigo Monteiro1 Bruno Santos1 Miguel Oliveira eCastro1 1. Serviço de Radiologia Centro Hospitalar e Universitário do Algarve Largo do Poço Seco 8500-338 Portimão PORTUGAL
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2006;10:249–257. 3. Sanders .TG. et al , Bone Contusion Patterns of the Knee at MR Imaging: Footprint of the Mechanism of Injury, Radiographics,
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S135-51 4. Helms C.A. et al...