[Crohn's disease--Indication for surgery (author's transl)].

60 to 90% of patients with Crohn's disease have to undergo surgery due to complications; one half of these patients do suffer a relapse. Comments are given as to the rate of recurrence and the factors which may influence it (age, localisation and duration of the disease, timing and technique to surgery). The absolute and relative indications for surgery as well as preoperative preparation are discussed in detail. Optimal therapy of Crohn's disease is only possible in close cooperation between gastroenterologist and surgeon.