Timing of surgery for urethral strictures bulbous urethral strictures: 3 months after the injury and no urethral dilatation operation within the last 1 month Membranous urethral stricture: 6 months after injury, no urethral dilatation operation within the last 1 month Urethral dilatation bleeding, re-injury of the urethral mucosa, and local scarring aggravated by repeated urethral dilatation bleeding. For patients with dilatation bleeding, it is recommended to leave a urinary catheter in place for 2 weeks. In addition forced dilation tends to form a false tract. So for urethral stricture surgery patients, there should not be urethral dilation operation in the last 1 month.