Geometry of thoracolumbar vertebral endplates of the human spine |
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Authors: | Hong Chen Dianming Jiang Yunsheng Ou Jian Zhong Fajin Lv |
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Institution: | (1) Department of Orthopedics, First Affiliated Hospital of Chongqing Medical University, 1, Youyi Road, Yuanjiagang Yuzhong District, Chongqing, 400016, China;(2) Department of Radiology, First Affiliated Hospital, Chongqing Medical University, Chongqing, China; |
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Abstract: | Novel and better vertebral body replacement constructs are always desired by surgeons. Endplate geometry is crucial for the
design of those implants, but current literature on that topic is very scarce. The authors present a morphometric study of
thoracolumbar vertebral endplates, the goal of which was to analyze the geometry of endplates from T10 inferior to L3 superior
by employing data from CT scans, as well as to verify the reliability of data derived from the CT measurement. Reformatted
CT scans of 83 individuals were analyzed and sagittal concave angle, location of concave region, sagittal diameter of endplate,
coronal concave angle, as well as transverse diameter of endplate were measured in midsagittal plane and specified coronal
plane. The data of CT and cadaveric measurements of ten cadaveric specimens were also compared. Age and gender did not influence
sagittal concave angle, location of concave region, and coronal concave angle significantly (P > 0.05). No significant difference has been revealed among each endplate for sagittal concave angle (range 162.5°–163.9°)
and location of concave region (range 42.5–44.2%), either. Ranging between 170.9° and 175.7°, coronal concave angle was constantly
larger in superior endplate than in inferior one. The sagittal and transverse endplate diameters of females were significantly
smaller than those of males (P < 0.05), being about 88% of the latter one. The mean difference between CT and cadaveric measurements was small (Cronbach
alpha > 0.8). Those morphologic parameters, especially the concavity of endplates, should be taken into consideration when
designing novel vertebral body replacement constructs. CT measurement data could be used to calculate most suitable geometric
parameters of those implants. |
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