Unilateral lumbosacral dislocation: case report and a comprehensive review

Traumatic L5/S1 bilateral locked facets with bilateral pars fractures - A case report

Background

Although rare, traumatic lumbosacral (L/S) Grade I spondylolisthesis (i.e., Lumbar locked facet syndrome) is characterized by unilateral or bilateral facet dislocations.

Case Description

A 25-year-old male presented following a high velocity road traffic accident with back pain and tenderness at the L/S junction. His radiologic images showed bilateral locked facets at the L5/S1 level with Grade 1 spondylolisthesis, bilateral pars fractures, acute traumatic L5/S1 disc herniation, and disruption of the anterior and posterior longitudinal ligaments. After undergoing a L4-S1 laminectomy with pedicle screw fixation, he became asymptomatic and remained neurologically stable.

Conclusion

L5/S1 facet dislocation whether unilateral or bilateral needs to be diagnosed early and treated with realignment and instrumented stabilization.

Anterior Traumatic Lumbosacral Dislocation: A Case Report

Traumatic dislocation of the lumbosacral joint is a rare and severe lesion usually caused by high-energy trauma. The literature on traumatic spondylolisthesis is limited, and most published papers are sporadic case reports. By presenting the case of an anterior traumatic L5-S1 spondylolisthesis without neurological deficits caused by a 6-meter fall, we discuss the anatomopathological mechanism of this injury, clinical and radiological evaluation, and current management options. The patient was treated surgically with a combined posterior instrumented reduction and transforaminal interbody fusion. At the final follow-up after seven years, the radiological evaluation showed an unchanged spondylolisthesis reduction with reliable fusion healing. In addition, the patient had good functional results and resumed recreational activities and work. Traumatic lumbosacral spondylolisthesis requires a careful and well-documented initial clinical and radiological assessment. Most authors advocate surgical treatment as the mainstay of management. However, the long-term prognosis remains unclear and unpredictable.

Treatment of unilateral L5-S1 locked facet in a pediatric patient

Background

Traumatic unilateral lumbosacral facet dislocations are rare injuries. The majority of cases are treated with open reduction and instrumented spinal fusions. Only less commonly can they be managed conservatively.

Case Description

A 7-year-old unrestrained passenger was involved in a high-speed motor vehicle accident. X-ray/magnetic resonance/computed tomography imaging documented a unilateral L5-S1 facet dislocation and multiple lumbar/sacral fractures. The patient underwent open reduction and temporary L5-pelvic instrumentation without fusion; the instrumentation was removed 10 weeks later at which point follow-up imaging showed preserved lumbosacral stability.

Conclusion

Open reduction with temporary instrumentation without fusion was successfully utilized to treat a unilateral L5-S1 facet dislocation in a 7-year-old child.

Traumatic Bilateral L3-4 Facet Dislocation With Open Decompression and Short Segment Fusion

Traumatic lumbar facet dislocations are exceedingly rare, with reported cases primarily involving the lumbosacral junction. This injury arises from very high flexion distraction forces imparted on the lumbar spine. Herein we describe a bilateral L3-4 facet dislocation, a particularly rare injury pattern, using a short-segment posterior decompression and fusion followed by an interbody fusion through a lateral approach. Our case involves a 24-year-old man who presented to the emergency department after a high-speed, head-on motor vehicle collision. He was a restrained passenger with no prior significant medical history. He was found to have multisystem injuries, the most notable a L3-4 bilateral lumbar facet dislocation. The patient was neurologically intact upon his presentation but developed radiculopathy several hours into his hospital admission. He was treated operatively through a posterior decompression and instrumented short-segment fusion as well as a subsequent interbody fusion through a lateral approach at the same level. Pure lumbar spine facet dislocations outside the lumbosacral junction, especially bilateral dislocations, are exceedingly rare and often result in neurological deficits. A literature review reveals only a few cases outside of Asia, all of which were treated with decompression and either short- or long-segment fusion. No accepted treatment algorithm for this injury has been established. Open treatment is almost always indicated. Decompression and short-segment fusion is a valid treatment option, but patient and injury characteristics must be considered on an individualized basis.Level of Evidence: 5.

Traumatic Lumbosacral Dislocation: Current Concepts in Diagnosis and Management

Traumatic lumbosacral dislocation is a rare, high-energy mechanism injury characterized by displacement of the fifth lumbar vertebra in relation to the sacrum. Due to the violent trauma typically associated with this lesion, there are often severe, coexisting injuries. High-quality radiographic studies, in addition to appropriate utilization of CT scan and MRI, are essential for proper evaluation and diagnosis. Although reports in the literature include nonoperative and operative management, most authors advocate for surgical treatment with open reduction and decompression with instrumentation and fusion. Despite advances in early diagnosis and management, this injury type is associated with significant morbidity and mortality, and long-term patient outcomes remain unclear.