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Table 2 Classification of Injury[32]

From: Management of obstetric anal sphincter injury: a systematic review & national practice survey

Injury Definition
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 (EAS and IAS)
  3a : Less than 50% of EAS thickness torn
  3b : More than 50% of EAS thickness torn
  3c : IAS torn
Fourth Degree Injury to the perineum involving the anal sphincter complex (EAS and IAS) and rectal mucosa.