The narrowing can force bowel contents into fissures and ulcers at the site, causing additional damage and narrowing. The surgery restores free flow through the bowel without the need for removing bowel segments (i.e., without bowel resection).
The restriction can lead to bowel contents being pushed into cracks and ulcers at the site, causing more harm and constriction. The procedure restores smooth bowel flow without necessitating the removal of bowel segments (i.e., without bowel resection).