The Magnetic resonance imaging(MRI) is accepted as a useful tool for the diagnosis of injury of the knee recently. The bone bruise bruise is found on magnetic resonance imaging as bone signal change that is not found on the simple radiograph. The
bone bruise represents trpresents tradecular fractures, hemorrhage, and edema of the bone marrow without disruption of the cortex, and cannot be detected with conventional radiography. The criteria of decreased signal intensity on the T1 weighted
image and increased signal intensity on the T2 weighted image were applied for the assessment of the bone bruise. From Jan. 1991 to Dec. 1995, MRI was performed on 78 patients with suspicious injury in meniscus or ligament structure of the knee. The bone
bruises were documented in 122 of the 78 patients928%) with suspicious ligament injury. Of the 22 patients with bone bruise, 80% had lesions of the lateral compartment. The most common associated ligament injury with bone bruise is the medial collateral
ligament(72%), and the next is the anterior cruciate ligament(41%). The most important consideration in bruise is an association with ligamentous injuries, and the detection of the bone bruise is very importnat in meticulous evaluation of ligamentous injuries.
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