Related Experiment Video
Updated: Jun 17, 2026
Application of a New Mesh Fixation Method in Laparoscopic Incisional Hernia Repair
Published on: December 23, 2022
Pediatric abdominal injury patterns generated by lap belt loading
Stephen Stacey1, Jason Forman, William Woods
1Center for Applied Biomechanics, University of Virginia, Charlottesville, Virginia 22902, USA.
Insights
Seat belt position in car crashes significantly impacts pediatric abdominal injuries. Upper belt placement causes spleen and rib injuries, while lower placement affects intestines. The "seat belt sign" helps identify internal trauma.
Area of Science:
- Pediatric trauma research
- Biomechanics of injury
- Automotive safety engineering
Background:
- Child occupants are at risk of abdominal injuries from adult seat belts in motor vehicle crashes.
- The relationship between seat belt position and specific injuries in children is not well-understood.
Purpose of the Study:
- To quantify the relationship between lap belt position and abdominal injuries in a pediatric model.
- To evaluate the predictive value of the
Main Methods:
- Conducted 34 dynamic crash tests using a validated porcine model simulating a 6-year-old's abdomen.
- Varied lap belt position to either the upper or lower abdomen.
- Performed necropsies to identify and correlate injuries with belt position; assessed the utility of abdominal abrasions as injury predictors.
Main Results:
- Significant differences in injury patterns were observed between upper and lower abdominal belt loading (p < 0.01).
- Upper abdominal loading resulted in splenic lacerations and rib fractures; lower loading caused intestinal injuries.
- Abdominal abrasions were specific (0.86) but not sensitive (0.33) for moderate internal injuries.
Conclusions:
- Injury patterns differ based on lap belt placement in pediatric vehicle occupants.
- The "seat belt sign" is more useful for ruling in than ruling out occult abdominal trauma in children.
- Clinicians can use injury patterns and the "seat belt sign" to evaluate children with potential abdominal trauma after crashes.
Background:
Abdominal injuries can occur in children wearing adult seat belts during motor vehicle crashes. The particular anatomic structures injured may depend on the position of the seat belt, but this relationship has never been quantified in a controlled setting.
Methods:
Thirty-four dynamic tests, designed to replicate crash loading, were performed on a validated porcine model of the 6-year-old human abdomen. The lap belt was positioned initially at either an "upper" or "lower" location on the abdomen. Detailed posttest necropsies identified all resulting injuries, which were then correlated to the initial position of the seat belt. The utility of using the presence or absence of an abdominal abrasion to predict internal abdominal injuries was also investigated.
Results:
The injury frequency distributions from upper and lower abdominal belt loading were found to be significantly different (p < 0.01). Upper abdominal loading most commonly produced splenic lacerations and rib fractures, whereas lower abdominal loading resulted primarily in injuries to the large and small intestines. The presence of an abdominal abrasion was found to be a fairly specific (Sp = 0.86) but not very sensitive (Sn = 0.33) predictor of internal injuries of moderate severity.
Conclusions:
The relative frequency of each injury coupled with the presence or absence of an abdominal abrasion ("seat belt sign") should aid clinicians during their evaluations of children involved in motor vehicle crashes with possible occult abdominal trauma. In addition, the presence of a seat belt sign may have greater utility ruling in potentially occult abdominal injuries rather than excluding them.
Related Concept Videos
01:19Appendicitis
01:22Appendicitis-I: Introduction
Etiology: Appendicitis can arise from various causes, primarily rooted in the obstruction of the appendix lumen. Factors contributing to this obstruction include fecal accumulation, lymphoid hyperplasia and, in...