neurology

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

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