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Zhu J, Feng D, Song D, Dai Z, Chen Y, Yan X, Li Z. Effect of Anterior Cervical Decompression Fusion and Partial Resection of Uncinate Vertebra Joint on Cervical Sagittal Sequence in Patients with Non-Single-Segment Radiculopathy and its Correlation with Curative Effect: A Retrospective Analysis. Orthop Surg 2023; 15:1085-1095. [PMID: 36750419 PMCID: PMC10102297 DOI: 10.1111/os.13676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 01/12/2023] [Accepted: 01/17/2023] [Indexed: 02/09/2023] Open
Abstract
OBJECTIVE Analyze the effect of preservation or resection of the partial uncinate joint on the sagittal sequence of the cervical vertebrae in patients with non-single-segment radiculopathy and the correlation between the sagittal sequence of the cervical vertebrae and the long-term effect after surgery, we explored whether it is necessary to perform partial resection of the uncinate joint in patients with cervical spondylotic radiculopathy undergoing anterior cervical decompression and fusion (ACDF). METHODS The study retrospectively analyzed 96 patients with cervical spondylotic radiculopathy with more than two segments from August 2016 to January 2021, who underwent ACDF (ACDF group, 45 patients) or ACDF combined with partial uncinate joint resection (ACDF + UT group, 51 patients). Partial resection of the uncinate joint indicated removal of part of the uncinate joint and osteophyte based on the compression of the nerve root during surgery, whereas the uncinate joints in the ACDF group were retained completely. The imaging data and functional scores of the two groups were recorded before surgery, 1 month after surgery, and at the last follow-up. A paired t-test or rank sum test was applied to analyze the data. In addition, the correlation between the imaging parameters and functional scores was validated using the Pearson's test. RESULTS All 96 patients successfully completed the surgery and were followed up for at least 12 months, with an average follow-up time of 14 months. At the last follow-up, the pain visual analog scale (VAS), neck disability index (NDI), and neck pain and disability scale (NPAD) scores of the two groups were significantly lower than those before surgery, and the Japanese Orthopaedic Association (JOA) score was significantly higher than that before surgery. At the last follow-up, compared with the ACDF+UT group, the NDI and NPAD scores in the ACDF group decreased more significantly (p < 0.05), and C2-7SVA, △C2-7SVA (the difference between C2-7 SVA at last follow-up and before operation), and T1S values decreased significantly (p < 0.05). The C2-7 Cobb angle was positively correlated with the JOA score and T1S (p < 0.05) and negatively correlated with the VAS, NDI, and NPAD scores and CGH-C7SVA (p < 0.05). C2-7SVA was positively correlated with CGH-C7SVA and T1S (p < 0.05). CONCLUSION Patients with non-single-segmental cervical spondylotic radiculopathy and ACDF with or without uncinate joint resection can have effective improvement in the clinical effect and sagittal balance; however, partial uncinate joint resection has a certain negative impact on the long-term reconstruction of sagittal balance and long-term effects in patients after surgery.
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Affiliation(s)
- Jieyang Zhu
- Department of Spine Surgery, the Second Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Dapeng Feng
- Department of Spine Surgery, the Second Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Dehui Song
- Department of Spine Surgery, the Second Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Zhong Dai
- Department of Spine Surgery, the Second Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Yaoning Chen
- Department of Spine Surgery, the Second Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Xiaobing Yan
- Department of Spine Surgery, the Second Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Zhengwei Li
- Department of Spine Surgery, the Second Affiliated Hospital of Dalian Medical University, Dalian, China
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Xue R, Ji ZY, Cheng XD, Zhang ZQ, Zhang F. Risk Factors for Dysphagia after Anterior Cervical Discectomy and Fusion with the Zero-P implant system: A Study with Minimum of 2 Years Follow-up. Orthop Surg 2021; 14:149-156. [PMID: 34841666 PMCID: PMC8755882 DOI: 10.1111/os.13170] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 09/24/2021] [Accepted: 10/19/2021] [Indexed: 12/25/2022] Open
Abstract
OBJECTIVE To evaluate the risk factors for dysphagia after anterior cervical discectomy and fusion (ACDF) with the Zero-P Implant System by multidimensional analysis and investigated the predictive values of these risk factors for dysphagia. METHODS A retrospective analysis of 260 patients who underwent ACDF with the Zero-P Implant System and had at least 2 year of follow-up were performed. All patients were divided into a non-dysphagia group and a dysphagia group. Sex, age, body mass index (BMI), intraoperative time, estimated blood loss, diabetes mellitus, hypertension, smoking, alcohol consumption, prevertebral soft-tissue thickness, the levels of surgery, O-C2 angle, C2-7 angle, T1 slope and segmental angle were analyzed. The Modified Japanese Orthopaedic Association (JOA) scoring system was used to determine functional status. NDI was used to evaluate neck pain and disability. The Bazaz grading system was chosen to evaluate dysphagia after surgery. Postoperative cerebrospinal fluid (CSF) leakage, infection, and dysphagia were recorded in both groups. An independent t-test was used to compare quantitative variables, a chi-square test was used to compare qualitative data between the two groups. To eliminate the influence of confounding factors, logistic regression was performed for multifactor regression of factors. The results were regarded as significant when the P-values were less than 0.05 in this study. RESULTS In total, the non-dysphagia group comprised 70 patients and the dysphagia group comprised 190 patients, with an average age of 58.33 ± 4.68 years (ranging, 42-82 years). These patients were followed up for 28.5 ± 3.5 months (range, 24-32 months). For clinical outcomes, both groups demonstrated significant improvement in the NDI and JOA scores (P < 0.001). According to the Bazaz dysphagia grading system, mild, moderate, and severe dysphagia were found in 50, 17, and 3 patients, respectively. In total, 37.1% (n = 26) had resolved by 3 month, 38.6% (n = 27) by 6 months, and 17.1% (n = 12) by 12 months. Chi-square test results indicated that number of operated levels, operation time dT1 slope, dO-C2 angle, dC2-7 angle, segmental angle and dPSTT were associated with a high incidence of dysphagia. Multivariate logistic regression analysis showed that number of operated levels, operation time, dC2-7 angle and dPSTT were significantly associated with postoperative dysphagia. CONCLUSIONS More operated levels, more operation time, more dC2-7 angle and dPSTT were the risk factors for postoperative dysphagia. In additional, sufficient preoperative preparation, evaluation combined with proficient and precise surgical treatment were suggested to reduce the incidence of postoperative dysphagia when ACDF was performed.
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Affiliation(s)
- Rong Xue
- Department of Orthopaedics, Xinghua People's Hospital, Taizhou, China.,Department of Orthopaedics, Affiliated Hospital of Nantong University, Nantong, China
| | - Zhu-Yong Ji
- Department of Orthopaedics, Xinghua People's Hospital, Taizhou, China
| | - Xing-Dong Cheng
- Department of Orthopaedics, Xinghua People's Hospital, Taizhou, China
| | - Zhu-Qiu Zhang
- Department of Orthopaedics, Xinghua People's Hospital, Taizhou, China
| | - Feng Zhang
- Department of Orthopaedics, Affiliated Hospital of Nantong University, Nantong, China
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Abudouaini H, Wu T, Liu H, Wang B, Chen H, Huang C, Hong Y, Meng Y. Partial uncinatectomy combined with anterior cervical discectomy and fusion for the treatment of one-level cervical radiculopathy: analysis of clinical efficacy and sagittal alignment. BMC Musculoskelet Disord 2021; 22:777. [PMID: 34511102 PMCID: PMC8436428 DOI: 10.1186/s12891-021-04680-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Accepted: 08/26/2021] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Biomechanical studies have demonstrated that uncovertebral joint contributes to segment mobility and stability to a certain extent. Simultaneously, osteophytes arising from the uncinate process are a common cause of cervical spondylotic radiculopathy (CSR). For such patients, partial uncinatectomy (UT) may be required. However, the clinical efficacy and sagittal alignment of partial UT during anterior cervical discectomy and fusion (ACDF) have not been fully elucidated. METHODS A total of 87 patients who had undergone single level ACDF using a zero-profile device from July 2014 to December 2018 were included. Based on whether the foraminal part of the uncovertebral joint was resected or preserved, the patients were divided into the ACDF with UT group (n = 37) and the ACDF without UT group (n = 50). Perioperative data, radiographic parameters, clinical outcomes, and complications were compared between the two groups. RESULTS The mean follow-up was 16.86 ± 5.63 and 18.36 ± 7.51 months in the ACDF with UT group and ACDF without UT group, respectively (p > 0.05). The average preoperative VAS arm score was 5.89 ± 1.00 in the ACDF with UT group and 5.18 ± 1.21 in the ACDF without UT group (p = 0.038). However, the average VAS arm score was 4.22 ± 0.64, 4.06 ± 1.13 and 1.68 ± 0.71, 1.60 ± 0.70 at 1 week post operation and at final follow up, respectively, (p > 0.05). We also found that the C2-7 SVA and St-SVA at the last follow-up and their change (last follow-up value - preoperative value) in the ACDF with UT group were significantly higher than ACDF without UT group (p < 0.05). No marked differences in the other cervical sagittal parameters, fusion rate or complications, including dysphagia, ASD, and subsidence, were observed. CONCLUSIONS Our result indicates that ACDF using a zero-p implant with or without partial UT both provide satisfactory clinical efficacy and acceptable safety. However, additional partial UT may has a negative effect on cervical sagittal alignment.
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Affiliation(s)
- Haimiti Abudouaini
- Department of Orthopedic Surgery, West China Hospital, Sichuan University, No. 37 Guo Xue Xiang Rd, Chengdu, China
| | - Tingkui Wu
- Department of Orthopedic Surgery, West China Hospital, Sichuan University, No. 37 Guo Xue Xiang Rd, Chengdu, China
| | - Hao Liu
- Department of Orthopedic Surgery, West China Hospital, Sichuan University, No. 37 Guo Xue Xiang Rd, Chengdu, China.
| | - Beiyu Wang
- Department of Orthopedic Surgery, West China Hospital, Sichuan University, No. 37 Guo Xue Xiang Rd, Chengdu, China
| | - Hua Chen
- Department of Orthopedic Surgery, West China Hospital, Sichuan University, No. 37 Guo Xue Xiang Rd, Chengdu, China
| | - Chengyi Huang
- Department of Orthopedic Surgery, West China Hospital, Sichuan University, No. 37 Guo Xue Xiang Rd, Chengdu, China
| | - Ying Hong
- Department of Anesthesia and Operation Center, West China school of Nursing, West China Hospital, Sichuan University, Chengdu, China
| | - Yang Meng
- Department of Orthopedic Surgery, West China Hospital, Sichuan University, No. 37 Guo Xue Xiang Rd, Chengdu, China
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Louie PK, Sexton AC, Bohl DD, Tabaraee E, Presciutti SM, Mayo BC, Paul JC, Saifi C, An HS. Rigid-Plating and Cortico-Cancellous Allograft Are Effective for 3-Level Anterior Cervical Discectomy and Fusion: Radiographic and Clinical Outcomes. Neurospine 2019; 17:146-155. [PMID: 31154693 PMCID: PMC7136101 DOI: 10.14245/ns.1836052.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Accepted: 01/06/2019] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVE To determine the risk factors associated with radiographic changes and clinical outcomes following 3-level anterior cervical discectomy and fusion (ACDF) using rigidplate constructs and cortico-cancellous allograft. ACDF has demonstrated efficacy for treatment of multilevel degenerative cervical conditions, but current data exists in small heterogeneous forms. METHODS A retrospective review included 98 patients with primary 3-level ACDF surgery at one institution from 2008 to 2013 with minimum 1-year follow-up. Cervical sagittal vertical axis (SVA), segmental height, fusion, and lordosis radiographs were measured preoperatively and at 2 postoperative periods. RESULTS Rates of asymptomatic pseudarthroses and total reoperations were 18% and 4%, respectively. Results demonstrated immediate improvements in cervical lordosis (5.5°, p < 0.01) and segmental height (5.0-mm increase, p < 0.01) with little changes in the cervical SVA (3.2-mm increase, p < 0.01). The segmental height decreased from immediate postoperative period to final follow-up (1.7-mm decrease, p < 0.01). Older age was protective against radiolucent lines (p < 0.05). Patient-reported outcomes significantly improved following surgery (p < 0.01). Current smoking status and diagnosis of diabetes mellitus had no impact on radiographic or clinical outcomes. Risk factors were not identified for the 5 reoperations (4%). CONCLUSION Three-level ACDF with rigid-plating and cortico-cancellous allograft is an effective procedure for degenerative diseases of the cervical spine without the application of additional adjuncts or combined anteriorposterior cervical surgeries. Significant improvements in cervical lordosis, segmental height, and segmental alignment can be achieved with little change in cervical SVA and a low rate of reoperations over short-term follow-up. Similarly, patient-reported outcomes show significant improvements.
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Affiliation(s)
- Philip K Louie
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Andrew C Sexton
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Danel D Bohl
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | | | | | - Benjamin C Mayo
- Department of Orthopaedics, University of Illinios at Chicago, Chicago, IL, USA
| | - Justin C Paul
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - Comron Saifi
- Department of Orthopaedic Surgery, University of Pennsylvania, Philadelphia, PA, USA
| | - Howard S An
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
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Zhang Y, Liu H, Yang H, Pi B. Relationship Between Sagittal Balance and Axial Symptoms in Patients with Cervical Spondylotic Myelopathy Treated with Anterior Cervical Discectomy and Fusion. J INVEST SURG 2019; 33:404-411. [PMID: 30905209 DOI: 10.1080/08941939.2018.1524948] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Purpose: The purpose of this study was to investigate the sagittal balance of the cervical spine and the clinical outcomes of anterior cervical discectomy and fusion (ACDF) for the treatment of cervical spondylotic myelopathy and to explore whether sagittal balance is related to the incidence of postoperative axial symptoms. Methods: Sixty-seven consecutive patients who underwent ACDF for the treatment of cervical spondylotic myelopathy from January 2014 to December 2016 were enrolled in our study. Sagittal balance parameters (global lordotic angle, segmented lordotic angle, T1 slope, and C2-7 sagittal vertical axis [C2-7 SVA] were recorded in the preoperative period and at 1 month, 3 months, and 1 year postoperatively. Clinical outcomes (JOA and NDI scores) and incidence of axial symptoms were also evaluated before and after surgery. Subgroup analysis included 20 patients with preoperative abnormal sagittal balance group (C2-7 SVA larger than 20 mm), and these patients were divided into two groups, namely axial symptom group and nonaxial symptom group. Result: The sagittal balance parameters (global lordotic angle, segmented lordotic angle, and TI slope) and the clinical outcomes after surgery significantly improved. The subgroup analysis within the preoperative abnormal sagittal balance group showed significant differences in postoperative and change in C2-7 SVA between patients with and without postoperative axial symptoms. Conclusion: ACDF can be applied to restore the sagittal alignment of the cervical spine and effectively improve clinical outcomes for the treatment of cervical spondylotic myelopathy. Sagittal balance improvement may be associated with the low incidence of postoperative axial symptoms for patients with abnormal cervical sagittal balance before surgery.
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Affiliation(s)
- Yijian Zhang
- Department of Orthopedic Surgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Hao Liu
- Department of Orthopedic Surgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Huilin Yang
- Department of Orthopedic Surgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Bin Pi
- Department of Orthopedic Surgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
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Abstract
STUDY DESIGN This was a prospective follow-up study. OBJECTIVE The main objective of this study was to evaluate the effects of sarcopenia on the sagittal alignment of the cervical spine after cervical laminoplasty in order to investigate the relationship between sarcopenia and spinal malalignment. SUMMARY OF BACKGROUND DATA Sarcopenia, a progressive and all over loss of skeletal muscle mass and strength associated with aging, has been reported to be related to spinal malalignment. The causes of poor surgical outcome after cervical laminoplasty have been examined in recent years, including the sagittal malalignment of the cervical spine. However, there are few reports about the impact of sarcopenia on the sagittal alignment of the cervical spine. MATERIALS AND METHODS A total of 171 patients who underwent cervical laminoplasty at our hospital between 2009 and 2015 were assigned to this study. The appendicular skeletal muscle mass [appendicular skeletal muscle index (SMI)] is commonly used to assess sarcopenia. Appendicular SMI (kg/m) was obtained from arm and leg muscle mass using dual-energy x-ray absorptiometry. Sanada and colleagues reference value for the Japanese appendicular SMI was used to diagnose sarcopenia. C2-C7 sagittal vertical axis (SVA), C2-C7 lordosis angle, and C2-C7 range of motion were measured for evaluation. The primary outcome was evaluated using the Japanese Orthopedic Association Score System for Cervical Myelopathy (JOA score) and the SF-36 Health Survey Physical Function (PF). RESULTS Of the 171 patients, 48 were diagnosed with sarcopenia. Preoperative (P=0.001), postoperative (P=0.011), and 1-year follow-up (P=0.007) C2-C7 SVA were greater in the sarcopenia group. Preoperative (P=0.009), postoperative (P=0.018), and 1-year follow-up (P=0.023) SF-36 scores were higher in the nonsarcopenia group. Preoperative (P<0.001), postoperative (P<0.001), and 1-year follow-up (P=0.002) JOA scores were higher in the nonsarcopenia group. C2-C7 SVA and JOA scores were negatively correlated at 1-year follow-up (R=-0.213, P=0.005). C2-C7 SVA and SF-36 scores were not correlated at 1-year follow-up (R=-0.167, P=0.070). CONCLUSIONS C2-C7 SVA was greater and postoperative outcome was worse after cervical laminoplasty in the sarcopenia group than in the nonsarcopenia group; thus, we believe it is necessary to evaluate sarcopenia before cervical laminoplasty, because sarcopenia may impact postoperative cervical alignment and postoperative outcome. LEVEL OF EVIDENCE Level III.
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Siasios I, Winograd E, Khan A, Vakharia K, Dimopoulos VG, Pollina J. Cervical sagittal balance parameters after single-level anterior cervical discectomy and fusion: Correlations with clinical and functional outcomes. JOURNAL OF CRANIOVERTEBRAL JUNCTION AND SPINE 2018; 9:56-62. [PMID: 29755238 PMCID: PMC5934966 DOI: 10.4103/jcvjs.jcvjs_9_18] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Background: Normal sagittal cervical alignment has been associated with improved outcome after anterior cervical discectomy and fusion (ACDF). Objective: The aim of this study is to identify alterations of cervical sagittal balance parameters after single-level ACDF and assess correlations with postoperative functionality. Methods: A retrospective chart review was performed between January 2010 and January 2014 to identify adult patients with no previous cervical spine surgery who underwent ACDF at any one level between C2 and C7 for the single-level degenerative disease. Tumor, infection, and trauma cases were excluded from the study. For the included cases, the following data were recorded preoperatively and 6 months–1 year after surgery: sagittal balance-marker measurements of the C1–C2 angle, C2–C7 angle, C7 slope, segmental angle at the operated level, and sagittal vertical axis (SVA) distance between C2 and C7, as well as the neck disability index and visual analog scale of pain. Results: The present study included 47 patients (average age: 51.2 years; range: 28–86 years). A moderate negative correlation between a smaller C2–C7 angle and the presence of right arm pain before treatment was found (P = 0.0281). Postoperatively, functionality scores significantly improved in all patients. C1–C2 angle increased with statistical significance (P = 0.0255). C2–C7 angle, segmental angle, C7 slope, and SVA C2–C7 distance did not change with statistical significance after surgery. C7 slope significantly correlated with overall cervical sagittal balance (P < 0.05). Conclusions: Single-level ACDF significantly increases upper cervical lordosis (C1–C2) without significantly changing lower cervical lordosis (C2–C7). The C7 slope is a significant marker of overall cervical sagittal alignment (P < 0.05).
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Affiliation(s)
- Ioannis Siasios
- Department of Neurosurgery, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, USA.,Department of Neurosurgery, Kaleida Health, Buffalo, New York, USA
| | - Evan Winograd
- Department of Neurosurgery, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, USA.,Department of Neurosurgery, Kaleida Health, Buffalo, New York, USA
| | - Asham Khan
- Department of Neurosurgery, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, USA.,Department of Neurosurgery, Kaleida Health, Buffalo, New York, USA
| | - Kunal Vakharia
- Department of Neurosurgery, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, USA.,Department of Neurosurgery, Kaleida Health, Buffalo, New York, USA
| | - Vassilios G Dimopoulos
- Department of Neurosurgery, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, USA.,Department of Neurosurgery, Kaleida Health, Buffalo, New York, USA
| | - John Pollina
- Department of Neurosurgery, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, USA.,Department of Neurosurgery, Kaleida Health, Buffalo, New York, USA
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Kato M, Namikawa T, Matsumura A, Konishi S, Nakamura H. Effect of Cervical Sagittal Balance on Laminoplasty in Patients With Cervical Myelopathy. Global Spine J 2017; 7:154-161. [PMID: 28507885 PMCID: PMC5415157 DOI: 10.1177/2192568217694011] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
STUDY DESIGN Retrospective clinical study. OBJECTIVE We evaluated the relationship between cervical sagittal alignment parameters and clinical status in patients with cervical myelopathy and analyzed the effect of cervical sagittal balance on cervical laminoplasty. METHODS Patients with cervical myelopathy (n = 110) who underwent laminoplasty were included in this study. The relationship between cervical sagittal alignment parameters and clinical status was evaluated. The changes in radiographic cervical sagittal parameters and clinical status 2 years after surgery were compared between patients with preoperative C2-7 SVA ≥35 mm (group A) and those with preoperative C2-7 SVA <35 mm (group B). RESULTS Preoperatively, C2-7 SVA had no correlation with defined health-related quality of life evaluation scores. At 2-year follow-up, the improvement in SF-36 physical component summary was significantly lower in group A than in group B. The postoperative change of C2-7 SVA did not significantly differ in 2 groups. Patients in group A maintained cervical regional balance after laminoplasty but experienced extensive postoperative neck pain. CONCLUSIONS Our patients with a C2-7 SVA of ≥35 mm maintained cervical regional balance after laminoplasty and their improvement in myelopathy was equivalent to that in patients with a C2-7 SVA of <35 mm. However, the patents with a C2-7 SVA of ≥35 mm experienced severe postoperative neck pain. C2-7 SVA is a parameter worth considering because it can lead to poor QOL and axial neck pain after laminoplasty.
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Affiliation(s)
- Minori Kato
- Osaka City General Hospital, Osaka, Japan
- Minori Kato, Department of Orthopaedic Surgery, Osaka City General Hospital, 2-13-22, Miyakojimahondori, Miyakojima-ku, Osaka, Japan.
| | | | | | - Sadahiko Konishi
- Osaka General Hospital of West Japan Railway Company, Osaka, Japan
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An Evidence-Based Stepwise Surgical Approach to Cervical Spondylotic Myelopathy: A Narrative Review of the Current Literature. World Neurosurg 2016; 94:97-110. [DOI: 10.1016/j.wneu.2016.06.109] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2016] [Revised: 06/25/2016] [Accepted: 06/27/2016] [Indexed: 12/17/2022]
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Weinberg DS, Chugh AJ, Gebhart JJ, Eubanks JD. Magnetic Resonance Imaging of the Cervical Spine Under-Represents Sagittal Plane Deformity in Degenerative Myelopathy Patients. Int J Spine Surg 2016; 10:32. [PMID: 27909653 DOI: 10.14444/3032] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND In treating patients with cervical myelopathy, surgical approach may be dictated by sagittal balance, highlighting the need for accurate pre-operative assessment. Magnetic Resonance Imaging (MRI) is widely-recognized for its utility in the diagnosis and surgical planning of cervical myelopathy. Plain radiographs (X-rays) are a reliable tool to assess bony alignment. However, they may not always be included in standard pre-operative evaluation, especially in an era of restricted payer-environments. Failure to appropriately acknowledge a patients' preoperative kyphotic deformity may cause the surgeon to choose a posterior-only approach, which would provide suboptimal sagittal plane correction and decompression of anterior pathology. METHODS 101 patients with cervical myelopathy with MRI and plain radiographs were identified. Cervical lordosis and kyphosis were measured using the Cobb method on standing lateral x-ray and sagittal T2-weighted MRI. CI (Ishihara) was also measured on standing lateral x-ray, and sagittal T2-weighted MRI. Bland-Altman plots were generated and used to compare subtle differences in measurement techniques and modalities. Odom's criteria were recorded. RESULTS The average difference between plain radiograph and MRI measurements for curvature angle was 3.5± 7.2 degrees (p< 0.001), and the average difference between plain radiograph and MRI measurements for curvature index was 1.5± 5.9 degrees (p= 0.015). CONCLUSIONS MRI may under-represent the respective sagittal plane deformity in patients with degenerative cervical myelopathy. CLINICAL RELEVANCE We would recommend the use of standing x-rays when considering surgical planning in all myelopathy patients. This manuscript was reviewed and approved by an institutional review board. Informed consent was not obtained because patient specific identifying information was not used. It was performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments.
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Affiliation(s)
- Douglas S Weinberg
- Department of Orthopaedic Surgery, Case Western Reserve University, Cleveland, Ohio
| | - Arunit J Chugh
- Department of Neurosurgery, Case Western Reserve University, School of Medicine, Cleveland, Ohio
| | - Jeremy J Gebhart
- Department of Orthopaedic Surgery, Case Western Reserve University, Cleveland, Ohio
| | - Jason D Eubanks
- Department of Orthopaedic Surgery, Case Western Reserve University, Cleveland, Ohio
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Is more lordosis associated with improved outcomes in cervical laminectomy and fusion when baseline alignment is lordotic? Spine J 2016; 16:982-8. [PMID: 27080410 DOI: 10.1016/j.spinee.2016.04.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Revised: 02/25/2016] [Accepted: 04/07/2016] [Indexed: 02/03/2023]
Abstract
BACKGROUND CONTEXT In cervical spondylotic myelopathy (CSM), cervical sagittal alignment (CSA) is associated with disease severity. Increased kyphosis and C2-C7 sagittal vertical axis (SVA) correlate with worse myelopathy and poor outcomes. However, when alignment is lordotic, it is unknown whether these associations persist. PURPOSE The study aimed to investigate the associations between CSA parameters and patient-reported outcomes (PROs) following posterior decompression and fusion for CSM when baseline lordosis is maintained. STUDY DESIGN/SETTING This is an analysis of a prospective surgical cohort at a single academic institution. PATIENT SAMPLE The sample includes adult patients undergoing primary cervical laminectomy and fusion for CSM over a 3-year period. OUTCOME MEASURES The PROs included EuroQol-5D, Short-Form-12 (SF-12) physical composite (PCS) and mental composite scales (MCS), Neck Disability Index, and the modified Japanese Orthopaedic Association scores. Radiographic CSA parameters measured included C1-C2 Cobb, C2-C7 Cobb, C1-C7 Cobb, C2-C7 SVA, C1-C7 SVA, and T1 slope. METHODS The PROs were recorded at baseline and at 3 and 12 months postoperatively. The CSA parameters were measured on standing radiographs in the neutral position at baseline and 3 months. Wilcoxon rank test was used to test for changes in PROs and CSA parameters, and Pearson correlation coefficients were calculated for CSA parameters and PROs preoperatively and at 12 months. No external sources of funding were used for this work. RESULTS There were 45 patients included with an average age of 63 years who underwent posterior decompression and fusion of 3.7±1.3 levels. Significant improvements were found in all PROs except SF-12 MCS (p=.06). Small but statistically significant changes were found in C2-C7 Cobb (mean change: +3.6°; p=.03) and C2-C7 SVA (mean change: +3 mm; p=.01). At baseline, only C2-C7 SVA associated with worse SF-12 PCS scores (r=-0.34, p=.02). Postoperatively, there were no associations found between PROs and any CSA parameters. Similarly, no CSA parameters were associated with changes in PROs. CONCLUSIONS Although creating more lordosis and decreasing SVA are associated with improved myelopathy and outcomes in patients with kyphosis, our study did not find such associationsin patients with lordosis undergoing posterior laminectomy and fusion for CSM. This suggests that any amount of lordosis may be sufficient.
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Emery SE. Anterior approaches for cervical spondylotic myelopathy: which? When? How? EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2015; 24 Suppl 2:150-9. [PMID: 25652554 DOI: 10.1007/s00586-015-3784-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Revised: 01/27/2015] [Accepted: 01/27/2015] [Indexed: 11/25/2022]
Abstract
Cervical spondylotic myelopathy is a degenerative disorder with an unfavorable natural history. Surgical treatment options have evolved substantially over time, with both anterior and posterior methods proving successful for certain patients with specific characteristics. Anterior decompression of the spinal canal plus fusion techniques for stabilization has several advantages and some disadvantages when compared to posterior options. Understanding the pros and cons of the approaches and techniques is critical for the surgeon to select the best operative treatment strategy for any given patient to achieve the best outcome. Multiple decision-making factors are involved, such as sagittal alignment, number of levels, shape of the pathoanatomy, age and comorbidities, instability, and pre-operative pain levels. Any or all of these factors may be relevant for a given patient, and to varying degrees of importance. Choice of operative approach will therefore be dependent on patient presentation, risks of that approach for a given patient, and to some degree surgeon experience.
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Affiliation(s)
- Sanford E Emery
- Department of Orthopaedics, West Virginia University, PO Box 9196, Morgantown, WV, 26506-9196, USA,
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Postoperative cervical sagittal imbalance negatively affects outcomes after surgery for cervical spondylotic myelopathy. Spine (Phila Pa 1976) 2014; 39:2070-7. [PMID: 25419682 PMCID: PMC4254605 DOI: 10.1097/brs.0000000000000641] [Citation(s) in RCA: 111] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN Prospective observational cohort study. OBJECTIVE To determine if postoperative cervical sagittal balance is an independent predictor of health-related quality of life outcome after surgery for cervical spondylotic myelopathy. SUMMARY OF BACKGROUND DATA Both ventral and dorsal fusion procedures for CSM are effective at reducing the symptoms of myelopathy. The importance of cervical sagittal balance in predicting overall health-related quality of life outcome after ventral versus dorsal surgery for CSM has not been previously explored. METHODS A prospective, nonrandomized cohort of 49 patients undergoing dorsal and ventral fusion surgery for CSM was examined. Preoperative and postoperative C2-C7 sagittal vertical axis was measured on standing lateral cervical spine radiographs. Outcome was assessed with 2 disease-specific measures-the modified Japanese Orthopedic Association scale and the Oswestry Neck Disability Index and 2 generalized outcome measures-the Short-Form 36 physical component summary (SF-36 PCS) and Euro-QOL-5D. Assessments were performed preoperatively, and at 3 months, 6 months, and 1 year postoperatively. Statistical analyses were performed using SAS version 9.3 (SAS Institute). RESULTS Most patients experienced improvement in all outcome measures regardless of approach. Both preoperative and postoperative C2-C7 sagittal vertical axis measurements were independent predictors of clinically significant improvement in SF-36 PCS scores (P = 0.03 and P = 0.02). The majority of patients with C2-C7 sagittal vertical axis values greater than 40 mm did not improve from an overall health-related quality of life perspective (SF-36 PCS) despite improvement in myelopathy. The postoperative sagittal balance value was inversely correlated with a clinically significant improvement of SF-36 PCS scores in patients undergoing dorsal surgery but not ventral surgery (P = 0.03 vs. P = 0.93). CONCLUSION Preoperative and postoperative sagittal balance measurements independently predict clinical outcomes after surgery for CSM. LEVEL OF EVIDENCE 2.
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Heary RF, Choudhry OJ, Jalan D, Agarwal N. Analysis of cervical sagittal alignment after screw-rod fixation. Neurosurgery 2013; 72:983-91; discussion 991-2. [PMID: 23442516 DOI: 10.1227/neu.0b013e31828e20ff] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND The use of posterior instrumentation constructs is well established for subaxial cervical stabilizations/fusions. The importance of global and regional sagittal alignment has become increasingly recognized. OBJECTIVE To perform an analysis using computed tomography scans to determine the effect of posterior instrumentation on postoperative cervical sagittal alignment at long-term follow-up. METHODS Over a period of 6 years, 56 consecutive patients (38 male and 18 female patients; mean age, 47 years) underwent cervical screw-rod fixation. Plain radiographs, computed tomography scans, and magnetic resonance images were analyzed preoperatively to assess sagittal alignment (C2-C7). Postoperatively, computed tomography scans and serial radiographs were obtained in all patients. With the use of independent observers, changes in sagittal alignment were determined by comparing the preoperative and postoperative imaging studies. RESULTS In total, 390 screws were placed in the cervical spines of 56 patients. Definitive radiographic fusion was detected in all 56 patients (100%). There were no incidences of instrumentation failures or lucencies surrounding any screws. Patients with preoperative kyphosis (n = 19; mean, +9.9°) improved their sagittal alignment by 6.5° (final mean, +3.4°), whereas patients with preoperative lordosis (n = 37; mean -15.44°) maintained their lordosis (final mean, -15.3°). Mean duration of follow-up was 32.5 months. CONCLUSION Radiographic analysis showed lateral mass fixation to be safe and effective. Certain operative techniques allowed substantial deformity correction and maintenance of long-term correction of deformity. Screw-rod fixation may be an effective method for maintaining lordotic cervical alignment in previously lordotic patients and for significantly correcting kyphotic deformity in patients with a preoperative kyphosis.
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Affiliation(s)
- Robert F Heary
- Department of Neurological Surgery, University of Medicine and Dentistry of New Jersey, New Jersey Medical School, Newark, New Jersey 17101-1709, USA.
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Lazaro BCR, Yucesoy K, Yuksel KZ, Kowalczyk I, Rabin D, Fink M, Duggal N. Effect of arthroplasty design on cervical spine kinematics: analysis of the Bryan Disc, ProDisc-C, and Synergy Disc. Neurosurg Focus 2010; 28:E6. [DOI: 10.3171/2010.3.focus1058] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Object
Cervical total disc replacement has emerged as a surgical option to preserve motion and potentially avoid adjacent-segment disease after anterior cervical discectomy and fusion. Recently, much attention has been directed at the ability of a given device to maintain and/or restore normal segmental alignment. Nonphysiological disc and segmental angulation could result in increased stresses transmitted to the facet joints and posterior elements, conflicting with the essence of arthroplasty and potentially leading to adjacent-segment disease. The goal of this study was to contrast device alignment and segmental kinematics provided by 3 different cervical disc prostheses.
Methods
Sixty patients were retrospectively analyzed and divided into 3 groups receiving the Bryan, ProDisc-C, or Synergy disc. Only single-level arthroplasty cases were included in the study. Lateral dynamic radiographs of the cervical spine were analyzed using quantitative motion analysis software (Medical Metrics, Inc.) to analyze the kinematics at the index level both preoperatively and postoperatively. Several parameters were noted, including range of motion, disc angles, shell angles, anterior and posterior disc heights, translation, and center of rotation. Preoperative and postoperative data were compared using the Student t-test with a significance level of p < 0.05.
Results
Postoperatively, all 3 disc groups maintained adequate range of motion at the implanted level. With respect to the shell angles, the Synergy disc demonstrated the least variability, maintaining 6° lordotic configuration between the device endplates. In the Bryan disc group, significant shell kyphosis developed postoperatively (p < 0.0001). Both ProDisc-C and Synergy discs significantly increased anterior and posterior disc heights (p < 0.0001). The Bryan and Synergy discs maintained the natural center of rotation, whereas significant anterior shift occurred with ProDisc-C.
Conclusions
The goal for motion preservation at the implanted level was achieved using all 3 devices. The Synergy disc was unique in its ability to alter device angulation by 6°. The Bryan disc demonstrated device endplate kyphosis. Both the Synergy disc and ProDisc-C increased disc space height.
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Affiliation(s)
| | - Kemal Yucesoy
- 2Department of Neurosurgery, Faculty of Medicine, Dokuz Eylul University, Izmir; and
| | - Kasim Z. Yuksel
- 3Department of Neurosurgery, Faculty of Medicine, Kahramanmaras Sutcu Imam University, Kahramanmaras, Turkey
| | - Izabela Kowalczyk
- 4Department of Medical Biophysics, The University of Western Ontario, London, Ontario, Canada
| | - Doron Rabin
- 1Department of Clinical Neurological Sciences, Division of Neurosurgery
| | - Marie Fink
- 1Department of Clinical Neurological Sciences, Division of Neurosurgery
| | - Neil Duggal
- 1Department of Clinical Neurological Sciences, Division of Neurosurgery
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