A 35-year-old woman experiences a fourth-degree obstetric injury involving the anal sphincter complex and subsequently develops fecal incontinence. Her symptoms persist more than 6 months after childbirth. Endoanal ultrasonography reveals a 120-degree distal internal and external sphincter anterior defect. She is taken to surgery for overlapping sphincteroplasty. What is associated with mobilization of the sphincter beyond 180 degrees?
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