Fisurectomy and anoplasty with botulinum toxin injection in patients with chronic anal posterior fissure with hypertonia: a long-term evaluation

Chronic anal fissure’s (CAF) etiopathogenesis remain unclear. CAF of the posterior commissure (CAPF) are often characterized by internal anal sphincter (IAS) hypertonia. The treatment of this disease aimed to reduce IAS hypertonia. Due to the high rate of anal incontinence after LIS, the employment of sphincter preserving surgical techniques associated to pharmacological sphincterotomy appears more sensible. The aim of our study is to evaluate the long-term results of fissurectomy and anoplasty with V–Y cutaneous flap advancement associated to 30 UI of botulinum toxin injection for CAPF with IAS hypertonia. We enrolled 45 patients undergone to fissurectomy and anoplasty with V–Y cutaneous flap advancement and 30 UI botulinum toxin injection. All patients were followed up for at least 5 years after the surgical procedure, with evaluation of anal continence, recurrence rate and MRP (Maximum resting pressure), MSP (Maximum restricting pressure), USWA (Ultrasound wave activity). All patients healed within 40 days after surgery. We observed 3 “de novo” post-operative anal incontinence cases, temporary and minor; the pre-operative ones have only temporary worsened after surgery. We reported 3 cases of recurrences, within 2 years from surgery, all healed after conservative medical therapy. At 5 year follow-up post-operative manometric findings were similar to those of healthy subjects. At 5 years after the surgical procedure, we achieved good results, and these evidences show that surgical section of the IAS is not at all necessary for the healing process of the CAPF.