P538 Implementation of Kono-S anastomosis as a new standard of surgical care

Adamou, A.(1);Müller, G.(1);Iesalnieks, I.(1);

(1)Evangelisches Krankenhaus Kalk Cologne, Surgery, Cologne, Germany;


Background. The Kono-S ileocolic anastomosis is thought to reduce the risk of clinical and surgical recurrence in Crohn’s disease patients. The Kono-S anastomosis was established as a new standard of care at our institution in 2018, however, it was not performed in all patients. The present study describes the learning curve and reasons for hesitation to use the new technique.


Methods. Consecutive patients undergoing bowel resection with formation of ileocolic anastomosis since starting to use Kono-S technique were included in the present retrospective analysis. Intraabdominal septic complications (IASC) were peritonitis, anastomotic leak, intraabdominal fistula and abscess.


Results. Since starting to use Kono-S anastomosis, 90 patients underwent ileocolic resection (45M, 45F). However, during this period, conventional side-to-side ileocolic anastomosis was still performed in 26 patients (29%). Kono-S anastomosis was performed in 46% of cases during the first 6 months, in 76% during the next 6 months and in 82% of cases after the first year since implementation (p=0.005). There was no difference in postoperative IASC rate between patients with or without Kono-S anastomosis (2% vs. 4%, p=0.5). Also, postoperative overall complication rate, incidence of postoperative small bowel obstruction and length of postoperative hospital stay did not differ between groups. There were no anastomotic leaks. By the multivariate analysis, the presence of intraabdominal abscess or fistula (Hazard ratio 0.25, p=0.037) was the main reason to perform the conventional hand S/S anastomosis instead of new technique.


Conclusion. Some hesitation to use Kono-S anastomosis could be observed after the implementation of the new standard of care, especially during the first six months and in patients presenting with more complex intraabdominal findings. However, the learning curve has no impact on postoperative morbidity.