Pressure distributions inside intervertebral discs under unilateral pedicle screw fixation in a porcine spine model
Autor: | Xuejun Zhang, Zhao Meng, Li-Jun Tian, Chen Wang, Dong Guo, Yan Zou |
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Jazyk: | angličtina |
Rok vydání: | 2018 |
Předmět: |
medicine.medical_specialty
lcsh:Diseases of the musculoskeletal system Porcine Swine Thoracic Vertebrae 03 medical and health sciences 0302 clinical medicine lcsh:Orthopedic surgery Pedicle Screws medicine Pressure Animals Orthopedics and Sports Medicine Pedicle screw fixation Pedicle screw Entire intervertebral disc Fixation (histology) 030222 orthopedics Lumbar Vertebrae business.industry Intervertebral disc Anatomy Unilateral Spine Internal Fixators Lateral bending Biomechanical Phenomena Compressive load lcsh:RD701-811 medicine.anatomical_structure Spinal Fusion Orthopedic surgery Models Animal Surgery Female lcsh:RC925-935 business 030217 neurology & neurosurgery Research Article |
Zdroj: | Journal of Orthopaedic Surgery and Research Journal of Orthopaedic Surgery and Research, Vol 13, Iss 1, Pp 1-7 (2018) |
ISSN: | 1749-799X |
Popis: | Background Little data are available regarding the effects of pedicle screws on the intervertebral disc stress for different spinal segments. The aim of this study was to analyze the intervertebral disc stress in response to the placement of pedicle screws. Methods T3–4, T11–12, T15–L1, L3–4, and L4–5 intervertebral disc segments from six porcine spine specimens were harvested. A compressive load of 200 N was applied both before and after the pedicle screw was implanted on the left side of each target segment; the resulting pressure was measured during vertical, 5° anterior flexion, 5° posterior extension, and 5° lateral bending. Results The posterior intradiscal pressures of the intervertebral disc were significantly lower in the fixed group than in the unfixed group for all segments during vertical, 5° anterior flexion, and 5° posterior extension. The left pressures of the intervertebral disc were significantly lower in the fixation group for all segments. During 5° lateral bending, the left intervertebral disc pressures were significantly lower in the fixation group. Lower mean pressures were observed in the fixed group. Conclusions Unilateral pedicle screws can effectively reduce the pressure of the fixed lateral intervertebral disc. Moreover, it can change the pressure distribution of the intervertebral disc and reduce the pressure of the entire intervertebral disc, especially the posterior side of the intervertebral disc. |
Databáze: | OpenAIRE |
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