Identifying Landmark Factors of Anal Fistulas

The goal of this observational study is to understand the effects of anatomical factors, etiology, and complexity of anal fistula on the prognosis of patients undergoing anal fistula surgery within one year post-operation.The main question it aims to answer is: Which factors are indicative of the prognosis of anal fistula surgery? Which factors are landmark factors of anal fistulas? Participants who have already undergone anal fistula surgery at our hospital will receive outpatient and telephone follow-up to assess their prognosis.