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Journal of Orthopaedics and Traumatology

Official Journal of the Italian Society of Orthopaedics and Traumatology

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Thoracolumbar burst fracture with complete paraplegia: rationale for second-stage anterior decompression and fusion regarding functional outcome

Journal of Orthopaedics and Traumatology volume 10, pages 83–90 (2009)Cite this article

Abstract

Background

Appropriate management of thoracolumbar injury with complete paraplegia remains controversial. Purpose of present study is to study whether advantages are worth the morbidity associated with staged anterior decompression in these patients.

Materials and methods

Forty patients (90% male) with fracture of T12 (32 cases) and L1 (8 cases) with complete paraplegia underwent transpedicular fixation. Average age of patients was 42 years (range 13–57 years). Most common fracture pattern was type A3.1 (55%). Rational staged anterior decompression was done in 20 cases. One group received transpedicular fixation (n = 20) and another fixation and staged decompression (n = 20). Average follow-up was 2.5 years.

Results

Mean functional independence measurement (FIM) score was 98 in fixation group and 112 in decompression group; mean neurological recovery as measured by American Spinal Injury Association (ASIA) grade was 1.3 and 1.75, respectively. Incidence of postoperative complications was 20% and 60%, respectively. Sphincter control did not recover in either group.

Conclusions

Rehabilitation is better after staged anterior decompression and fusion in burst fracture of thoracolumbar junction with complete paraplegia.

Introduction

Biomechanically, thoracolumbar junction is susceptible to injury and is the most commonly injured portion of the spine [1, 2]. Other organ system injury is encountered in up to 50% of thoracolumbar trauma patients [3–7]. Once one spine injury is diagnosed, it is especially important to examine the rest of the spine since noncontiguous injuries can be present 15% of the time [8].

Initial radiographic assessment includes anteroposterior (AP) and lateral spine films. Plain radiographs are not accurate in determining involvement of the posterior wall of the vertebral body [9]. Magnetic resonance imaging (MRI) is useful in evaluating those patients with neurological injury that cannot be accounted for by osseous disruption on plain radiographs and computed tomography (CT) scan. MRI can reveal injury to the spinal cord and ligaments, annulus fibrosis, disc herniations, and epidural hematomas [10–14].

One of the earliest classifications of spinal fractures was by Watson Jones in 1931, based primarily on diagnosis and treatment of flexion injuries [15]. One of the most popular classification systems is based on the “three-column” theory proposed by Denis in 1983 as an extension of the biomechanical work of Nagel [16, 17]. Later on, load-sharing classification was proposed by McCormack [18] based on degree of comminution, apposition of fragments, and degree of deformity. The most useful classification of thoracolumbar injuries is the association for osteosynthesis/association for the study of internal fixation (AO-ASIF) classification proposed by Magerl [19] based on pathomorphological characteristics of injuries. Three main categories with a common injury pattern were formed: type A—vertebral body compression (compression force), type B—anterior and posterior element injury with distraction (tensile force), and type C—anterior and posterior element injury with rotation (axial torque). Further subclassification is primarily based on AO 3-3-3 grid.

Nonoperative treatment is indicated for stable injuries without the potential for progressive deformity or neurological injury. The most devastating complication of nonoperative treatment is development of neurological deterioration. Denis [20] noted that 6 of 29 nonoperatively treated burst fractures developed neurological deficit. On the other hand, Reid [21] and Cantor [22] noted no neurological worsening in their nonoperatively treated patients with burst fractures. Gertzbein demonstrated in a large study that kyphotic deformity greater than 30° correlated with increased back pain [23]. In neurologically intact patients, nonoperative treatment is generally recommended [24]. The American Spinal Injury Association (ASIA) scoring system can assist in documenting, monitoring, and treating neurological injuries [25]. The use of methylprednisolone in the immediate postinjury phase has been shown to improve outcomes in the National Acute Spinal Cord Injury Study (NASCIS) [26], but this improvement has not been substantiated in their studies and its role remains controversial. Surgery is typically employed in patients with unstable injuries and significant neurological deficits. Laminectomy alone is not recommended for decompression of spinal column injuries in that it can further destabilize the spine [27].

Early reports of decompression and stabilization in patients with neurological deficit and thoracolumbar fracture demonstrated improvement that was equal to that of nonoperative results in the literature [28–34]. With the advent of newer instrumentation techniques and aggressive direct anterior decompression, the degree of neurological recovery appears more favorable than earlier reports [35–41]. Vertebroplasty and kyphoplasty are two techniques that show good potential in terms of decreasing pain and improving function in osteoporotic low-energy compression and burst fractures. Early reports demonstrate these techniques to be highly effective with good pain relief and relatively few complications [42–46]. Primary goals in thoracolumbar trauma patients are preservation of remaining spinal cord function, restoration of spinal alignment, achievement of pain-free fracture site, maximum neurological recovery, and early rehabilitation. This can be achieved by optimizing neural decompression while providing stable internal fixation over the least number of spinal segments [47]. The pedicle screw rod systems, by virtue of direct fixation through middle and anterior columns, are able to reduce fractures of these columns by ligamentotaxis [48–52]. Transpedicular screw rod construct is currently the standard in segmental fixation of thoracolumbar spine [53–55]. Posterior surgery with pedicle screw constructs over a short segment stabilizes the fracture and allows early mobilization, much as nonoperative regimes do. Recent prospective randomized studies comparing these two treatment options suggest there is no clinical advantage of surgery over nonoperative care [56, 57].

Surgery corrects deformity but modest recurrence is common, even with attempts to perform transpedicular bone grafting, as the anterior column remains deficient [58].

Anterior decompression will be more effective for anterior neural compression such as occurs in a burst fracture. Anterior decompression has been shown to increase axoplasmic flow, decrease ischemia, and lead to improvement of neurological function. The disadvantage of posterior approaches to achieve anterior decompression include the need to resect major portions of the neural arch (often uninjured) to obtain access to the middle column. Finally, it is difficult to reconstruct the anterior and middle columns after a posterior approach has been used to decompress a burst fracture, and there is significant incidence of construct failure [59].

The aim of this study is to weigh up the morbidity associated with anterior decompression with the ultimate functional outcome.

Materials and methods

Study followed ethical standards and was approved by institutional review board. Informed consent was obtained from all patients. Forty patients of posttraumatic instability of thoracolumbar transition with clinical signs of complete paraplegia were surgically managed at paraplegia hospital, New Civil Hospital, Ahmedabad, India during December 2004 to September 2006. Only those patients who had neurological status of grade A on ASIA impairment scale were included in the series. Thirty-six patients were male and four were female. Thirty-two patients had T12 fracture and eight patients had L1 fracture. Average age of patients was 42 years, and most of the patients were in their fourth decade. Age of patients ranged from 13 to 57 years. All patients had good bone quality. Associated injuries were found in 18 cases, of which 12 were fracture of calcaneum, which is explicable because the most common mode of injury in our patients was fall from height, being the reason for trauma in 32 cases. Eight patients were injured in road-traffic accidents. Detailed history and examination carried out. After emergency treatment, plain radiograph in anteroposterior and lateral view were obtained. Mean angle of kyphosis was 34°. MRI was done to further evaluate important relationships and integrity of osseous and nonosseous tissue, instability of spine, and status of neural tissue. AO classification of thoracolumbar injuries was used to classify the fractures (Table 1). Twenty-two cases had incomplete burst fracture (type A3.1). Ten cases had burst-split fracture (A3.2). Next most common was complete flexion burst fracture (type A3.3.2), found in six cases. Two patients had complete axial burst fracture (type A3.3.3). Pros and cons of surgical treatment were explained to all patients. After understanding the nature of trauma and prognosis all patients underwent posterior transpedicular fixation. All patients were operated within 2 weeks. The average trauma-stabilization interval was 4 days, ranging from 1 to 12 days.

Table 1 Fracture types and management
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Technique of transpedicular fixation

The patient was placed prone on a four-poster frame to facilitate intraoperative imaging, maintain adequate sagittal alignment, and minimize any pressure to the anterior thorax or abdomen. After proper painting and draping, bony anatomy was exposed with standard posterior midline approach. Soft tissue was elevated from one level above to one level below the fracture using Cobb elevator so that anatomical landmarks could be clearly defined. Starting point was located at the junction of a vertical line along the lateral pars boundary and a transverse line dividing the transverse process in half. From starting points 2.5-mm K wires were inserted in all four pedicles under guidance of image intensifier. The image beam trajectory in the sagittal plane should be parallel to the superior vertebra end plate. In the transverse plane the image trajectory should be collinear to the pedicle insertion angle with the vertebral body. The spinous processes should be centered between the vertebral body boundaries to reduce any parallax effect. After confirming starting point in AP view and assessing screw path trajectory and depth in lateral view, pedicle tracts were formed with pedicle awl and all four tracts were palpated with depth gauge to measure size of screw as well as to verify presence of a bony floor and an intact four-wall boundary. Next the path was undertapped by 1.0 mm compared with the diameter of the selected screw. The pedicle screw was then inserted. Following screw insertion, intraoperative imaging was performed to verify acceptable screw positioning. Contoured rods were docked on either side and tightened after distraction kyphosis correction maneuver. Drain was placed and closure done in layers.

Postoperative treatment and rehabilitation

Broad-spectrum intravenous antibiotic was given for 5 days. Drain was removed on second postoperative day and tilt-table mobilization was started with 25° increment every day. Next, wheelchair activities were started. Stitches were removed on 12th postoperative day. With the support of posterior knee guards and toe-raising splints, patients were made to walk with walker as soon as they got power in hip. Orthosis was maintained for 4 months.

Second-stage anterior decompression and fusion was done in cases where:

  1. 1.

    Distraction kyphosis correction maneuver failed and there was more than 5° kyphosis after posterior fixation (12 cases)

  2. 2.

    Any retropulsed fragment was seen on postoperative X-ray (8 cases)

All patients in this group were operated within 3 weeks. Average trauma-decompression interval was 16 days, ranging from 6 to 21 days.

Technique

In anterior decompression, left 11th or 12th rib sided extra pleural-retroperitoneal approach in lateral position was used to expose the fractured vertebrae [60, 61]. We did less invasive spinal surgery with the help of AO-ASIF synframe system and light source. During surgery AO-ASIF synframe provides stable operative field and direct visualization of the field with an incision of 6–8 cm. Posterior two-thirds of vertebral body was excised and spinal canal was fully decompressed (Fig. 1). Reconstruction was carried out with mesh cage filled with bone graft obtained from resected vertebrae augmented with rib graft. Cage was placed anteriorly and centrally and clearly away from the canal (Fig. 2).

Fig. 1
figure 1

Less invasive corpectomy and spinal canal decompression

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Fig. 2
figure 2

Vertebral column reconstruction with mesh cage

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Drain was placed and closure done in layers. Patients were nursed supine and log-rolled for comfort. Chest drains were removed when X-rays showed that the lung was expanded and drainage reduced. Postoperative treatment and rehabilitation protocol was the same as for stabilization group but rehabilitation was somewhat delayed because of pain and postoperative complications.

Results

Postoperative X-ray in all patients included in the study showed good hardware position (Fig. 3). Mean kyphosis correction was 22° in all 40 cases. In 12 cases kyphosis was found to be more than 5° after transpedicular fixation. Kyphosis >5° was considered as failure of kyphosis correction maneuver and staged anterior decompression was done. These cases were excluded from the first group and included in second-stage decompression group. Eight cases received anterior decompression because of retropulsed fragment that could not be reduced after transpedicular fixation. Mean lordosis in fixation group (n = 20) was 3° postoperative and mean loss of correction was 6° at 2-year follow-up in this group. Fusion was achieved in all cases of decompression group and no loss of correction was observed in this group. Postoperative complications were significantly higher in staged decompression group and rehabilitation was delayed because of pain and postoperative complications (Table 2).

Fig. 3
figure 3

Distraction kyphosis correction with pedicle screw system in burst fracture D12

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Table 2 Postoperative complications
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Neurological improvement was better in staged decompression group, where the patients recovered by mean grade of 1.75 on American Spine Injury Association (ASIA) impairment scale. In fixation group patients recovered by mean ASIA grade of 1.3 (Table 3). No patient recovered completely.

Table 3 Neurological recovery at 2-year follow-up
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Statistically, neurological recovery was better in decompression group. Analysis was done by making two groups according to recovery on ASIA impairment scale (Table 4). Application of chi-square test (Table 5) yielded P = 0.025 and analysis of variance (ANOVA) (Table 6) yielded P = 0.033, which is significant; interpretation is that neurological improvement by two or three grades of ASIA scale is better in the staged anterior decompression group than in the transpedicular fixation-only group.

Table 4 Lower and higher recovery groups
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Table 5 Chi-square test
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1

Table 6 ANOVA test
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Although rehabilitation was faster in fixation-only group, at 2-year follow-up score on functional independence measurement scale (FIM) was considerably higher in staged decompression group (mean score 112) than in fixation-only group (mean score 98). Application of independent sample t-test resulted in P < 0.0001, which shows that there was significantly higher functional recovery in the staged decompression group than in the fixation group (Tables 7, 8, 9).

Table 7 FIM score
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Table 8 FIM score group statistics
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Table 9 Independent samples test
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Out of 22 cases of type A3.1 fractures only four fractures required second-stage anterior decompression. These fractures were those where trauma-fixation interval was more than 7 days and distraction kyphosis correction maneuvers failed. Two patients in fixation group did not show any recovery. These two cases were of type 3.2. In decompression group two patients who recovered up to ASIA grade D were both of type 3.1 fractures and two who did not show any recovery were of type 3.3.3. No other significant correlation were observed between the fracture pattern and recovery.

Summary of patients characteristics and comparison are tabulated in Table 10.

Table 10 Comparison of characteristic in transpedicular fixation-only group (n = 20) and staged anterior decompression group (n = 20)
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Discussion

Our study showed that outcome in patients of thoracolumbar junction burst fractures with complete paraplegia depends on multiple factors such as fracture pattern, trauma-fixation interval, and type of surgery offered. The two groups in this study were not randomized, which is a weak point because more severe injuries underwent staged anterior decompression. In spite of severe injury pattern and morbidity of staged surgery the ultimate functional outcome (FIM score) was better in staged decompression group. In incomplete burst fractures transpedicular fixation and faster rehabilitation given comparable results in our series and is the only type of burst fracture which was treated satisfactorily with transpedicular fixation alone if done within 7 days. In our study only 4 cases out of 22 of type A3.1 fractures required anterior decompression and fusion because these were operated after 7 days, and distraction and kyphosis correction maneuvers failed in these cases. Only two cases of split burst fractures (type 3.2) were treated with transpedicular fixation alone and both did not show any recovery and had persistent back pain and recurrence of kyphotic deformity (loss of correction >5°). It is important to take into consideration the results of Shono et al. [62], who have shown in their experimental study that posterior distractive reduction maneuver generates anterior and middle spinal column defects, leading to significant mechanical instabilities, particularly in axial compressive loading. Short-segment posterior pedicle screw fixation technique to resist axial spinal loading anteriorly is not adequate [63], but if the construct is used in neutral mode and adequate strut support is provided anteriorly, the efficacy and utility of pedicle screws is increased.

Anterior surgery achieves more complete and reliable decompression with interbody fusion along the lines of axial loading, which is very important in the biomechanics of the spinal functioning in this region. Anterior surgery has better canal clearance than posterior pedicle screws system. Edelker et al. [64] showed that two-motion-segment stabilization along with anterior bone grafting effectively addresses the anterior and middle columns.

Second-stage anterior decompression surgery is associated with higher complication rate and morbidity, even if done less invasively with AO-ASIF synframe system. The biggest problem is bed sores.

In spite of higher morbidity and postoperative complications the final results with staged anterior decompression are better than with transpedicular fixation alone.

Spinal canal decompression seems to be achieved indirectly by pedicular screw system, and it considerably reduced the immobilization and hospitalization time as it provide three-column biomechanical stability; however, with time it culminates in pain and deformity in cases of unstable burst fractures of thoracolumbar junction. Staged anterior corpectomy and mesh-cage implantation is a reliable surgical treatment in these patients. The advantages of this technique are complete kyphosis correction, immediate stability, preservation of kyphosis correction until fusion, and complete spinal canal decompression in case of neurological deficit. Anterior surgery along with posterior pedicle screw stabilization does give rigid stabilization and good clearance of the canal with satisfactory decompression of the spinal canal. It is proposed that surgical treatment providing a rigid spine capable of early bony arthrodesis should be advocated in cases of thoracolumbar burst fractures with complete paraplegia.

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Conflict of interest statement

The authors have no conflict of interest. They do not have financial relationship with any organization. This study is not sponsored.

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Authors and Affiliations

  1. Paraplegia Hospital, Civil Hospital, Ahmedabad, Gujarat, India

    Mukund M. Prabhakar & Lilam Patel

  2. Department of Orthopaedics, B.J. Medical College, Ahmedabad, Gujarat, India

    Mukund M. Prabhakar & Lilam Patel

  3. Marble City Hospital, Kishangarh, Ajmer, Rajasthan, India

    Bhagwat Singh Rao

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  1. Mukund M. Prabhakar
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  3. Lilam Patel
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Correspondence to Bhagwat Singh Rao.

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Statement regarding ethical standards: this study was performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and all persons gave their informed consent prior to inclusion in the study.

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Prabhakar, M.M., Rao, B.S. & Patel, L. Thoracolumbar burst fracture with complete paraplegia: rationale for second-stage anterior decompression and fusion regarding functional outcome. J Orthopaed Traumatol 10, 83–90 (2009). https://doi.org/10.1007/s10195-009-0052-8

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