Q16
Single choice
A 31-year-old (gravida 1, para 1) female had a forceps-assisted vaginal delivery 3 months ago. Her infant weighed 4250 g. During the delivery she sustained a fourth degree perineal injury that was repaired. She now complains of fecal incontinence and foul vaginal discharge when her stools are loose, which happens several days a week.
The most likely etiology for her fecal incontinence and foul vaginal discharge would be which of the following?