Background: Surgical resection of the diseased bowel in Crohn's disease is unfortunately not curative, and postoperative recurrence remains a problem in these patients.
Aim: To review the rates of and risk factors for clinical and endoscopic recurrence in population-based studies, referral centres and randomised controlled trials.
Methods: We searched MEDLINE (source PUBMED, 1966 to September, 2011).
Results: In randomised controlled trials, clinical recurrence in the first year after surgery occurred in 10-38% of patients, whereas endoscopic recurrence in the first year was reported in 35-85% of patients. In population-based studies, approximately half of patients experienced clinical recurrence at 10 years. In referral centres, 48-93% of the patients had endoscopic lesions (Rutgeerts' score ≥1) in the neoterminal ileum within 1 year after surgery, whereas 20-37% had symptoms suggestive of clinical recurrence. Three years after surgery, the endoscopic postoperative recurrence rate increased to 85-100%, and symptomatic recurrence occurred in 34-86% of patients. Smoking is the strongest risk factor for postoperative recurrence, increasing by twofold, the risk of clinical recurrence. Prior intestinal resection, penetrating behaviour, perianal disease and extensive bowel disease (>50 cm) are established risk factors for postoperative recurrence. Risk factors for postoperative recurrence remain poorly defined in population-based cohorts.
Conclusion: Endoscopic and clinical postoperative recurrence remains common in patients with Crohn's disease, and the identification of risk factors may allow targeted strategies to reduce this recurrence rate.
© 2012 Blackwell Publishing Ltd.