The Young-Burgess classification system is based on mechanism of injury: anteroposterior compression type I, II and III, lateral
compression types I, II and III, and vertical shear, or a combination of forces.

Lateral compression (LC) fractures involve transverse fractures of the pubic rami, either ipsilateral or contralateral to a posterior injury.

Grade I – Associated sacral compression on side of impact
Grade II – Associated posterior iliac ("crescent") fracture on side of impact
Grade III – Associated contralateral sacroiliac joint injury
The most common force type, lateral compression (LC) forces, from side-impact automobile accidents and pedestrian injuries, can result in an internal rotation.
The superior and inferior pubic rami may fracture anteriorly, for example.
Injuries from shear forces, like falls from above, can result in disruption of ligaments or bones.
When multiple forces occur, it is called combined mechanical injury (CMI).
The best imaging modality to use for this classification is probably a pelvic CT scan.
The Young-Burgess classification system is based on mechanism of injury: anteroposterior compression type I, II and III, lateral
compression types I, II and III, and vertical shear, or a combination of forces.
Lateral compression (LC) fractures involve transverse fractures of the pubic rami, either ipsilateral or contralateral to a posterior injury.
Grade I – Associated sacral compression on side of impact
Grade II – Associated posterior iliac ("crescent") fracture on side of impact
Grade III – Associated contralateral sacroiliac joint injury
The most common force type, lateral compression (LC) forces, from side-impact automobile accidents and pedestrian injuries, can result in an internal rotation. The superior and inferior pubic rami may fracture anteriorly, for example. Injuries from shear forces, like falls from above, can result in disruption of ligaments or bones. When multiple forces occur, it is called combined mechanical injury (CMI). The best imaging modality to use for this classification is probably a pelvic CT scan.
Pelvic fracture