The lateral compression injury of the pelvis is common in high-speed vehicle accidents, and symphysis pubis disruption can occur with external rotation or anterior compression injury. The most common injury of the symphysis pubis is diastasis. So far, four cases of the locked symphysis pubis have been reported, and two of these were treated by closed reduction. The current case involves a 26-year-old man who experienced a lateral compression force to his pelvis and knees, and suffered a symphysis pubis disruption (locked symphysis pubis, i.e., creeping of the left pubic body below the right pubic body), urethral rupture and bilateral knee dislocation. The locked symphysis pubis was successfully reduced with a closed maneuver.