Sagittally oriented fractures of the lateral masses of the cervical vertebrae

Classification of unilateral cervical locked facet with or without lateral mass-facet fractures and a retrospective observational study of 55 cases

This study describes a morphology-based unilateral cervical facet interlocking classification in an attempt to clarify the injury mechanism, instability, neurological deficits, radiological features, and determine optimum management strategies for these injuries. A total of 55 patients with unilateral cervical locked facet (UCLF) involving C3 to C7 were identified between January 1, 2012 and December 1, 2019. The injuries were classified into three types, and they were further divided into six subtypes using three-dimensional computed tomography. The injury mechanism, clinical features, neurological deficits, and imaging characteristics were analyzed, and the appropriate treatment strategies for UCLF were discussed. UCLFs were divided into the following six subtypes: UCLF without lateral mass-facet fracture (type I) in nine cases, with superior articular process fracture (type II A) in 22, with inferior articular process fracture (type II B) in seven, both superior and inferior articular process fractures (type II C) in four, with lateral mass splitting fracture (type III A) in three, and with lateral mass comminution fractures (type III B) in ten. A total of 22 (40.0%) of the 55 patients presented with radiculopathy, and 23 patients (41.8%) had spinal cord injuries. The subtype analyses showed high rates of radiculopathy in types II A (68.2%) and II C (75.0%), as well as significant spinal cord injury in types I (77.8%) and III (61.5%). Destruction of the facet capsule was observed in all patients, but the injury of disc, ligamentous complex, and vertebra had a significant difference among the types or subtypes. The instability parameters of the axial rotation angle, segmental kyphosis, and sagittal displacement showed significant differences in various types of UCLF. Closed reduction by preoperative and intraoperative general anesthesia traction was achieved in 27 patients (49.1%), and successful rate of closed reduction in type I (22.2%) was significantly lower than that in type II (51.5%) and type III (61.5%). A total of 35 of 55 patients underwent a single anterior fixation and fusion, 10 patients were treated with posterior pedicle and (or) lateral mass fixation, and combined surgery was performed in ten patients. Ten patients (18.2%) with a poor outcome were observed after first surgery. Among them, 3 patients treated with a single anterior surgery had persistent or aggravated radiculopathy and posterior approach surgery with ipsilateral facet resection, foramen enlargement, and pedicle and (or) lateral mass screw fixation was performed immediately, 5 patients treated with a short-segment posterior surgery showed mild late kyphosis deformity, and 2 patients with vertebral malalignment were encountered after anterior single-level fusion during the follow-up. This retrospective study indicated that UCLF is a rotationally unstable cervical spine injury. The classification proposed in this study will contribute to understanding the injury mechanism, radiological characteristics, and neurological deficits in various types of UCLF, which will help the surgeons to evaluate the preoperative closed reduction and guide the selection of surgical approach and fusion segment.

Unilateral lateral mass-facet fractures with rotational instability: new classification and a review of 39 cases treated conservatively and with single segment anterior fusion

OBJECTIVE

This study examined the clinical and radiologic results of cervical spine injuries associated with a unilateral lateral mass-facet fracture (ULMFF) in an attempt to clarify the fracture pattern and treatment strategies using single-level anterior fusion.

METHODS

From July 2003 to June 2006, adult patients, who had sustained ULMFFs of the middle cervical spine, were reviewed retrospectively. The fractures were classified into six subtypes using roentgenogram and computed tomography imaging with three-dimensional analysis. Initially, 15 patients without severe translation and kyphosis were treated with external immobilization and 24 patients were treated surgically with anterior fusion. The fusion state and spinal alignment were evaluated at the follow-up visits.

RESULTS

Thirty-nine patients had 27 lateral mass fractures and 14 facet joint fractures. The lateral mass fractures were divided into the following four subtypes: unilateral spondylolithesis in 16, separation fracture in 5, comminution type in 4, and split type in 2. Facet fractures with/without facet dislocation were observed in seven patients. Twelve patients who received conservative management required delayed fusion due to persistent pain and late instability. Overall, 36 patients, with the exception of three cases with a successful result by external immobilization, underwent surgery using single-level anterior fixation with anterior plating. A poor radiologic outcome was observed in eight patients after the procedure. Five cases showed incomplete reduction or a failure of the reduction. Three cases had adjacent instability and malalignment despite the early fusion observed due to short-segment fusion in the separation type.

CONCLUSION

This retrospective review of ULMFF showed that nonsurgical treatment is usually unsuccessful, and early single-level anterior arthrodesis has a favorable outcome. However, exclusive two-level stabilization or pedicle screw fixation needs to be considered in the separation type.

Clearing the cervical spine in unconscious polytrauma victims, balancing risks and effective screening

Cervical spine injury occurs in 5-10% of cases of blunt polytrauma. A missed or delayed diagnosis of cervical spine injury may be associated with permanent neurological sequelae. However, there is no consensus about the ideal evaluation and management of the potentially injured cervical spine and, despite the publication of numerous clinical guidelines, this issue remains controversial. In addition, many studies are limited in their application to the obtunded or unconscious trauma victim. This review will provide the clinician managing unconscious trauma victims with an assessment of the actual performance of clinical examination and imaging modalities in detecting cervical spine and isolated ligamentous injury, a review of existing guidelines in light of the available evidence, relative risk estimates and a proposed management scheme.

The anatomy and pathophysiology of neck pain

This article carefully itemizes the various anatomic structures that can evoke neck pain, putting in perspective what clinicians know, what they assume, and what they need to understand better about neck pain and pain referred from the neck. The critique of many of the accepted entities in the differential diagnosis of neck pain is crucial to an understanding of the causes of neck pain and an ability to implement appropriate therapies.

Vertebral artery injury associated with a Jefferson fracture

BACKGROUND

The evaluation and treatment of Jefferson fractures, a burst fracture of the ring of Cl, has been well documented in the medical literature. Vertebral artery injury associated with a Jefferson fracture is very rare.

METHODS

The case study technique was used to summarize the case. Review of the literature was performed to discuss the case. Retrospective chart review of the 174 patients with cervical fractures admitted to St. Michael's Hospital from 1989-1994 was also performed.

RESULTS

The case of a patient with a Jefferson fracture, with bilateral lateral displacement of the lateral masses causing bilateral vertebral artery occlusions resulting in a lateral medullary and cerebellar infarction is reported. A review of the literature is provided.

CONCLUSION

A high index of suspicion for this injury is paramount, especially in patients with multiple trauma, where the diagnosis of Jefferson fractures can be delayed.