Urethral meatal stenosis or urethral stricture is a narrowing (stenosis) of the opening of the urethra at the external meatus (pronounced /miːˈeɪtəs/), thus constricting the opening through which urine leaves the body from the urinary bladder.
Studies have indicated that male circumcision contributes to the development of urethral stricture. Among circumcised males, reported incidence figures include 0.9%,[1] 2.8%,[2] 7.29%,[3] 9-10%,[4] and 11%.[5] In Van Howe’s study, all cases of meatal stenosis were among circumcised boys.[3] When the meatus is not covered by the foreskin, it can rub against urine soaked diapers resulting in inflammation and mechanical trauma.[4] Meatal stenosis may also be caused by ischemia resulting from damage to the frenular artery during circumcision.
http://www.ncbi.nlm.nih.gov/pubmed/16429216