title: Cortical bone trajectory screws for the middle-upper thorax: An anatomico-radiological study.
abstract: To quantify the reference data concerning the morphometrics of the middle-upper thorax to guide the placement of cortical bone trajectory (CBT) screws.Eighty patients were studied on computed tomography (CT) scans. The reference anatomical parameters were measured. Next, 20 cadaveric specimens were implanted with CBT screws based on CT measurements. These specimens were then judged directly from the cadaveric vertebrae and X-ray.The maximum length of the trajectory, the maximum diameter, and the cephaled angle exhibited a slight increase trend while the transverse and sagittal angles of the pedicle tended to decrease from T3 to T8. We recommend that the width of CBT screw for middle-upper thoracic spine is 5.0 mm, the length is 25 to 35 mm. The cadaveric anatomical study revealed that 5/240 screws penetrated in the medial or lateral areas, 5/240 screws penetrated in the superior or inferior pedicle wall, and 2/240 screws did not fit into the superior endplate of the pedicle.The CBT screws are safe for the middle-upper thorax. This study provides a theoretical basis for clinical surgery.
authors: Nan Fang Hospital of Southern Medical University, Guangzhou Department of Orthopedics Surgery, Second Affiliated Hospital of Wenzhou Medical University Department of Radiology, Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, China.
authors: Sun-Ren
authors: SR
authors: Sheng
authors: Jiao-Xiang
authors: JX
authors: Chen
authors: Wei
authors: W
authors: Chen
authors: En-Xing
authors: EX
authors: Xue
authors: Xiang-Yang
authors: XY
authors: Wang
authors: Qing-An
authors: QA
authors: Zhu
mesh_terms: D000328:Adult; D000368:Aged; D001863:Bone Screws; D002102:Cadaver; D000071538:Cortical Bone / Q000033:anatomy & histology* / Q000000981:diagnostic imaging / Q000601:surgery*; D005260:Female; D006801:Humans; D008159:Lumbar Vertebrae / Q000033:anatomy & histology* / Q000000981:diagnostic imaging / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D012016:Reference Values; D014057:Tomography, X-Ray Computed