| Classification | Description | Notes |
| AP Compression | Widened pubic symphysis, widened anterior SI joints | If pure ligamentous injury, may not have fractures |
| Lateral Compression | Sacral fracture, horizontally oriented superior pubic ramus fracture | |
| Windswept Pelvis | AP compression on one side, lateral compression on the other side | |
| Vertical Shear | Disrupted symphysis, sacral fracture or disrupted SI joint allowing one hemipelvis to displace superiorly | Associated with fall from height, landing on one leg |
References:
Khurana, B., et al. (2014). “Pelvic ring fractures: what the orthopedic surgeon wants to know.” Radiographics 34(5): 1317-1333.
Young JW, Burgess AR, Brumback RJ, Poka A. (1986). “Pelvic fractures: value of plain radiography in early assessment and management.” Radiology 160(2): 445–451.