Preservation of rectal function after low anterior resection with formation of a neorectum.

Recent advances in surgery have enabled low rectal cancers to be resected, while at the same time restoring bowel continuity and preserving the anal sphincter. Although a permanent stoma is avoided and the operation is oncologically sound, function may be compromised. Many patients with a straight coloanal anstomosis suffer from urgency, incontinence, and bowel frequency-the so-called anterior resection syndrome. Over the last 15 years, surgical developments have aimed at improving function after restoration of bowel continuity, essentially by creating a neorectum. The best known and most widely practiced operation involves formation of a colonic J-pouch. The physiological and functional outcomes of the colonic J-pouch are discussed, along with controversies surrounding construction. Although a J-pouch improves some aspects of function, the results are not perfect. Alternatives to the colonic J-pouch are appraised, indicating future areas of development.