The Experts below are selected from a list of 102 Experts worldwide ranked by ideXlab platform
Sakae Tanaka - One of the best experts on this subject based on the ideXlab platform.
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cervical Anterolisthesis a predictor of poor neurological outcomes in cervical spondylotic myelopathy patients after cervical laminoplasty
Spine, 2016Co-Authors: Takeshi Oichi, Yasushi Oshima, Yuki Taniguchi, Yoshitaka Matsubayashi, Hirotaka Chikuda, Katsushi Takeshita, Sakae TanakaAbstract:STUDY DESIGN A retrospective cohort study. OBJECTIVE To clarify the influence of cervical spondylolisthesis on neurological outcomes in cervical spondylotic myelopathy (CSM) patients after cervical laminoplasty. SUMMARY OF BACKGROUND DATA Studies focusing on the surgical outcomes in CSM patients with cervical spondylolisthesis are limited. METHODS We retrospectively reviewed 125 CSM patients after cervical laminoplasty. Neurological outcomes were evaluated by calculating the Japanese Orthopedic Association (JOA) recovery rate at 2 years after surgery. We defined Anterolisthesis as a more than 3-mm anterior vertebral displacement in a flexion radiograph and retrolisthesis as a more than 3-mm posterior vertebral displacement in an extension radiograph. We further assessed potential risk factors for poor neurological outcomes after cervical laminoplasty, including cervical alignment, degree of spinal cord compression, duration of myelopathic symptoms, diabetes mellitus, and preoperative JOA score. Multivariate logistic regression analysis was performed to investigate the risk factors for poor outcomes (JOA recovery rate <50%) after cervical laminoplasty. RESULTS Our study included 86 men and 39 women with mean age of 64 (range, 30-89) years. Average JOA scores were 9.9 and 13.3 points before and at 2 years after surgery, respectively. Average recovery rate was 47.2% (range, -68% to 100%), with 62 patients having poor outcomes (JOA recovery rate <50%) at 2 years after surgery. Anterolisthesis and retrolisthesis were observed in 13 and 24 patients, respectively. Multivariate logistic regression analysis revealed that the Anterolisthesis was a significant risk factor for poor outcomes (JOA recovery rate <50%) after cervical laminoplasty (P = 0.01), whereas retrolisthesis did not affect the neurological outcomes (P = 0.6). CONCLUSION Anterolisthesis, but not retrolisthesis, is a significant risk factor for and predictor of poor neurological outcomes after cervical laminoplasty. Cervical laminoplasty should not be considered in CSM patients with Anterolisthesis. LEVEL OF EVIDENCE 2.
Kotaro Nishida - One of the best experts on this subject based on the ideXlab platform.
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lumbar multilevel degenerative spondylolisthesis radiological evaluation and factors related to Anterolisthesis and retrolisthesis
Journal of Spinal Disorders & Techniques, 2002Co-Authors: Tetsuhiro Iguchi, Tomoaki Wakami, Akira Kurihara, Koichi Kasahara, Shinichi Yoshiya, Kotaro NishidaAbstract:Radiographs of 3,259 outpatients with low back disorders were examined for age, gender, level, direction, degree of slip, lumbar lordosis, pedicle-facet (P-F) angle, facet shape, and disc height. Degenerative lumbar spondylolisthesis was found in 284 (8.7%) of the patients, of which 83 were excluded. Single-level spondylolisthesis was present in 132 of the 201 patients studied, including 93 cases of Anterolisthesis and 39 of retrolisthesis, the former being predominant at L4 and in women and the latter at L2 and equal between the genders. Multilevel spondylolisthesis in 69 patients included 65 (94%) of two-segment slip, 21 anterior, 25 posterior, and 19 combined, and 4 cases of three-segment retrolisthesis. Factors related to Anterolisthesis were increased P-F angle and W-shaped facet joint; statistically, however, no factors were found statistically related to retrolisthesis. Multilevel Anterolisthesis was considered to occur from factors similar to those previously reported for single-level Anterolisthesis, and the pathomechanism of retrolisthesis is different from that of Anterolisthesis.
Takeshi Oichi - One of the best experts on this subject based on the ideXlab platform.
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cervical Anterolisthesis a predictor of poor neurological outcomes in cervical spondylotic myelopathy patients after cervical laminoplasty
Spine, 2016Co-Authors: Takeshi Oichi, Yasushi Oshima, Yuki Taniguchi, Yoshitaka Matsubayashi, Hirotaka Chikuda, Katsushi Takeshita, Sakae TanakaAbstract:STUDY DESIGN A retrospective cohort study. OBJECTIVE To clarify the influence of cervical spondylolisthesis on neurological outcomes in cervical spondylotic myelopathy (CSM) patients after cervical laminoplasty. SUMMARY OF BACKGROUND DATA Studies focusing on the surgical outcomes in CSM patients with cervical spondylolisthesis are limited. METHODS We retrospectively reviewed 125 CSM patients after cervical laminoplasty. Neurological outcomes were evaluated by calculating the Japanese Orthopedic Association (JOA) recovery rate at 2 years after surgery. We defined Anterolisthesis as a more than 3-mm anterior vertebral displacement in a flexion radiograph and retrolisthesis as a more than 3-mm posterior vertebral displacement in an extension radiograph. We further assessed potential risk factors for poor neurological outcomes after cervical laminoplasty, including cervical alignment, degree of spinal cord compression, duration of myelopathic symptoms, diabetes mellitus, and preoperative JOA score. Multivariate logistic regression analysis was performed to investigate the risk factors for poor outcomes (JOA recovery rate <50%) after cervical laminoplasty. RESULTS Our study included 86 men and 39 women with mean age of 64 (range, 30-89) years. Average JOA scores were 9.9 and 13.3 points before and at 2 years after surgery, respectively. Average recovery rate was 47.2% (range, -68% to 100%), with 62 patients having poor outcomes (JOA recovery rate <50%) at 2 years after surgery. Anterolisthesis and retrolisthesis were observed in 13 and 24 patients, respectively. Multivariate logistic regression analysis revealed that the Anterolisthesis was a significant risk factor for poor outcomes (JOA recovery rate <50%) after cervical laminoplasty (P = 0.01), whereas retrolisthesis did not affect the neurological outcomes (P = 0.6). CONCLUSION Anterolisthesis, but not retrolisthesis, is a significant risk factor for and predictor of poor neurological outcomes after cervical laminoplasty. Cervical laminoplasty should not be considered in CSM patients with Anterolisthesis. LEVEL OF EVIDENCE 2.
J Peluso - One of the best experts on this subject based on the ideXlab platform.
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hypoplasia of l5 and wedging and pseudospondylolisthesis in patients with spondylolysis study with mr imaging
American Journal of Neuroradiology, 2009Co-Authors: G Wilms, Baudouin Maldague, P Parizel, L Meylaerts, D Vanneste, J PelusoAbstract:BACKGROUND AND PURPOSE: The association between L5 hypoplasia and bilateral spondylolysis was described earlier on conventional radiographs of the lumbar spine. The purpose of this study was to describe the findings on MR imaging in patients with hypoplasia of L5 and to correlate these findings with the presence of bilateral spondylolysis of L5. MATERIAL AND METHODS: We studied the MR images of 22 patients with hypoplasia and posterior wedging of L5 and with bilateral spondylolysis at L5. The anteroposterior diameter of L4, L5, and S1 were measured and compared. The degree of posterior wedging of L5 was calculated. The degree of Anterolisthesis was determined. The intervertebral disks of L4-L5 and L5-S1 were studied. RESULTS: The mean difference between the anteroposterior diameter of L4 and L5 was 3.0 mm, or 8.8% shortening of L5 compared with L4. The mean difference between the anteroposterior diameter of L5 and S1 was 4.4 mm, or 12.3% shortening of L5 compared with S1. The mean percentage posterior wedging was 24.7%. In 13 patients, there was no anterior vertebral slipping. True Anterolisthesis grade I was seen in 5 patients and Anterolisthesis grade II in 4 patients. Diskarthrosis with disk dehydration of L4-L5 was seen in 20 of the 22 patients. CONCLUSIONS: It is confirmed that hypoplasia of L5 can simulate Anterolisthesis. Hypoplasia of the vertebral body of L5 can predict the presence of bilateral spondylolysis.
Yasushi Oshima - One of the best experts on this subject based on the ideXlab platform.
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cervical Anterolisthesis a predictor of poor neurological outcomes in cervical spondylotic myelopathy patients after cervical laminoplasty
Spine, 2016Co-Authors: Takeshi Oichi, Yasushi Oshima, Yuki Taniguchi, Yoshitaka Matsubayashi, Hirotaka Chikuda, Katsushi Takeshita, Sakae TanakaAbstract:STUDY DESIGN A retrospective cohort study. OBJECTIVE To clarify the influence of cervical spondylolisthesis on neurological outcomes in cervical spondylotic myelopathy (CSM) patients after cervical laminoplasty. SUMMARY OF BACKGROUND DATA Studies focusing on the surgical outcomes in CSM patients with cervical spondylolisthesis are limited. METHODS We retrospectively reviewed 125 CSM patients after cervical laminoplasty. Neurological outcomes were evaluated by calculating the Japanese Orthopedic Association (JOA) recovery rate at 2 years after surgery. We defined Anterolisthesis as a more than 3-mm anterior vertebral displacement in a flexion radiograph and retrolisthesis as a more than 3-mm posterior vertebral displacement in an extension radiograph. We further assessed potential risk factors for poor neurological outcomes after cervical laminoplasty, including cervical alignment, degree of spinal cord compression, duration of myelopathic symptoms, diabetes mellitus, and preoperative JOA score. Multivariate logistic regression analysis was performed to investigate the risk factors for poor outcomes (JOA recovery rate <50%) after cervical laminoplasty. RESULTS Our study included 86 men and 39 women with mean age of 64 (range, 30-89) years. Average JOA scores were 9.9 and 13.3 points before and at 2 years after surgery, respectively. Average recovery rate was 47.2% (range, -68% to 100%), with 62 patients having poor outcomes (JOA recovery rate <50%) at 2 years after surgery. Anterolisthesis and retrolisthesis were observed in 13 and 24 patients, respectively. Multivariate logistic regression analysis revealed that the Anterolisthesis was a significant risk factor for poor outcomes (JOA recovery rate <50%) after cervical laminoplasty (P = 0.01), whereas retrolisthesis did not affect the neurological outcomes (P = 0.6). CONCLUSION Anterolisthesis, but not retrolisthesis, is a significant risk factor for and predictor of poor neurological outcomes after cervical laminoplasty. Cervical laminoplasty should not be considered in CSM patients with Anterolisthesis. LEVEL OF EVIDENCE 2.