INTRODUCTION: A de-functioning loop ileostomy (LI) reduces the consequences of anastomotic leak following low anterior resection, but its construction as well as its closure can be associated with complications. The aim of the present study was to identify risk factors for postoperative complications and particularly to determine if operation performed by trainees carry a higher risk of complications than operation performed by experienced surgeons. MATERIAL AND METHODS: This was a retrospective singlecentre analysis of the medical records of 159 consecutive patients who underwent LI closure following low anterior resection for rectal cancer in the period from January 2002 to December 2008. RESULTS: Postoperative complications developed in 32 patients (20.1%). Surgical complications occurred in 27 patients (17%) including small bowel obstruction in five (3%), anastomotic leak in four (2.5%), wound infection in eight (5%) and incisional hernia in eight (5%). There was no postoperative mortality. Univariate analysis showed that an increased rate of complications was associated with female gender (p = 0.02), small bowel resection at closure (p = 0.009) and a long interval between construction and closure of the loop ileostomy (p = 0.049). CONCLUSION: Closure of an LI is associated with a low mortality, but a relatively high rate of complications. Ope ration performed by trainees was not associated with an increased complication rate. More complications were seen in patients who underwent small bowel resection and those who had delayed ileostomy closure. FUNDING: not relevant. TRIAL REGISTRATION: not relevant.