 In this pilot study a new surgical treatment approach for perianal fistulae, called Fistulodesis, is performed. The study aims to assess effectiveness, safety and tolerability of the Fistulodesis procedure. The investigators are aiming to include 20 patients with Crohns disease and 20 patients without underlying Crohns disease. It is an open label study with an anticipated duration from January 2017 to January 2020. 