Closed reduction of cervical spinal deformity resulting from facet dislocation by manipulation was first described by Walton2 in 1893. Crutchfield3 introduced tongs for inline traction-reduction in 1933, and similar techniques have been successfully used for traction-reduction of cervical deformity by a large number of authors.5-22 Observations by Evans and Kleyn popularized reduction under anesthesia, although other authors condemned the procedure as potentially dangerous compared to craniocervical traction-reduction. Manipulation under anesthesia (MUA) has been a common technique, usually used following failure of traction-reduction but occasionally used as a primary means of achieving reduction.6,15,21,22 Only 1 cohort study has been performed comparing the 2 modalities. Lee et al23 found a higher rate of success and a lower complication rate with traction-reduction as opposed to MUA. The significance of their results is questionable because of the historical cohort design of the study. Lee et al attributed the higher complication rate in the MUA group to the effects of anesthesia on perfusion of the injured spinal cord. It is possible, however, that advances in the pharmacological and medical management of spinal cord-injured patients over the 10-year period of data accrual accounted for the improved results the authors noted in the traction-reduction group. For this reason, the evidence provided by this study is considered to be Class III medical evidence.
THE EFFICACY OF CLOSED REDUCTION
In 2002, the guidelines author group of the Joint Section on Disorders of the Spine and Peripheral Nerves of the American Association of Neurological Surgeons/Congress of Neurological Surgeons published a medical evidence-based guideline on this issue.1 That review reported the efficacy of closed reduction of acute cervical spinal fracture dislocation injuries derived from combined case series published in the literature to that point; > 1200 patients were treated with closed reduction, 80% (approximately) successfully. The reported neurological complication rate, permanent and transient combined, was low.
Four additional retrospective series and 3 case reports dealing specifically with closed reduction were identified in the current review that were not part of the original guideline publication, adding another 195 reported cases of closed reduction of cervical spinal fracture dislocation injuries for consideration. In 1991, Beyer et al24 described their experience with a series of 34 patients who had acute traumatic unilateral facet dislocations or fracture dislocations of the cervical spine, 28 of whom were treated with attempted closed reduction. Ten of 28 injuries were successfully reduced with halo traction and achieved anatomic realignment. Eleven had improvement in alignment but incomplete anatomic reduction. Three patients had residual neurological deficits following traction reduction, although they did not deteriorate with traction. Seven patients had dislocation injuries that could not be reduced with traction. The authors described increased difficulty with the reduction of unilateral facet dislocation injuries.
O’Connor et al25 in 2003 reported 21 patients with subaxial cervical facet injuries treated with attempted closed reduction. Eleven patients were reduced successfully. Closed reduction was not successful in any patients with a fracture dislocation injury ≥ 5 days old (n = 5). One patient had a transient neurological deterioration. Traction up to 36 kg was employed. Koivikko and colleagues26 successfully reduced cervical fracture dislocation injuries in 62 of 85 patients (73%) they treated with craniocervical traction. Their 2004 report cited 1 patient who experienced neurological deterioration following successful reduction. The temporal association of the deterioration with the closed reduction was not clear from the text of the report. Personal communication with the primary author revealed that the patient deteriorated while in traction for definitive treatment, not in association with closed reduction of the fracture dislocation injury.
In the same year, Anderson et al27 reported their retrospective series of 45 patients who underwent reduction of unilateral and bilateral traumatic cervical spinal facet dislocation injuries. Eighty-nine percent of their patients underwent successful closed reduction. The authors found that motor score on presentation and patient age were statistically related to final motor score. Those with preserved neurological function at presentation and younger patients tended to do better. Time to reduction did not correlate with improved motor score outcome in their study. However, their analysis suffers from the fact that nearly two-thirds of the original cohort were excluded from analysis because of incomplete medical records.
Reindl et al28 in 2006 described their experience with anterior fusion/internal fixation for cervical spinal facet dislocation injuries. Thirty-three of the 41 patients they treated achieved successful closed reduction (80%). One patient had transient neurological deterioration due to closed reduction that resolved at 1 year following surgery. All 41 patients were treated anteriorly, including 8 with dislocation injuries that could not be reduced with traction. Only 2 patients treated anteriorly could not be reduced/stabilized with interbody fusion and internal fixation. Those 2 patients subsequently required posterior reduction, stabilization, and fusion.
Class III medical evidence supports the efficacy of closed reduction of acute traumatic cervical spinal fracture dislocation injuries. A number of investigators have suggested that early reduction of the traumatic cervical spinal deformity/restoration of the spinal canal improves neurological outcome.1,10,15,27,29-33 To date, that intuitive supposition has yet to be supported by Class I or Class II medical evidence.
THE RISK OF CLOSED REDUCTION OF CERVICAL SPINAL INJURIES
The incidence of neurological deterioration related to closed reduction remains low. Before 2001, the reported permanent neurological complication rate was < 1.0%.5,7,11,13-21,31,34-39 Of the 11 patients reported to develop new permanent neurological deficits with attempted closed reduction, 2 had root injuries, and 2 had ascending spinal cord deficits noted at the time of reduction.11,13,14,20 Seven patients were noted to have decreased American Spinal Injury Association motor scores after reduction; however, neither the nature nor the cause of the new deficits in these patients was described.15 The current literature review failed to uncover any other reports of patients who suffered a permanent neurological deficit related to closed reduction.
Transient neurological deterioration following closed reduction has also been reported with an incidence between 2% and 4%. Before 2001, temporary deficits were described in 20 patients of 1200 reported. These deficits reversed spontaneously or improved following reduction of weight or following open reduction.11,13-15,21,31 The causes of neurological deterioration associated with closed reduction in these and other series included overdistraction, failure to recognize a more rostral noncontiguous lesion, disk herniation, epidural hematoma, and spinal cord edema.11,13,16,20,31,40-42
Mahale et al43 reviewed 16 cases of neurological deterioration in patients with cervical spinal cord injuries following reduction of cervical facet dislocation injuries. Seven of the 16 patients developed complete cord injuries, 6 following open reduction and 1 following manipulation under anesthesia. Five patients developed partial injuries, 3 following MUA, 2 following closed traction-reduction, and 1 following open reduction. Of the 2 patients who deteriorated following closed reduction, 1 patient was found to be overdistracted. Minor injuries were suffered by the remaining 3 patients, including 1 patient who deteriorated when the skull traction pins slipped, 1 patient who deteriorated in a plaster brace, and 1 patient who lost reduction and had neurological worsening. Nine of the 16 patients whom Mahale et al described were investigated with myelography following deterioration, 2 patients with MRI, and 1 patient with CT. A disk protrusion was noted in 1 patient, and a “disk prolapse with hematoma” was noted in another. Both of these patients were treated conservatively. The most common imaging finding in these 9 patients was cord edema.
Four additional retrospective series and 3 case reports dealing specifically with closed reduction for cervical spinal injuries were identified in the current review, adding another 195 reported cases of closed reduction reported since 2001. Four patients in this cohort were reported to suffer transient neurological deterioration in conjunction with closed reduction.25,28,44 The cause of the deterioration was not specified in three of the patients and was attributed to ossification of the posterior longitudinal ligament in the fourth. Three of the 4 patients experienced neurological recovery following surgical treatment.
Reports of neurological deterioration following closed or open posterior reduction of cervical fracture/dislocation injuries has led some authors to recommend the use of prereduction MRI to assess for ventral cord compromise caused by traumatic disk disruption. The risk of extruded disk material exacerbating neurological compression is the main concern related to closed reduction. However, prereduction MRI assessment requires the transport of a patient with a potentially unstable cervical spinal fracture/dislocation injury to the MRI suite. The use of prereduction MRI may delay reduction of the spinal deformity and therefore may delay decompression of the compromised spinal cord. If stabilization of the unstable cervical spine protects against additional injury to the cervical spinal cord, the information gained by prereduction MRI must be of sufficient value to warrant the delay in treatment and the associated potential morbidity of transport.
Several authors have reported the prevalence of MRI-documented disk herniation in association with cervical facet injury. Harrington et al15 reported a series of 37 patients managed with closed reduction. Postreduction imaging revealed a disk herniation in 9 patients, four of whom underwent later anterior decompression. Doran et al45 reported a series of 13 patients drawn from 4 institutions over an unspecified time period. All patients underwent MRI evaluation, four of which were performed before reduction. Herniated disks were visualized in 10 patients; bulging disks were identified in 3 patients. No patient treated developed a permanent neurological deficit as a result of attempted closed reduction. Vaccaro et al8 studied 11 consecutive patients with prereduction and postreduction MRI. The authors found a herniated disk in 2 patients in the prereduction group and in 5 of 9 patients who underwent successful closed reduction. Grant et al46 obtained postreduction MRI studies on 80 patients treated with closed reduction and found herniated or bulging disks in 46%. Rizzolo et al39 found evidence of disk disruption/herniation in 55% of patients studied with prereduction MRI. Awake and alert patients underwent closed reduction with no neurological deterioration. The authors did not attempt closed reduction in patients who were not awake. The clinical implications of the findings of a disk herniation on a prereduction MRI were questioned by the authors.
In 2006, Daursaut et al47 studied the risk of closed reduction using a unique traction device to monitor reduction with MRI. Seventeen nonconsecutive patients were studied; 11 of 17 were successfully reduced with closed craniocervical traction, and 9 of those 1 patients achieved complete spinal cord decompression. One patient had incomplete decompression, and 1 patient had none. Interestingly, all soft disk herniations identified before the initiation of closed reduction were reduced back into the disk space as part of the traction-reduction process.
Despite the paucity of evidence regarding the value of prereduction MRI in the patient who has a cervical spinal dislocation, the topic remains controversial. Lee et al23 in 2009 published a review on the topic and found no medical evidence-based guidelines for the treatment of the obtunded patient with a cervical dislocation. Arnold et al35 performed a survey of 29 spinal surgeons from The Spine Trauma Study Group asking for their management responses to ten clinical scenarios related to acute unilateral and bilateral cervical facet dislocation injuries. There was substantial variability among surgeons regarding the need for prereduction MRI, depending on the clinical scenario (42%-77%), and little agreement regarding open or closed reduction to reduce the injury or the operative approach to provide definitive surgical treatment. In 2004, Koivikko et al26 reported their experiences with a series of 85 patients treated for cervical fracture/dislocation injuries. Sixty-two experienced successful reduction with closed cervical traction; the others required operative reduction. No patients underwent prereduction MRI, and no patient deteriorated neurologically as a result of closed reduction. All surgical patients were treated with posterior interspinous wiring with fusion. Despite these results, the authors admit to more recent use of prereduction MRI in the management of patients with cervical fracture/dislocations since their publication.
Neurological deterioration from extruded disk material has been reported to occur in conjunction with both anterior and posterior open reduction following failed closed reduction. Eismont et al34 reported a series of 63 patients managed with closed traction-reduction followed by open reduction if closed reduction was unsuccessful. One of these patients worsened following posterior open reduction and fusion. A herniated disk was found ventral to the cord on postprocedure myelography. Herniated disks were found in 3 other patients who failed closed reduction and in 2 patients with static neurological deficits following fracture/dislocation reduction (1 open, 1 closed). One of these patients deteriorated after subsequent anterior cervical diskectomy and fusion. Olerud and Jónsson32 described 2 patients found to have disk herniations on postreduction MRI or computed tomographic myelography. Both patients deteriorated after open reduction following failure of attempted closed reduction. Robertson and Ryan19 reported 3 patients who deteriorated during management of cervical subluxation injuries. One of their patients worsened during transport to the hospital. That patient’s vertebral injury was found to have spontaneously partially reduced. MRI revealed a disk fragment compressing the cord. A second patient deteriorated following posterior open reduction. MRI revealed disk fragments compressing the ventral cord. Mahale et al43 reviewed 16 cases of neurological deterioration in patients with cervical spinal cord injuries following reduction of facet dislocations. Seven of the 16 patients developed complete cord injuries, 6 following open reduction and 1 following manipulation under anesthesia. Preoperative MRI to assess for the presence of a significant disk herniation with the potential to cause spinal cord compression and neurological deficit when closed reduction has failed is recommended on the basis of these reports.
Review of the available literature reveals only 2 documented cases of neurological deterioration associated with attempted closed reduction of cervical spine fracture/dislocation injuries resulting from cord compression from disk herniation.13,48 Both of these cases were characterized by deterioration hours to days following closed reduction. A number of large clinical series have failed to establish a relationship between the presence of a prereduction herniated disk and subsequent neurological deterioration with attempted closed traction-reduction in awake patients.
In the data derived from the literature published to date, closed reduction of fracture/dislocation injuries of the cervical spine by traction-reduction appears to be safe and effective for the reduction of acute traumatic spinal deformity in awake patients. Approximately 80% of patients will have their cervical fracture dislocation injuries reduced with this technique. The overall permanent neurological complication rate of closed reduction is approximately 1%. The associated risk of a transient injury with closed reduction appears to be 2% to 4%. Closed traction-reduction appears to be safer than MUA.
There are numerous causes of neurological deterioration in patients whom harbor unstable cervical spinal injuries. These include inadequate immobilization, unrecognized rostral injuries, overdistraction, loss of reduction, and cardiac, respiratory, and hemodynamic instability. Therefore, an appropriately trained specialist must supervise the treatment, including attempted closed reduction, of patients with cervical spine fracture dislocation injuries.
Although prereduction MRI will demonstrate disk herniation in up to half of patients with acute cervical spinal facet subluxation injuries, the clinical importance of these findings is unknown. Only 2 case reports were found that document neurological deterioration caused by disk herniation following successful closed traction-reduction. In addition, several investigators have demonstrated the lack of correlation between the MRI findings of disk herniation and neurological deterioration in this patient population. The use of prereduction MRI has therefore not been shown to improve the safety or efficacy of closed traction-reduction of patients with acute cervical fracture dislocation injuries. MRI before fracture/dislocation reduction may unnecessarily delay spinal column realignment for decompression of the spinal cord. There is Class III medical evidence that supports early closed reduction of cervical fracture/dislocation injuries with respect to neurological recovery. Prereduction MRI in this setting is not necessary. The ideal timing of closed reduction of cervical spinal fracture dislocation injuries is unknown, but many investigators favor reduction as rapidly as possible after injury to maximize the potential for neurological recovery.10,15,29-32
Patients who fail attempted closed reduction of cervical fracture injuries have a higher incidence of anatomic obstacles to reduction, including facet fractures and disk herniations. Patients who fail closed reduction should undergo more detailed radiographic study/MRI before attempts at open reduction. The presence of a significant disk herniation in this setting is a relative indication for an anterior decompression procedure, either in lieu of or preceding a posterior procedure.
Patients with cervical fracture dislocation injuries who cannot be examined because of head injury or intoxication cannot be assessed for neurological deterioration during attempted closed reduction. For this reason, an MRI before attempted reduction (open or closed) is recommended as a treatment option on the basis of Class III medical evidence.
KEY ISSUES FOR FUTURE INVESTIGATION
A prospective cohort study of patients with cervical spinal cord injuries resulting from facet fracture-subluxation injuries treated with or without prereduction MRI would provide Class II medical evidence in support of a treatment recommendation on this issue. This type of comparative study could also address issues of timing of closed reduction.
No prospective comparative study of closed reduction vs anterior decompression and stabilization for patients with MRI-documented herniated disks in association with unreduced cervical fracture/dislocation injuries has been performed. A prospective comparative study would provide Class II medical evidence in support of a treatment recommendation on this issue.
The authors have no personal financial or institutional interest in any of the drugs, materials, or devices described in this article.
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Keywords:Copyright © by the Congress of Neurological Surgeons
Cervical facet dislocation injuries; Closed reduction; Craniocervical traction