Anastomotic failure: the dance between microbial virulence, structure, and perfusion

A meticulous rectal anastomosis is a pillar of modern colorectal surgery. Anastomotic leak (AL) is the most dreaded of complications for colorectal surgeons, with contemporary rates of 5–10% that have proven resistant to advances in operative technique and technology1,2. Efforts to reduce AL have largely centred on refinement of mechanical construction through stapling devices or optimization of tissue perfusion with fluorescence angiography. Yet, high-quality evidence suggests that these strategies have delivered only modest gains3–5. This persistent gap between innovation and outcome implies the current conceptual model of anastomotic failure remains incomplete.