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Definition of perineal trauma [2]
| Degree | Trauma to Perineum |
|---|---|
| First degree |
Laceration of vaginal epithelium or perineal skin |
| Second degree |
Involvement of perineal muscles, not anal sphincter |
| Third degree |
Disruption of anal sphincter muscles – |
| 3a: <50% external sphincter torn | |
| 3b: >50% external sphincter torn | |
| 3c: external and internal sphincter torn | |
| Fourth degree | Third degree tear with rupture of trauma to anal epithelium |
