Anterior discectomies and interbody cage fusion without plate fixation for 5-level cervical degenerative disc disease: A 5-year follow-up

Morphology of Herniated Disc as a Predictor for Outcomes of Posterior Percutaneous Full-endoscopic Cervical Discectomy in Treating Cervical Spondylotic Radiculopathy

Objective

To quantitively characterize the morphology of cervical disc herniation (CDH) causing cervical spondylotic radiculopathy (CSR) and investigate whether the morphological features of CDH are associated with clinical outcomes in CSR patients treated by posterior percutaneous full‐endoscopic cervical discectomy (PPECD).

Methods

This is a single‐center retrospective study. Eighty‐seven PPECD‐treated patients meeting the inclusion criteria were included between May 2017 and May 2019. Based on preoperative T2‐weighted magnetic resonance imaging (MRI), we designed and measured six morphological parameters of CDH for all patients to reflect its relative position to cervical spinal cord and protruding degree: DC‐SC distance from the center of disc (DC) and the center of spinal cord (SC); DC‐DP distance from the center of cervical disc (DC) to the peak of herniation (DP); internal diameter of the disc; axial length of CDH; central angle of CDH formed by central axes of CDH and spinal cord; the modified index of CDH. We recorded general information, neck disability index (NDI) scores, visual analog scale (VAS) scores of neck and arm of all patients preoperatively and postoperatively at 1‐year follow‐up. The association of preoperative general variables and morphological parameters with clinical outcomes were explored by utilizing logistic regression and receiver operating characteristic curve (ROC) analysis.

Results

The preoperative neck‐VAS, arm‐VAS, and NDI were significantly decreased after PPECD and remained at a low value at follow‐up. In regards to the morphological parameters of CDH, the mean value of DC‐SC distance, DC‐DP distance, internal diameter of the disc, axial length of CDH, central angle of CDH, and modified index of CDH were 1.61 ± 0.30 cm, 1.66 ± 0.32cm, 1.04 ± 0.21 cm, 0.63 ± 0.19cm, 39.38° ± 11.94°, and 0.39 ± 0.24, respectively. For patients grouped by difference in the recovery rate of NDI and arm‐VAS (excellent improved group, EI; and limited improved group, LI), there were no differences in the age, gender, surgical segments, and morphological parameters, except for the central angle of CDH. According to binary logistic regression analysis, only the preoperative central angle of CDH was significantly associated with postoperative NDI recovery (odds ratio: 0.873; 95% confidence interval: 0.819–0.931, P = 0.002). ROC analysis showed the optimal cut‐off value of the central angle of CDH for predicting the postoperative improvement of functional outcomes is 33.788°.

Conclusion

Preoperative morphology of CDH is related to the outcomes of CSR patients after PPECD. Patients with a large central angle of CDH (>33.788°) have more likelihood of ameliorating neurological symptoms of CSR. There is the potential to select the central angle of CDH as a predictor for outcomes of PPECD in treating CSR.

Long-term Outcome Following Three-Level Stand-Alone Anterior Cervical Discectomy and Fusion: Is Plating Necessary?

Background:

Anterior cervical discectomy with fusion (ACDF) is a proven method for the treatment of selected patients. The necessity of use of an anterior plate is controversial. The article aims to assess the fusion rates (FRs) and long-term outcomes following three-level ACDF.

Materials and Methods:

Data were collected from the medical records of patients operated on due to degenerative cervical disease. All patients were treated with three-level ACDF employing polyether ether-ketone cages without anterior plating. Visual analog scale (VAS), neck disability index (NDI), and plain radiographs were used in the clinical and radiological postsurgery assessment. Fusion evaluation was performed according to the <1 mm motion between spinous processes rule. Subsidence was defined as a more than 2 mm decrease in the interbody height.

Results:

A total of 234 treated levels on 78 patients were assessed. The mean presurgery NDI score was 23.07 ± 4.86, with a mean disability of 46.03% ± 9.64. The mean presurgery VAS score of the neck was 7.58 ± 0.85, while VAS score of the arm was 7.75 ± 1.008. Post surgery, NDI stated no disability, while VAS score of the neck and arm showed no presence of pain. The mean FR was 19.50 ± 21.71 levels per month, with a peak from 3^rd to 6^th month. Presurgery evaluation showed 12 (15.38%) patients with a high T2 sequence signal. Magnetic resonance imaging screening detected 31 (39.24%) patients with coexisting cervical and lumbar findings. Post surgery, transient dysphagia was reported by 1 patient (1.28%), while subsidence was registered in 15 (6.41%) levels, situated in 12 patients (15.38%), most often at C_6-7 (66.6%). Clinical and radiological follow-up extended to 69.47 ± 11.45 months.

Conclusion:

Multilevel stand-alone ACDF is a safe, cost-effective procedure providing favorable clinical and radiological results with minimal complications. The incidence of subsidence is usually clinically insignificant and can be decreased with a careful surgical technique.

Spinal Cord Injury Due to Cervical Disc Herniation without Bony Involvement Caused by Wrestling - A Case Report

Introduction:

Many cases of cervical spinal disc herniation caused by sporting injury have been reported. Those cases generally accompanied high-energy trauma such as fractures and/or dislocations. The purpose is to present the case of spinal cord injury (SCI) due to cervical disc herniation without bony involvement caused by wrestling.

Case Report:

We report a case of a 23-year-old man who sustained a cervical SCI during the wrestling competition. He was quadriplegic with no sensory or motor function preserved in sacral segments S4-S5. Conventional radiographs and computed tomography did not reveal bony abnormalities. Magnetic resonance imaging (MRI) showed a free herniated cervical disc severely compressing the spinal cord from central at C3/4 level. He underwent anterior cervical discectomy and interbody fusion using autologous iliac crest bone graft and fixation with the cervical plate. He made an eventful recovery, and 5 years later, he was playing at high competitive level.

Conclusion:

Competitive wrestling-related injuries are quite high. Fortunately, the incidence of SCI among wrestlers is extremely low. Although rare, SCI due to cervical disc herniation without bony involvement is a serious debilitating injury that exerts a devastating effect on a wrestler from a physical, psychological, and socioeconomic point of view, and places an immense burden on society from a public health perspective. The MRI is the golden examination in diagnosing such lesion. The management comprises surgical decompression of neural elements, stabilization, and fusion to provide a higher recovery rate from cord damage to return to play. Wrestler who is completely pain free with full range of motion and strength may be eligible for return to play.

Early presentation of traumatic cervical disc herniation with neurologic deficit and without an adjacent bone lesion

AIM OF THE STUDY

The purpose of this study was to explore clinical features and the operational opportunity of traumatic cervical disc herniation.

METHOD

Patients with cervical spine injury (413) were retrospectively reviewed. Six patients with neurological deficits were identified to have disc herniation without adjacent bone lesion. The diagnosis was confirmed by MRI. The Japanese Orthopedic Association (JOA) score was used to assess the severity of clinical symptoms. Different grading systems have been used in analyzing various stages of herniated cervical discs. All patients underwent anterior cervical decompression, insertion of autologous iliac crest graft, and fixation with cervical plate.

RESULTS

The causes of injury were road traffic accidents in four patients and sport and domestic accidents in one patient each. There were five patients with single intervertebral disc herniation and one patient with double. Pre-operative JOA score was 14 for three patients, the remaining three patients scored 10, 6, and 3 respectively. At final follow-up, the score was 17 for four patients and 14 for two patients.

DISCUSSION

Traumatic cervical disc herniation with neurologic deficit and without adjacent bone lesion is a rare condition. MRI is the golden examination to confirm diagnosis. Early recognition is essential for appropriate therapy and to minimize the extent of neurological deficit.

CONCLUSION

The MRI is mandatory in diagnosing different types of traumatic herniated cervical disc. Discectomy and anterior cervical interbody fusion using autologous iliac crest graft are the treatment options.