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Yes ,there are other treatments available to treat anal fistula.However the basic plan and managemnt depends upon the location of fistula and the strength of the sphincter muscles.One option is seton placement.Seton is a silk string that also help the drainage of fistula.In this procedure surgeon create scar tissue around part of the sphincter muscle before cutting it .Allow the seton to slowly cut all the way through the muscle over the course of several weeks.This increases healing of fistula.In another procedure a doctor may use fibrin glue whic is made up of plasma protein, to seal up and heal a fistula rather than cutting it open. The doctor injects the glue through the external opening after clearing the tract and stitching the internal opening closed. The fistula tract can also be sealed with a plug of collagen protein and then closed.
So if the suture is not acceptable for you then you can discuss these options with your surgeon .But normally all the surgeons prefer to do fistulotomy and placement of suture as its done on you.
Wish you good health,