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Thoracic and lumbar spine pedicle morphology in Japanese patients

森田 康平 東京慈恵会医科大学 DOI:info:doi/10.1007/s00276-021-02707-8

2022.07.04

概要

Purpose
Pedicle morphology is important for intraoperative surgical anatomy and to define pedicle screw design and parameters. However, differences of pedicle size according to ethnicityand gender are not well studied. The purpose of this study is to investigate morphological characteristics of the pedicle in Japanese patients for determining adequate screw size and optimal surgical planning.

Methods
We investigated thoracic and lumbar pedicle morphology in Japanese patients using computed tomography (CT) measurements andanalyzed the standard size of pedicles on upper thoracic to lumbar spine CT images in 227 Japanese patients.

Results
Gender had a larger impact on the shape and size of pediclesthan racial differences.In the distribution of pedicle width, we calculated the ratio of values less than 4.5 mm, that in females resulted to be over 30% for the Th3 ~ Th9 segment, and particularly high, above60% at Th4 and Th5.

Conclusion
Our measurement analysis showed that pedicle morphological parameters in Japanese patients showed tendency to be smaller to those found in other studies, and particularly in female patients, they were statistically significantly smaller. Adequate trans-pedicular instrumentation for Japanese patients will require smaller size pedicle related devices that will match our anatomical findings to achieve safe device placement.In addition, serving ethnically non-homogenous patient population can require further to spinal morphometric for precise device selection.

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