denis classification

Sacral Fractures

Mechanism

 

High energy usually

 

Occasionally osteoporotic fracture in elderly

 

Other

- radiotherapy

- fatigue fracture in children

 

Don't present as isolated injury

- associated with pelvic fracture

 

Denis Classification

 

Zone 1

- lateral to foramina

- neurologic injury from proximal migration & compression of L5 nerve root