Methods Forty-two cases in treatment group were treated with sphincter-retaining and thread-dragging therapy and another 42 cases were treated with fistulectomy.

• 方法对42例复杂性肛瘘患者施行保留括约肌挂线法手术治疗（治疗组），并与42例瘘管切除术治疗（对照组）比较。