| RSD Category | |
| I | Immediate - beginning within first 48 hours of event |
| II | Early - beginning 1 to 12 weeks from the initial event |
| III | Late - after 3 months, or with late trophic changes |
| Betcher's Classification of RSD | |
| 1 | Pain, edema, vasomotor changes |
| 2 | 1 + Pain aggravated by motion |
| 3 | 2 + Trophic changes |