How do they use ultrasound to evaluate fecal incontinence?

Sphincter eval: Still somewhat experimental but some docs are able to visualize the anal sphincter with u/s to evaluate for whether it is intact.

Ultrasound: Endoanal ultrasound is common. A specialized prob is inserted into the rectum and ultrasound images are obtained to evaluate the muscles of the anal sphincter . If defects are noted they may be repaired