Applied anatomy study of inner vertebral canal venous plexus of thoracolumbar

【Objective】To investigate the anatomic characteristics of the thoracolumbar segment inner vertebral canal venous plexus for reducing bleeding in the process of bone grafting in injured vertebral body through vertebral canal for thoracolumbar fracture operation and provide the anatomical basis. 【Methods】The 18 adult embalmed corpse specimen of thoracolumbar section were collected and their venous plexus distribution characteristics which located at pedicle medial were observed. 【Results】The anterior inner vertebral venous plexus gradually increased from top to bottom between the most prominent of pedicle medial and posterior longitudinal ligament, whose width ranged from(3.28±0.43) mm to(4.46±0.23) mm. The transverse branches height of anterior inner vertebral venous plexus gradually increased from top to bottom too, which located under posterior longitudinal ligament and width ranged from(10.23±0.26) mm to(17.22±0.28) mm. Before anterior inner vertebral venous plexus and transverse transverse branch ventral was the nourish pores, located in vertebral posterior wall in the middle. more on the Midline more intensive, aperture is wide. There was posterior sinus of posterior inner vertebral venous plexus around the junction of pedicle medial and lamina, between(1.45±0.23) mm and(1.73±0.38) mm in diameter.【Conclusions】There are anterior inner vertebral venous plexus, transverse branch and posterior sinus at the pedicle medial of thoracolumbar vertebra canal. In this range, according to each position of venous plexus and anatomical features for targeted operation can reduce the damage venous plexus inner vertebral canal and intra operative hemorrhage.