S31.02 - Laceration with foreign body of lower back and pelvis S31.0 - Open wound of lower back and pelvis S31.02 - Laceration with foreign body of lower back and pelvis S31.020 - Laceration with foreign body of lower back and pelvis without penetration into retroperitoneum S31.021 - Laceration with foreign body of lower back and pelvis with penetration into retroperitoneum