Journal of Craniovertebral Junction and Spine

: 2018  |  Volume : 9  |  Issue : 3  |  Page : 170--174

Comparison of the outcomes of cage-stand-alone with cage-with-plate fixation in one level and two levels for treating cervical disk diseases

Mohammadreza Etemadifar1, Ali Andalib1, Hossein Shafiee1, Milad Kabiri Samani2,  
1 Department of Orthopedic Surgery, Al Zahra Educational Hospital, Isfahan University of Medical Sciences, Isfahan, Iran
2 School of Medicine, Mazandaran University of Medical Sciences, Sari, Iran

Correspondence Address:
Dr. Ali Andalib
Department of Orthopedic Surgery, Al Zahra Educational Hospital, Isfahan University of Medical Sciences, Isfahan


Introduction: Anterior cervical discectomy and fusion (ACDF) surgery is an accepted method for many spinal cord abnormalities. The purpose of this study was to evaluate the outcomes of treating patients with spinal cord lesions at one level or two levels through ACDF with cage-stand-alone (ACDF-CA) and ACDF with cage-with-plate fixation (ACDF-CP) surgery and comparing these results with each other. Methods: In this prospective, cross-sectional, descriptive study, eighty patients undergoing ACDF surgery were enrolled according to the inclusion and exclusion criteria. Demographic data, before and after surgery findings, and clinical symptoms were investigated. Data were collected by means of visual analog scale (VAS) and Neck Disability Index (NDI) questionnaires. The adverse effects and surgical outcomes were evaluated based on Odom's criteria and patients' satisfaction. The collected data of the groups were then compared and assessed. Results: There was no significant difference between the groups in regards of gender, age, duration of surgery to visit, surgical level, preoperative and postoperative VAS and cervical range of motion, preoperative NDI, results based on Odom's criteria, and satisfaction of patients (P > 0.05). The VAS, NDI, and range of motion scores were significantly reduced in the four groups after the operation compared to the preoperative stage. Postoperative NDI scores in the ACDF-CA group at one level were significantly lower than other groups (P < 0.05). Conclusion: Both of the methods revealed acceptable outcomes in comparison to the preoperative stage, and despite some minor differences, there are generally no significant differences in outcomes and complications.

How to cite this article:
Etemadifar M, Andalib A, Shafiee H, Samani MK. Comparison of the outcomes of cage-stand-alone with cage-with-plate fixation in one level and two levels for treating cervical disk diseases.J Craniovert Jun Spine 2018;9:170-174

How to cite this URL:
Etemadifar M, Andalib A, Shafiee H, Samani MK. Comparison of the outcomes of cage-stand-alone with cage-with-plate fixation in one level and two levels for treating cervical disk diseases. J Craniovert Jun Spine [serial online] 2018 [cited 2022 Aug 20 ];9:170-174
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Anterior cervical discectomy and fusion (ACDF) is an accepted surgical procedure for many spinal cord and cervical abnormalities such as spondylolysis, intervertebral disc herniation, fractures, and neoplastic lesions, first developed in the 1950s by Smith and Robinson.[1] This surgical technique is considered a relatively safe and effective method for the mentioned cases, as well as degenerative spinal cord diseases. However, complications such as incomplete decompression, recurrence of myelopathy due to degeneration, protrusion of adjacent segment, and bone fractures have been reported for it.[2] To establish a stable fusion, the graft should be capable of osteogenesis, osteoinduction, and osteoconduction. Autograft and allograft are used in this method, and autograft includes all three of the mentioned characteristics.[3] Iliac and fibula bones are commonly used as autologous grafts, and the role of the fibula in maintaining disc height is reported to be more significant.[4] These lesions also have some imperfections, for example, autograft involves complications such as seroma, hematoma, femoral neck fractures, and infections.[1],[5] On the other hand, the allograft is more expensive than autograft and may have a lower fusion rate and a higher risk of infection.[6] Using artificial grafts or prosthetics such as cage can be helpful in reducing the time of surgery alongside having fewer side effects and more fusion rate than autograft.[7],[8] Cage-stand-alone (CA) and cage-with-plate fixation (CP) are two techniques in this regard.[9] The presence of the plate helps maintain the stability of the fusion structure, and the CA method is more beneficial in terms of ease of use plus reducing surgical time and blood loss.[10] Comparison of CA with CP has revealed different results in several studies. Some studies have shown higher levels of fusion and decreased subsidence levels in the CP technique than the CA method.[11],[12] Some other studies have reported the absence of any differences between the two methods.[10],[13] In other studies, reduction in complications such as dysphagia and the possibility of early postoperative discharge are discussed as the superiority aspects of the CA method.[14] Considering the differences between the results of similar studies and the limited number of studies which compared these two methods in one and two levels, the purpose of the current study was to evaluate the outcomes of treating patients with spinal lesions in one level or two levels through ACDF-CA and ACDF-CP methods and compare these results with each other.


In this prospective, cross-sectional, descriptive study, eighty ACDF surgery candidate patients, who were referred to the orthopedic clinics of Al-Zahra and Kashani Hospitals in Isfahan between 2015 and 2017, were selected and involved in the study. The sample size of the patients included twenty patients with ACDF-CA surgery in one level, twenty patients with ACDF-CA surgery in two levels, twenty patients with ACDF-CP in one level, and twenty patients with ACDF-CP in two levels who all fulfilled the inclusion criteria for entering the study. It should be noted that the sampling continued until the involvement of twenty patients in each group. The inclusion criteria for the study included patients who underwent ACDF-CA and ACDF-CP surgery aged between 20 and 70 years, which at least 2 months had passed from their surgery. Patients who had incomplete records or imaging data, special medications employed within the treatment period such as corticosteroids, had a history of postoperative re-trauma, or did not consent to participate in the study were excluded from the study. Demographic data (age and sex), clinical symptoms, radiological findings, and cervical spine X-ray, and magnetic resonance imaging before surgery were the evaluated data of the study. The tools for collecting information in this study were the visual analog scale (VAS) (the score of postoperative pain that was rated between 0 and 10 according to the patient's statement) and questionnaire of Neck Disability Index (NDI) (before and after surgery). The NDI is a marker for neck disability rating with ten questions including pain intensity, personal care, lifting, reading, headaches, concentration, work, driving, sleeping, and recreation. Each question is scored from 0 to 5 points. In the end, the questionnaire score is demonstrated in percentage. It should be noted that higher scores obtained from this questionnaire would indicate more disability of the patients.[15] Surgery levels were C3-C4-C5, C4-C5-C6, and C5-C6-C7, and the interval between vertebras was determined based on the patient's X-ray imaging data. The cervical range of motion (cROM) was measured before and after surgery. It is worth mentioning that the anterior cervical approach was the method used for surgery. Side effects of the procedure include displacement, subsidence, screw loosening, and respiratory or esophagus complications. Furthermore, the outcomes of the surgery based on Odom's criteria were excellent (improved symptoms and abnormal findings before the operation), good (persistence of symptoms at a minimal level before surgery), fair (definite relief of some preoperative symptoms, slightly improved other symptoms with residual root irritation with transient pain), and poor (worsened or unchanged symptoms).[16] Patients' satisfaction from the surgical operation was also documented as completely satisfied, satisfied, and dissatisfied.

Statistical analysis

The data of this study were entered into SPSS v. 22 software Statistical Package for the Social Sciences (SPSS, IBM, Chicago, IL), and Chi-square test was used to compare the qualitative data between the groups. The one-way ANOVA test was used for quantitative data. Paired samples t-test was used to evaluate the results before and after surgery. Quantitative data were presented as the mean and standard deviation and qualitative data were presented as frequency or percentage. The P < 0.05 was considered as a significant relationship.


In this study, patients were divided into four groups: ACDF-CA in one level (15 males and 5 females), ACDF-CA in two levels (11 males and 9 females), ACDF-CP in one level (13 males and 7 females), and ACDF-CP in two levels (9 men and 11 women). Furthermore, there was no significant difference between the groups according to gender, age, duration of surgery to visit, and surgical level (P > 0.05). Patient's demographic information is summarized in [Table 1].{Table 1}

VAS, NDI, and range of motion were measured before and after surgery. Paired sample t-test showed a significant decrease in VAS, NDI, and range of motion scores after surgery compared with the preoperative stage in the four groups (P < 0.001). Furthermore, according to one-way ANOVA test, there was no significant difference between the groups in regards to VAS and range of motion before and after surgery operation and NDI before surgery operation (P > 0.05), but there was a significant difference between the groups according to the NDI scores in the postoperative period, as the postoperative NDI scores in the ACDF-CA group in one level were lower than the other groups (P < 0.0001) [Table 2].{Table 2}

Patients' surgery outcomes were discussed according to Odom's criteria and patients' satisfaction with the surgery, as most patients were in a good state based on the Odom's criteria, and most of the patients were satisfied with their surgery. There was also no significant difference between the groups in regards to Odom's criteria for patients' satisfaction (P > 0.05) [Table 3].{Table 3}

Among the complications found in this study, only one case (5%) of the ACDF-CA in two levels had displacement, and no other complications such as subsidence, screw loosening, and respiratory or esophageal problems were seen in other groups. Furthermore, There was no significant difference in postoperative complications between the groups (P = 0.38).


ACDF-CA and ACDF-CP are discussed in various studies from the perspective of postoperative pain, neck disability after surgery, the different cROM rates, and side effects of surgery. These studies evaluated one level, two levels, and even three levels, but studies which compared the levels with each other are limited. In this study, age, sex, surgery duration, and surgical levels were not different between the groups. In all of the examined groups, VAS, NDI, and range of motion were significantly reduced after surgery compared to the preoperative state. Furthermore, VAS and range of motion after surgery did not reveal statistically significant differences between all of the methods [Figure 1]. This result is consistent with the results of various studies in this regard. However, Lee et al. studied different ACDF techniques at one level and stated that ACDF-CP technique was significantly more effective than ACDF-CA in reducing postoperative VAS.[17] In the study of Song et al., who compared ACDF-CA with ACDF-CP in one level and two levels, the VAS score in the ACDF-CA group was higher than in the other group.[18] In the ACDF-CA technique, due to the lack of strong fixations to maintain the stability of the device, the anatomical differences between individuals, and the limited designs of the embedded device, micromotions may occur occasionally, which leads to a slower bone fusion process. Together with the increased tension in the posterior cervical region, these factors together can explain the causes of the pain difference in the two methods. In our study, postoperative NDI in the ACDF-CA group in one level was lower than in other groups. In a study by Kim et al., who similarly evaluated ACDF with cage-only and ACDF-CP in one level and two levels, postoperative NDI in cage-only in one level group was lower than the CP group.[10] Comparison of NDI after surgery in two levels did not demonstrate significant differences in both groups. These findings are consistent with the results of our study. On the other hand, Chen et al. who studied ACDF-CA and ACDF-CP in three levels suggested that postoperative NDI had a significant improvement rather than preoperative state, and postoperative differences were not significant between the two methods.[19] Other relative studies have been conducted with similar results in this regard.[20] It is possible that the reason for these results is the plate used or complications such as adjacent segmental degeneration which occurs less in cage-only technique. In our study, based on Odom's criteria, the outcomes of the surgery were evaluated, which revealed no significant differences between the groups. In addition, the patients' satisfaction of the surgery operation was observed in most of the cases, without significant differences in all groups. In most of the methods evaluated, no complications were observed. In a study by Lee et al., who used this criterion in a similar way, the results did not reveal significant differences between groups in one level.[17] No complications such as neurological disorders have also been reported in this study. These results are consistent with our findings. In a study by Song et al., the results were analyzed using Robinson's criteria, which did not report any significant differences in the examined methods.[18] In their study, complications have been reported for both methods. Pseudarthrosis, need for revision operation, and anterior migration of cage were significantly higher in the group treated with the ACDF-CA method. Hardware problems such as plate bending or screw back-out were reported more in the ACDF-CP group. The incidence of adjacent level degeneration and swallowing difficulties was similar in both groups. The more significant occurrence of pseudoarthrosis in the ACDF-CA group seems to be related to the development of cage subsidence and kyphotic deformity. Failure to maintain stability in the ACDF-CA method (which does not utilize plate) can also be the reason for more cage displacement in this process. In this regard, although the results of this study are not similar to our findings, they can be explained in the light of the above considerations.{Figure 1}

Study limitations

One of the limitations of the present study is the lack of involvement of a control group for comparing the results. Furthermore, the fusion rate has not been evaluated in different groups. Moreover, details of VAS, NDI and range of motion at different times are not provided. In addition to other facts, costs of each method have not been investigated in this study. These items should be considered in further studies in this regard.


ACDF-CA and ACDF-CP in one level and two levels revealed acceptable postoperative outcomes than before surgery. The complications of these methods are negligible and satisfaction level after surgery is high. Although the ACDF-CA method in one level may be associated with decreased neck disability, the results of these methods are generally the same. Further studies with more sample sizes are recommended to evaluate the cost efficiency of these methods and more precise details such as VAS or NDI measurements at different times should be provided.

Financial support and sponsorship


Conflicts of interest

There are no conflicts of interest.


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