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Table 1 Classification of perineal trauma

From: PErineal Assessment and Repair Longitudinal Study (PEARLS): protocol for a matched pair cluster trial

First degree: Injury to skin only
Second degree: Injury to the perineum involving perineal muscles but not involving the anal sphincter
Third degree: Injury to the perineum involving the anal sphincter complex;
3a < 50% of external anal sphincter (EAS) thickness torn;
3b > 50% of EAS thickness torn;
3c Internal anal sphincter (IAS) torn
Fourth degree: Injury to perineum involving the anal sphincter complex (EAS and/or IAS) and anal epithelium
  1. RCOG Green Top Guideline 23. Methods and Materials Used in Perineal Repair. Kettle C, O'Brien PMS.