This eponym refers to a an avulsion fracture of the lateral tibial plateau at the site of attachment of the lateral capsular ligament. It is frequently associated with tears of the anterior cruciate ligament (70 % predictive) or menisci.
AP radiograph of the knee. This shows an avulsion of the lateral tibial plateau. 
Sagittal MRI. This sequence of images of the knee shows disruption of the ACL. 
Hall FM, Hochman MG. Medial Segond-type fracture: cortical avulsion off the medial tibial plateau associated with tears of the posterior cruciate ligament and medial meniscus Skeletal Radiol. 1997 Sep;26(9):553-5 [Related
Artticles]