neurology

Facet Joint Dislocation

Definition

 

Facet joint dislocations secondary flexion distraction injury

 

Epidemiology

 

10%

 

Stages

 

1. Unifacet subluxation - interspinous process widening

2. Unifacet dislocation - 25% anterolisthesis

3. Bifacet dislocation - 50% anterolisthesis

4. Complete vertebral translation - 100% anterolisthesis

 

Unilateral Facet Joint Dislocation

 

Cauda Equina

Definition

 

Compression of some or all of the nerve roots in the cauda equina

- bladder dysfunction

- bowel dysfunction

- saddle anaesthesia

- variable motor and sensory loss

 

Aetiology

 

HNP

- most common

 

Epidural haematoma

- post surgical

- spinals and anticoagulation