Which mechanism commonly causes injury to the bladder or urethra?

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Straddle injuries crush the perineal region directly, which forces the urethra, especially the bulbar portion that runs across the perineum, to tear or rupture as it is relatively fixed and close to the pelvic bones. This perineal compression is a classic mechanism that injures the urethra and can also jeopardize the bladder neck when the bladder is full or compressed against the pelvic structures. Other mechanisms listed—gunshot wounds, blunt trauma elsewhere, or concussion—don’t consistently produce this targeted perineal crush injury to the bladder or urethra.