Evaluation of pelvic fractures. Clinical and radiologic

Immobilisation du bassin par contention externe dans la prise en charge des traumatisés sévères : évaluation des pratiques professionnelles

Introduction : En traumatologie, la ceinture pelvienne stabilise le bassin en réduisant le volume pelvien, ce qui permet de tamponner l’hémorragie. L’objectif principal de l’étude était d’évaluer le respect des indications théoriques de pose de ceinture pelvienne dans la prise en charge des traumatisés sévères en préhospitalier.

Méthode : Une étude rétrospective, monocentrique, observationnelle a été réalisée en 2017–2018 afin d’évaluer les pratiques professionnelles en termes de respect des indications d’immobilisation et la fiabilité de l’évaluation clinique. Les critères d’inclusion étaient les interventions prenant en charge des patients pour accident de la route ou chute. L’analyse de la concordance entre pose de ceinture pelvienne et indication théorique a été réalisée avec un test du kappa de Cohen. L’intensité de la liaison entre cette évaluation et la confirmation d’une fracture par tomodensitométrie a été analysée par le coefficient Q de Yule.

Résultats : Cent soixante-seize dossiers ont été analysés, dont 98 ont été inclus dans l’étude. La ceinture a été posée chez 26 % d’entre eux. Le coefficient d’agrément kappa de Cohen était de à 0,08, avec un pourcentage d’agrément de 57 %. L’intensité de la liaison entre l’évaluation clinique et la présence d’une fracture à la tomodensitométrie était très forte avec un coefficient de Q de Yule calculé à 0,92.

Conclusion : Il n’y avait pas d’agrément entre l’indication théorique et la décision de poser la ceinture démontrant un recours insuffisant à la contention pelvienne lors de la prise en charge des patients traumatisés sévères en préhospitalier.

Haemodynamics as a determinant of need for pre-hospital application of a pelvic circumferential compression device in adult trauma patients

INTRODUCTION

Pelvic ring fractures are common following high-energy blunt trauma and can lead to substantial haemorrhage, morbidity and mortality. Pelvic circumferential compression devices (PCCDs) improve position and stability of open-book type pelvic fracture, and can improve haemodynamics in patients with hypovolaemic shock. However, PCCDs may cause adverse outcomes including worsening of lateral compression fracture patterns and routine use is associated with high costs. Controversy regarding indication of PCCDs exists with some centres recommending PCCD in the setting of hypovolaemic shock compared to placement for any suspected pelvic injury.

OBJECTIVE

To assess the need for PCCD application based on pre-hospital vital signs and mechanism of injury.

METHODS

A retrospective cohort study was conducted in a single adult major trauma centre examining a 2-year period. Patients were sub-grouped based on initial pre-hospital and emergency department observations as haemodynamically normal (heart rate <100 bpm, systolic blood pressure ≥100 mmHg and Glasgow Coma Scale ≥13) or abnormal. Diagnostic accuracy of pre-hospital haemodynamics as a predictor of pelvic fracture requiring intervention within 24 h was assessed.

RESULTS

There were 376 patients with PCCD in-situ on hospital arrival. Pelvic fractures were diagnosed in 137 patients (36.4%). Of these, 39 (28.5%) were haemodynamically normal and 98 (71.5%) were haemodynamically abnormal. The most common mechanisms of injury were motor vehicle collision (57.7%) and motorcycle collision (13.8%). Of those with fractures, 40 patients (29.2%) required pelvic intervention within 24 h of admission; of these, 8 (20%) were haemodynamically normal and 32 (80%) were haemodynamically abnormal. As a test for pelvic fracture requiring intervention within 24 h, abnormal pre-hospital haemodynamics had a sensitivity of 0.80 (95% CI 0.64-0.91), specificity of 0.32 (95% CI 0.27-0.38) and negative predictive value (NPV) of 0.93 (95% CI 0.88-0.96). Combined with absence of a major mechanism of injury, normal haemodynamics had a sensitivity 1.00, specificity 0.51 (95% CI 0.36-0.66) and NPV of 1.00 for pelvic intervention within 24 h.

CONCLUSION

Normal haemodynamic status, combined with absence of major mechanism of injury can rule out requirement for urgent pelvic intervention. Ongoing surveillance is recommended to monitor for any adverse effects of this change in practice.

Emergency radiological examination of the externally stabilized pelvis--there is a catch to it: lessons learned from two cases with symphyseal disruption despite initial inconspicuous computed tomography

BACKGROUND

Preclinical and early clinical external pelvic stabilization using commercially available devices has become common in trauma patient care. Thus, in the emergency department an increasing number of patients will undergo radiographic evaluation of the externally stabilized pelvis to exclude injuries. While reports exist where injuries to the pelvis were elusive to radiological examination due to the pelvic immobilization we elaborate on an algorithm to remove an external pelvic stabilizing device, prevent delayed diagnosis of pelvic disruption and thus increase patient safety.

CASE PRESENTATION

We report on two patients with external pelvic stabilization presenting with an inconspicuous pubic symphysis on initial pelvic computed tomography scans. The first patient was an otherwise healthy 51-year old male being run over by his own car. He received external pelvic stabilization in the emergency department. The second patient was a 36-year old male falling from a ladder. In this patient external pelvic stabilization was performed at the scene. In the first patient no pelvic injury was obvious on computed tomography. In the second patient pelvic fractures were diagnosed, yet the presentation of the pubic symphysis appeared normal. Nevertheless, complete symphyseal disruption was diagnosed in both of them upon removal of the external pelvic stabilization and consequently required internal fixation.

CONCLUSION

Based on our experience we propose an algorithm to "clear the initially immobilized pelvis" in an effort to minimize the risk of missing a serious pelvic injury and increase patient safety. This is of significant importance to orthopedic trauma surgeons and emergency physicians taking care of injured patients.

An overview of pelvic ring disruption

Pelvic ring disruption after trauma is uncommon, occurring in 20–37/100,000 people in the general population. However, in high velocity poly trauma up to 20% of cases have this injury contributing significantly to morbidity and mortality. The management of pelvic and acetabular trauma has become a subspecialty within the orthopaedic trauma care. The injury patterns are now better understood, there is agreement on a classification system and operative stabilisation has become a viable treatment option.

The prehospital management of pelvic fractures

Pelvic fractures are one of the potentially life-threatening injuries that should be identified during the primary survey in patients sustaining major trauma. Early suspicion, identification and management of a pelvic fracture at the prehospital stage is essential to reduce the risk of death as a result of hypovolaemia and to allow appropriate triage of the patient. The assessment and management of pelvic fractures in the prehospital environment is reviewed here. It is advocated that the pelvis should not be examined by palpation or springing, and that the patient should not be log rolled. Pelvic immobilisation should be used routinely if there is any suspicion of pelvic fracture based on the mechanism of injury, symptoms and clinical findings.

Pelvic trauma in rapidly fatal motor vehicle accidents

OBJECTIVE

To study the incidence and nature of pelvic fractures in rapidly fatal automobile accidents.

DESIGN

Retrospective.

SETTING

County Medical Examiner's Office.

PATIENTS

The files of 255 consecutive motor vehicle accident fatalities examined at the Jefferson County Coroner/Medical Examiner's office (study period 1996-1998) were reviewed. We correlated this information with our previous findings, derived from a review of 392 such cases (study period 1994-1996).

RESULTS

Approximately 25% of decedents involved in rapidly fatal automobile accidents sustained pelvic fractures. In 93% of the cases, postmortem radiographs were available and suitable for scoring according to the Orthopaedic Trauma Association nomenclature. The distribution of pelvic fractures by type was type A, 16%; type B, 32%; and type C, 52%, with the most common pelvic fracture being type C1 (26%). Additionally, pedestrians and motorcyclists were twice as likely to sustain a pelvic fracture, and the severity of pelvic fracture type seemed to correlate with increasing speed of the automobile. No correlation between drug use or direction of impact and incidence or type of pelvic fracture was observed. Compared with published studies on survivors of automobile accidents, our data suggest that pelvic injuries may tend to be more severe in victims who do not survive to hospitalization.

CONCLUSIONS

Our data indicate that current estimates about the mortality of pelvic fractures may be faulty due to exclusion of victims who fail to survive to hospitalization. This series suggests that an appreciation of the full spectrum of pelvic ring disruptions requires collaboration between orthopaedic surgeons and forensic pathologists.

Analysis of the incidence of pelvic trauma in fatal automobile accidents

Pelvic fractures are frequent complications of motor vehicle accidents, and motor vehicle accidents are the most common cause of pelvic fracture. Although pelvic fractures are associated with considerable morbidity and mortality, there has traditionally been no attempt to grade or classify pelvic fractures during postmortem examination. The authors performed a retrospective study of cases examined at the Jefferson County Coroner/Medical Examiner Office from 1994 to 1996, reviewing investigative reports and autopsy findings. Radiographs were examined for the presence and Tile type of pelvic fracture. Pelvic fractures were identified in 88 of 392 cases (23%). In most (89%), the pelvic fracture was readily classified according to Tile type on the basis of radiographs and the inferred mechanism of injury. This study indicates that current estimates of the mortality of pelvic fractures are low because of the exclusion of individuals who do not survive to hospitalization. Furthermore, pelvic fractures in rapidly fatal motor vehicle accidents tend to be more severe than fractures in individuals who have a significant interval of survival. The presence and classification of pelvic fractures may be readily determined by radiographs in most cases. The Tile classification scheme is easy to apply and has important implications in the comparison of study groups.

Distraction external fixation in lateral compression pelvic fractures

OBJECTIVE

To observe the results and describe the technique of closed reduction and placement of a two-pin supra-acetabular external fixator, followed by immediate weight bearing, in the treatment of displaced vertically stable lateral compression pelvic fractures.

DESIGN

Prospective, consecutive

SETTING

Regional trauma center

PATIENTS

A consecutive series of fourteen patients with displaced, vertically stable lateral compression pelvic fractures who were transported to a regional trauma center.

INTERVENTION

Surgical treatment with closed reduction and maintenance of the distraction force with a two-pin, single-bar, supra-acetabular external fixator, followed by immediate weight bearing.

MAIN OUTCOME MEASUREMENTS

Healing rate and time, operative blood loss and time, quality of reduction, time to full weight-bearing, and incidence of complications, including neurovascular deficits, loss of reduction, nonunion, pin tract infections, and chronic pain.

RESULTS

A symmetric reduction of both hemipelves was achieved in all fourteen patients. Time to healing averaged 8.2 weeks (seven to twelve weeks), and no fixator required removal before healing. There were no delayed unions or nonunions, and none of the fractures displaced significantly after initial reduction. Average surgical time was thirty-seven minutes (range, twenty-five to sixty minutes) with an estimated blood loss of less than fifty milliliters. Patients were allowed to bear full weight immediately and were able to do so without ambulatory assistive devices within an average of twelve days (range, three to eighteen days). Complications consisted of three minor pin tract infections, one temporary lateral femoral cutaneous nerve palsy, one late pin tract abscess, and one patient with chronic low-back pain.

CONCLUSIONS

Treatment of type B lateral compression injuries of the pelvic ring with anterior distraction external fixation is a highly effective yet relatively simple and minimally invasive treatment method. Surgical time and blood loss are minimal, and patients can be effectively and rapidly mobilized. Based on our experience, we believe this method to be a valuable tool in the treatment of these fractures.