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International audience; BACKGROUND: The most effective treatment for anal fistula is fistulotomy, but it involves a risk of anal incontinence. To reduce this morbidity, sphincter-sparing treatments have been developed, but their success in real life is often less than 50%. The aim is to determine clinical healing rate 6 months after radiofrequency treatment. PATIENTS AND METHODS: We planned to evaluate 50 patients from 3 French proctology centres. Treatment efficacy was evaluated at 6 and 12 months by means of clinical and magnetic resonance imaging examination. We evaluated morbidity and healing prognostic factors. RESULTS: Fifty patients with a mean age of 51years [22-82] were included. Eleven patients had a low transsphincteric fistula(LTS), 21 high transsphincteric fistula(HTS), 8 complex fistula and 9 Crohn’s disease fistula. After 6 months, 17 patients (34.7%) had a clinically healed fistula, including 5 (45.5%) with LTS fistula, 7 (33.3%) with HTS fistula, 1 (12.5%) with complex fistula, 4 (44.4%) with Crohn’s disease, with no significant difference between these fistula types (p:0.142). At 12 months, the healing rate was identical. MRI in 15 out of 17 clinically healed patients showed a deep remission of 73.3% at 12 months. Energy power was associated with the success of the treatment. There was an 8.2% incidence of post-surgical complications with 4.1% being abscesses (one required surgical management). Postoperative pain was minor. No new cases or deterioration of continence have been shown. CONCLUSION: Radiofrequency is effective in less than 50% of the cases as an anal fistula treatment in this first prospective study, with low morbidity and no effect on continence. Clinical healing was deep (MRI) in ¾ at 1 year. The increase in energy power during the procedure seems to be a key point to be analysed to optimise results.

Clinical trial registration: ClinicalTrials.gov Identifier NCT01388257; International audience; Aim In patients with fistulizing perianal Crohn's disease (CD), the need for a secondary surgical step is not defined. The aim was to assess the efficacy of surgical closure compared to a single seton removal in patients with drained fistulizing perianal CD treated with adalimumab. Methods This was a multicentre, randomized controlled trial, comparing seton removal + surgical closure (closure group) to seton removal alone (control group) with a stratification according to the American Gastroenterological Association classification. The primary end-point was fistula closure at month 12 defined by the association of the following criteria: no seton, absence of a visible external opening, absence of discharge from the tract after finger compression, absence of an internal opening, absence of perianal pain/abscess and absence of fistula-related abnormalities. Results Among the 64 included patients (262 expected) (48 complex fistula, 75%), 33 were randomized to the closure group and 31 to the control group. In the closure group, 26 patients (78.8%) had glue. At month 12, overall fistula closure was achieved in 35 of the evaluable 58 patients (60%): 18/32 (56%) in the surgery group and 17/26 (65%) in the control group (P = 0.479). In the closure group, fistula closure was observed in 13/25 (52%) and 5/7 (71%) patients with complex and simple fistula respectively (P = 0.426), compared with 12/18 (67%) and 5/8 (63%), respectively in the control group (P = 1.000). Conclusions Seton removal alone seems to be no more effective than a secondary surgical step (in particular glue injection) in patients having fistulizing perianal CD controlled by an initial drainage combined with adalimumab. The results should be interpreted with caution.