First degree |
Injury to perineal skin only |
Second degree |
Injury to perineum involving perineal muscles but not involving anal sphincter |
Third degree |
Injury to perineum involving anal sphincter complex |
3a: Less than 50% of external anal sphincter thickness torn |
3b: More than 50% external anal sphincter thickness torn |
3c: Both external anal sphincter and internal anal sphincter torn |
Fourth degree |
Injury to perineum involving anal sphincter complex (external anal sphincter and internal anal sphincter) and anal epithelium |
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