bone bruise

Bone bruises (also known as bone contusion, trabecular microfracture) are an osseous injury that results from compression of bone structures.

Pathology

Bone bruises represent trabecular microfractures with hemorrhage and without a discrete fracture line or contour abnormality . They typically appear within 48 hours of injury and can persist for up to six months .

Etiology

Most bone contusions are a result of a direct blow to the bone, traction from avulsion trauma, or load to a subchondral surface . Depending on where bone contusion is seen, the underlying trauma mechanism can be identified.

Complications

They can progress to osteochondritis dissecans .

Radiographic features

Plain radiograph

Plain radiography will not demonstrate cancellous features but can show regions of impaction, for example, a Hill-Sachs lesion .

MRI

MRI is the modality of choice when investigating bone marrow. Bone (marrow) contusion is typically focal and ill-defined with the following signal characteristics :

• T1: focal hypointense area of bone marrow
• T2 fat-saturated: focal hyperintense area of bone marrow

See also

• patterns of bone bruise in knee injuries

Siehe auch:

• Fraktur

und weiter:

• Contre-coup-Verletzung am Kniegelenk
• posteromediale Verletzungen am Kniegelenk
• contusion vertebral