This study is a prospective, randomized controlled trial designed to compare two surgical techniques for stoma creation in patients undergoing colorectal surgery. The trial evaluates whether an extraperitoneal stoma created via the arcuate line approach can reduce the risk of developing parastomal hernia compared to the conventional transperitoneal stoma formation. Parastomal hernia is a common complication after stoma surgery, often requiring additional treatment or surgery. By testing a novel surgical route that avoids entering the abdominal cavity, this study aims to improve postoperative outcomes and quality of life for patients requiring a permanent stoma.

Parastomal hernia (PSH) is one of the most common long-term complications following stoma creation, with incidence rates reported as high as 30-50%. Conventional stoma formation typically uses a transperitoneal route, which may leave potential gaps in the abdominal wall through which herniation can occur.

Recent anatomical and surgical advances have proposed the arcuate line approach for extraperitoneal stoma creation, allowing the stoma to be tunneled outside the peritoneal cavity while preserving abdominal wall integrity. However, robust prospective evidence supporting its clinical benefits remains limited.

This randomized controlled trial will compare the arcuate line extraperitoneal approach with the traditional transperitoneal method, focusing on the incidence of parastomal hernia as the primary outcome. Secondary outcomes include postoperative complications, operative time, stoma function, and quality of life.

The results may provide high-level evidence to guide best practices in stoma surgery.

Inclusion Criteria:

• Age 18-80 years
• Scheduled for laparoscopic abdominoperineal resection

Written informed consent

Exclusion Criteria:

• Previous abdominal wall hernia

Emergency surgery

Severe comorbidities prohibiting safe surgery

Prior lower abdominal surgery affecting stoma site