A study of screw placement to obtain the optimal pull-out resistance of lumbar pedicle screws—analysis of Hounsfield units measurements based on computed tomography

Autor: Dachuan Li, Chi Sun, Jianyuan Jiang, Feizhou Lu, Xinlei Xia, Hongli Wang, Fei Zou, Xiaosheng Ma
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: BMC Musculoskeletal Disorders, Vol 23, Iss 1, Pp 1-11 (2022)
Druh dokumentu: article
ISSN: 1471-2474
DOI: 10.1186/s12891-022-05074-6
Popis: Abstract Objective The screw path of lumbar pedicle screws in the vertebral body has certain variability. It is not clear whether the screw paths in different directions can obtain the same pull-out resistance. This study intends to use CT (Computed Tomography) to measure the Hounsfield unit (HU value) around the screw paths in different parts of the lumbar vertebral body to obtain the bone mineral density value of the corresponding parts which will provide some reference for the direction of lumbar pedicle screw placement. Methods This retrospective study included 200 patients with lumbar degenerative diseases selected randomly from the case base and the patient’s basic information was recorded. L1-L5 vertebral body was divided equally into the upper, middle and lower 1/3, which was consistent with the three sagittal entry directions of the pedicle screw head tilt, parallel endplate and caudal tilt, and the HU values were measured by CT cross-sectional scanning to indirectly reflect the local bone density values. The paired t-test (randomized block experiment) was used to compare the HU values of the upper, middle and lower 1 / 3 parts, with P
Databáze: Directory of Open Access Journals
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