NGHIÊN CỨU ĐẶC ĐIỂM GIẢI PHẪU CUỐNG CUNG CỘT SỐNG NGỰC TRÊN HÌNH ẢNH CẮT LỚP VI TÍNH TẠI BỆNH VIỆN HỮU NGHỊ VIỆT ĐỨC

Abstract

Objective: This study aims to describe in detail the anatomical characteristics of the thoracic pedicle in adult Vietnamese individuals, evaluate its applicability in proposing appropriate screw sizes for pedicle screw fixation techniques. Methods: A cross-sectional descriptive study utilizing retrospective data was conducted on 155 adult subjects, with data collected from 3620 thoracic pedicles. The measured anatomical parameters included outer pedicle width (OPW), outer pedicle height (OPH), cortical thickness (SCT, ICT, MCT, LCT), pedicle length (PL), chord length (CL), sagittal pedicle angle (SPA), and transverse pedicle angle (TPA). Results: The male-to-female ratio was 2:1, with an average age of 31,26 ± 5,96 years. OPW decreased from T1 to T4, then increased progressively to T12, males had larger OPW than females. OPH increased from T1 to T12 and was also larger in males. Inner cortical thickness was greater than outer cortical thickness, with no significant gender difference. CL varied across vertebral levels, with CL being shorter in females. SPA increased from T1 to T6 and then decreased to T12, while TPA gradually decreased from T1 to T12. Conclusion: This study provides detailed anatomical data on thoracic pedicles in adult Vietnamese individuals, highlighting significant differences from European populations and similarities with certain Asian populations. We propose that the safe pedicle screw length for the thoracic spine ranges from 25 - 30 mm for T1 to T4, 30 - 35 mm for T5 – T12; a screw diameter of 3.5 mm at T4–T5, 4.0–4.5 mm for other levels, and ≥5.0 mm for T1, T11, and T12.