Author/Authors :
Huang, Yi-Jiang Third Affiliated Hospital of Wenzhou Medical College - Department of Orthopaedics, China , Peng, Mao-Xiu Third Affiliated Hospital of Wenzhou Medical College - Department of Orthopaedics, China , He, Shao-Qi Third Affiliated Hospital of Wenzhou Medical College - Department of Orthopaedics, China , Liu, Liang-Le Third Affiliated Hospital of Wenzhou Medical College - Department of Orthopaedics, China , Dai, Ming-Hai Third Affiliated Hospital of Wenzhou Medical College - Department of Orthopaedics, China , Tang, Chenxuan Third Affiliated Hospital of Wenzhou Medical College - Department of Orthopaedics, China , huang, y.-j. department of orthopaedics,the third affiliated hospital of wenzhou medical college,wenzhou, China , peng, m.-x. department of orthopaedics,the third affiliated hospital of wenzhou medical college,wenzhou, China , he, s.-q. department of orthopaedics,the third affiliated hospital of wenzhou medical college,wenzhou, China , liu, l.-l. department of orthopaedics,the third affiliated hospital of wenzhou medical college,wenzhou, China , dai, m.-h. department of orthopaedics,the third affiliated hospital of wenzhou medical college,wenzhou, China , tang, c. department of orthopaedics,the third affiliated hospital of wenzhou medical college,wenzhou, China
Abstract :
Background: Funnel technique is a method used for the insertion of screw into thoracic pedicle.Aim: To evaluate the biomechanical characteristics of thoracic pedicle screw placement using the Funnel technique, trying to provide biomechanical basis for clinical application of this technology.Methods: 14 functional spinal units (T6 to T10) were selected from thoracic spine specimens of 14 fresh adult cadavers, and randomly divided into two groups, including Funnel technique group (n=7) and Magerl technique group (n=7). The displacement-stiffness and pull-out strength in all kinds of position were tested and compared. Results: Two fixed groups were significantly higher than that of the intact state (P 0.05) in the spinal central axial direction, compression, anterior flexion, posterior bending, lateral bending, axial torsion, but there were no significant differences between two fixed groups (P 0.05). The mean pull-out strength in Funnel technique group (789.09±27.33) was lower than that in Magerl technique group (P 0.05). Conclusions: The Funnel technique for the insertion point of posterior bone is a safe and accurate technique for pedicle screw placement. It exhibited no effects on the stiffness of spinal column, but decreased the pull-out strength of pedicle screw. Therefore, the funnel technique in the thoracic spine affords an alternative for the standard screw placement.
