Bunmaprasert Torphong, Roobsoong Amomsak, Pongmanee Suthipas, Khunsree Songsak, Laowatthanaphong Sikrai
J Med Assoc Thai. 2014 Dec;97(12):1344-51.
Understanding of the pedicle anatomy is necessary for pedicle screw placement; however, there have been few Thai studies reporting on thoracic pedicle morphometry.
To determine important anatomical measurements for thoracic pedicle screw fixation.
T1-T12 vertebral pedicles were evaluated in 27 cadavers. The diameter angle, length and entry point of the pedicle were measured.
The transverse diameter was smaller than the sagittal diameter at all levels. The narrowest transverse diameter was at the T5 level in males and T4 level in females. The pedicle diameter in males was statistically significantly greater than in females at all levels except at the T12 level. Most pedicles with a transverse diameter of 5.0 mm or less were found at the T4, T5, T6 and T7 levels. The transverse angle was widest at the T1 level; it faced medially at all levels. The sagittal angle was widest at the T12 level andfaced cephaladly at all levels. The axis length was shortest at the T1 level. Most entry points were at the inferolateral zone.
A 4-mm diameter screw should be used carefully at the mid-thoracic levels for Thai people, especially females. Screw lengths of less than 30 mm are safe for placement at all levels. The safe zone for the pedicle entry point is in the inferolateral zone.
了解椎弓根解剖结构对于椎弓根螺钉置入至关重要；然而，泰国关于胸椎椎弓根形态测量的研究较少。
确定胸椎椎弓根螺钉固定的重要解剖学测量值。
对27具尸体的T1 - T12椎体椎弓根进行评估。测量椎弓根的直径、角度、长度和进针点。
各节段横径均小于矢状径。男性横径最窄处为T5节段，女性为T4节段。除T12节段外，各节段男性椎弓根直径均显著大于女性。横径5.0 mm及以下的椎弓根多见于T4、T5、T6和T7节段。横角在T1节段最宽，各节段均向内。矢状角在T12节段最宽，各节段均向上。轴长在T1节段最短。大多数进针点位于下外侧区。
对于泰国人，尤其是女性，在胸椎中段使用直径4 mm的螺钉时应谨慎。各节段置入长度小于30 mm的螺钉是安全的。椎弓根进针点的安全区域在下外侧区。
