The Experts below are selected from a list of 888 Experts worldwide ranked by ideXlab platform
Chenjun Liu - One of the best experts on this subject based on the ideXlab platform.
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biomechanical effect of bone resorption of the spinous process after single segment interspinous Dynamic Stabilization Device implantation a finite element analysis
Medicine, 2018Co-Authors: Zhenqi Zhu, Shuo Duan, Kaifeng Wang, Haiying Liu, Chenjun LiuAbstract:This study aims to explore the influence of bone resorption of the spinous process after single-segment interspinous process Device (IPD) implantation on the biomechanics of the lumbar spine.The 3D finite element model of the lumbar spine (L3-L5) was modified, and 2 models that simulated the presence and absence of bone resorption of the spinous process were developed using an IPD (Wallis). Its biomechanical effects, such as change in range of motion (ROM) and intervertebral disc and facet stress, were introduced at operative (L4/5) and adjacent (L3/4) levels.Compared with the INT model, the Wallis model and Wallis-BR model had similar ROMs in lateral flexion and rotation. However, the Wallis model had a lower L3-5 ROM in flexion (20.4% lower) and extension (26.4% lower), and L4-L5 ROM in flexion (74.1% lower) and extension (70.8% lower), while the overall ROM of the Wallis-BR model was greater than that of the Wallis model. The stress on the L3/L4 intervertebral disc and facets was similar for all 3 models. Compared with the INT model and Wallis-BR model, the stress on the L4/L5 intervertebral disc and facets under all movements significantly decreased in the Wallis model. The stress on the L5 process was greater than that on the L4 process in both the Wallis model and Wallis-BR model, and the load on the processes that underwent bone resorption was lower than that of the Wallis model.The function of the IPD slowly decreased with the occurrence of bone resorption of the interspinous process. This bone remodeling may be associated with high stress after IPD implantation.
Zhenqi Zhu - One of the best experts on this subject based on the ideXlab platform.
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biomechanical effect of bone resorption of the spinous process after single segment interspinous Dynamic Stabilization Device implantation a finite element analysis
Medicine, 2018Co-Authors: Zhenqi Zhu, Shuo Duan, Kaifeng Wang, Haiying Liu, Chenjun LiuAbstract:This study aims to explore the influence of bone resorption of the spinous process after single-segment interspinous process Device (IPD) implantation on the biomechanics of the lumbar spine.The 3D finite element model of the lumbar spine (L3-L5) was modified, and 2 models that simulated the presence and absence of bone resorption of the spinous process were developed using an IPD (Wallis). Its biomechanical effects, such as change in range of motion (ROM) and intervertebral disc and facet stress, were introduced at operative (L4/5) and adjacent (L3/4) levels.Compared with the INT model, the Wallis model and Wallis-BR model had similar ROMs in lateral flexion and rotation. However, the Wallis model had a lower L3-5 ROM in flexion (20.4% lower) and extension (26.4% lower), and L4-L5 ROM in flexion (74.1% lower) and extension (70.8% lower), while the overall ROM of the Wallis-BR model was greater than that of the Wallis model. The stress on the L3/L4 intervertebral disc and facets was similar for all 3 models. Compared with the INT model and Wallis-BR model, the stress on the L4/L5 intervertebral disc and facets under all movements significantly decreased in the Wallis model. The stress on the L5 process was greater than that on the L4 process in both the Wallis model and Wallis-BR model, and the load on the processes that underwent bone resorption was lower than that of the Wallis model.The function of the IPD slowly decreased with the occurrence of bone resorption of the interspinous process. This bone remodeling may be associated with high stress after IPD implantation.
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bone resorption during the first year after implantation of a single segment Dynamic interspinous Stabilization Device and its risk factors
BMC Musculoskeletal Disorders, 2015Co-Authors: Kaifeng Wang, Zhenqi Zhu, Bo Wang, Yi Zhu, Haiying LiuAbstract:Dynamic interspinous Stabilization Devices generally provide satisfactory results, but can result in recurrent lumbar disc herniation, spinous process fracture, or bone resorption of the spinous process. The purpose of this study was to investigate if the Wallis Dynamic Stabilization Device is associated with bone resorption. Patients who underwent single-segment posterior lumbar decompression and implantation of a Wallis Dynamic interspinous Stabilization Device at the L4/5 level between January 1, 2009 and October 1, 2011 were included. Bone resorption rate, Oswestry Disability Index (ODI), Japanese Orthopedic Association (JOA) score, and visual analogue scale (VAS) pain score were measured. Patient baseline and 1-year follow-up data were collected and analyzed. The bone resorption rate of the L4 and L5 spinous processes was calculated. Twenty four males and 20 females with a mean age of 42.7 ± 14.7 years were included. Twenty nine patients had significant bone resorption (bone resorption rate > 20%) and 15 had no bone resorption (bone resorption rate ≤ 20%) at 1 year after surgery. Lumbar lordosis ≥ 50° was associated with a lower bone resorption than lumbar lordosis < 50° and increasing BMI was associated with increased bone resorption. There were no significant differences between the bone resorption and no bone resorption groups in the improvement rate of VAS pain score, ODI, and JOA score at 1 year after surgery. Significant bone resorption occurs within 1 year after implantation of the Wallis Device in more than 50% of patients. However, it does not affect short-term functional results.
Haiying Liu - One of the best experts on this subject based on the ideXlab platform.
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biomechanical effect of bone resorption of the spinous process after single segment interspinous Dynamic Stabilization Device implantation a finite element analysis
Medicine, 2018Co-Authors: Zhenqi Zhu, Shuo Duan, Kaifeng Wang, Haiying Liu, Chenjun LiuAbstract:This study aims to explore the influence of bone resorption of the spinous process after single-segment interspinous process Device (IPD) implantation on the biomechanics of the lumbar spine.The 3D finite element model of the lumbar spine (L3-L5) was modified, and 2 models that simulated the presence and absence of bone resorption of the spinous process were developed using an IPD (Wallis). Its biomechanical effects, such as change in range of motion (ROM) and intervertebral disc and facet stress, were introduced at operative (L4/5) and adjacent (L3/4) levels.Compared with the INT model, the Wallis model and Wallis-BR model had similar ROMs in lateral flexion and rotation. However, the Wallis model had a lower L3-5 ROM in flexion (20.4% lower) and extension (26.4% lower), and L4-L5 ROM in flexion (74.1% lower) and extension (70.8% lower), while the overall ROM of the Wallis-BR model was greater than that of the Wallis model. The stress on the L3/L4 intervertebral disc and facets was similar for all 3 models. Compared with the INT model and Wallis-BR model, the stress on the L4/L5 intervertebral disc and facets under all movements significantly decreased in the Wallis model. The stress on the L5 process was greater than that on the L4 process in both the Wallis model and Wallis-BR model, and the load on the processes that underwent bone resorption was lower than that of the Wallis model.The function of the IPD slowly decreased with the occurrence of bone resorption of the interspinous process. This bone remodeling may be associated with high stress after IPD implantation.
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bone resorption during the first year after implantation of a single segment Dynamic interspinous Stabilization Device and its risk factors
BMC Musculoskeletal Disorders, 2015Co-Authors: Kaifeng Wang, Zhenqi Zhu, Bo Wang, Yi Zhu, Haiying LiuAbstract:Dynamic interspinous Stabilization Devices generally provide satisfactory results, but can result in recurrent lumbar disc herniation, spinous process fracture, or bone resorption of the spinous process. The purpose of this study was to investigate if the Wallis Dynamic Stabilization Device is associated with bone resorption. Patients who underwent single-segment posterior lumbar decompression and implantation of a Wallis Dynamic interspinous Stabilization Device at the L4/5 level between January 1, 2009 and October 1, 2011 were included. Bone resorption rate, Oswestry Disability Index (ODI), Japanese Orthopedic Association (JOA) score, and visual analogue scale (VAS) pain score were measured. Patient baseline and 1-year follow-up data were collected and analyzed. The bone resorption rate of the L4 and L5 spinous processes was calculated. Twenty four males and 20 females with a mean age of 42.7 ± 14.7 years were included. Twenty nine patients had significant bone resorption (bone resorption rate > 20%) and 15 had no bone resorption (bone resorption rate ≤ 20%) at 1 year after surgery. Lumbar lordosis ≥ 50° was associated with a lower bone resorption than lumbar lordosis < 50° and increasing BMI was associated with increased bone resorption. There were no significant differences between the bone resorption and no bone resorption groups in the improvement rate of VAS pain score, ODI, and JOA score at 1 year after surgery. Significant bone resorption occurs within 1 year after implantation of the Wallis Device in more than 50% of patients. However, it does not affect short-term functional results.
Kaifeng Wang - One of the best experts on this subject based on the ideXlab platform.
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biomechanical effect of bone resorption of the spinous process after single segment interspinous Dynamic Stabilization Device implantation a finite element analysis
Medicine, 2018Co-Authors: Zhenqi Zhu, Shuo Duan, Kaifeng Wang, Haiying Liu, Chenjun LiuAbstract:This study aims to explore the influence of bone resorption of the spinous process after single-segment interspinous process Device (IPD) implantation on the biomechanics of the lumbar spine.The 3D finite element model of the lumbar spine (L3-L5) was modified, and 2 models that simulated the presence and absence of bone resorption of the spinous process were developed using an IPD (Wallis). Its biomechanical effects, such as change in range of motion (ROM) and intervertebral disc and facet stress, were introduced at operative (L4/5) and adjacent (L3/4) levels.Compared with the INT model, the Wallis model and Wallis-BR model had similar ROMs in lateral flexion and rotation. However, the Wallis model had a lower L3-5 ROM in flexion (20.4% lower) and extension (26.4% lower), and L4-L5 ROM in flexion (74.1% lower) and extension (70.8% lower), while the overall ROM of the Wallis-BR model was greater than that of the Wallis model. The stress on the L3/L4 intervertebral disc and facets was similar for all 3 models. Compared with the INT model and Wallis-BR model, the stress on the L4/L5 intervertebral disc and facets under all movements significantly decreased in the Wallis model. The stress on the L5 process was greater than that on the L4 process in both the Wallis model and Wallis-BR model, and the load on the processes that underwent bone resorption was lower than that of the Wallis model.The function of the IPD slowly decreased with the occurrence of bone resorption of the interspinous process. This bone remodeling may be associated with high stress after IPD implantation.
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bone resorption during the first year after implantation of a single segment Dynamic interspinous Stabilization Device and its risk factors
BMC Musculoskeletal Disorders, 2015Co-Authors: Kaifeng Wang, Zhenqi Zhu, Bo Wang, Yi Zhu, Haiying LiuAbstract:Dynamic interspinous Stabilization Devices generally provide satisfactory results, but can result in recurrent lumbar disc herniation, spinous process fracture, or bone resorption of the spinous process. The purpose of this study was to investigate if the Wallis Dynamic Stabilization Device is associated with bone resorption. Patients who underwent single-segment posterior lumbar decompression and implantation of a Wallis Dynamic interspinous Stabilization Device at the L4/5 level between January 1, 2009 and October 1, 2011 were included. Bone resorption rate, Oswestry Disability Index (ODI), Japanese Orthopedic Association (JOA) score, and visual analogue scale (VAS) pain score were measured. Patient baseline and 1-year follow-up data were collected and analyzed. The bone resorption rate of the L4 and L5 spinous processes was calculated. Twenty four males and 20 females with a mean age of 42.7 ± 14.7 years were included. Twenty nine patients had significant bone resorption (bone resorption rate > 20%) and 15 had no bone resorption (bone resorption rate ≤ 20%) at 1 year after surgery. Lumbar lordosis ≥ 50° was associated with a lower bone resorption than lumbar lordosis < 50° and increasing BMI was associated with increased bone resorption. There were no significant differences between the bone resorption and no bone resorption groups in the improvement rate of VAS pain score, ODI, and JOA score at 1 year after surgery. Significant bone resorption occurs within 1 year after implantation of the Wallis Device in more than 50% of patients. However, it does not affect short-term functional results.
Paolo Mangione - One of the best experts on this subject based on the ideXlab platform.
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Clinical evaluation of a lumbar interspinous Dynamic Stabilization Device (the Wallis system) with a 13-year mean follow-up
Neurosurgical Review, 2009Co-Authors: Jacques Sénégas, Jean-marc Vital, Vincent Pointillart, Paolo MangioneAbstract:The authors determined current health status of patients who had been included in a long-term survivorship analysis of a lumbar Dynamic stabilizer. Among 133 living patients, 107 (average age at surgery, 44.2 ± 9.9 years) completed health questionnaires. All patients had initially been scheduled for decompression and fusion for canal stenosis, herniated disc, or both. In 20 patients, the implant was removed, and fusion was performed. The other 87 still had the Dynamic stabilizer. Satisfaction, Oswestry disability index, visual analog scales for back and leg pain, short-form (SF-36) quality-of-life physical composite score, physical function, and social function were significantly better ( p ≤ 0.05) in the patients who still had the Dynamic Stabilization Device. SF-36 scores of the fused subgroup were no worse than those reported elsewhere in patients who had primary pedicle-screw enhanced lumbar fusion. This anatomy-sparing Device provided a good 13-year clinical outcome and obviated arthrodesis in 80% of patients.
