Lumbar transverse process fractures--a sentinel marker of abdominal organ injuries.

Fractures of lumbar vertebrae may be associated with abdominal organ injuries. Lumbar transverse process fractures are commonly thought of as minor injuries compared with body, pedicle and lamina fractures. To determine the significance of transverse process fractures as opposed to other lumbar vertebral fractures in relation to abdominal organ injury, a retrospective study was performed. One hundred and ninety-one patients with lumbar spine fractures were reviewed. One hundred and thirty-five (71%) of these had non-transverse process (NTP) fractures only (including vertebral body, pedicle, or spinous process fractures). Fourty-two patients (22%) had transverse process fractures only. Fourteen patients (7%) had both transverse process and NTP fractures. Twenty (48%) of the 42 patients with transverse process fractures had abdominal organ injuries identified. This was a significantly (P<0.05) higher rate than for the patients with NTP fractures, eight of 135 (6%). Patients with transverse process fractures and abdominal organ injuries had a median injury severity score (ISS) of 29 compared with a median ISS of 17 for patients with NTP fractures and abdominal organ injuries. If a transverse process has been fractured, there is likely to have been very large forces involved in the incident. The data strongly suggest that lumbar transverse process fractures should not be thought of as minor injuries but regarded as a significant marker for abdominal organ injuries and should alert the doctor caring for the injured patient of the high probability of these injuries.