RT Journal Article SR Electronic T1 U-shaped sacral fracture: an easily missed fracture with high morbidity. A report of two cases JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 677 OP 678 DO 10.1136/emj.2008.064972 VO 26 IS 9 A1 P Hussin A1 C Y W Chan A1 L B Saw A1 M K Kwan YR 2009 UL http://emj.bmj.com/content/26/9/677.abstract AB U-shaped sacral fracture is a very rare injury. This injury is easily missed and the diagnosis is often delayed as it is difficult to detect on the anteroposterior view of the pelvic radiograph. It is highly unstable and neurological injury is common. Two cases of U-shaped sacral fractures are reported here in which the diagnosis was delayed resulting in the late development of cauda equina syndrome. In these two cases, full recoveries were achieved following surgical decompression. A high index of suspicion with proper clinical and radiographic assessments will decrease the incidence of missed diagnosis and prevent the occurrence of delayed neurological deficits.