Articular process fractures
Articular process fracture
Natural history
Superior articular process fracture
- potentially unstable
Inferior articular process fracture
- thought to be more stable
CT scan
Superior articular process fracture
- potentially unstable
Inferior articular process fracture
- thought to be more stable
Bilateral Pars Fracture C2
- traumatic axis spondylolisthesis
Neurological injury uncommon
- fragments separate and decompress
Different to judicial hanging where spinal cord is severed
Wear
Stability
Normal feel of hip
Increased ROM
Large head
- increase volumetric wear
- less penetrative / linear wear
Small head
- increased linear wear
- decreased volumetric wear
Type I: Undisplaced avulsion fracture
Type II: Anterior portion displaced & hinged
Type IIIA: Displaced
Type IIIB: Displaced & Rotated