A Biomechanial Study And Clinical Application Of Transpedicular Fixation Into The Injured Vertebra For Thoracolumbar Fractures

Objective: To evaluate biomechanism and clinical application on the pedical screws fixed into the injured vertebra for thoracolumbar fractures. Method: 5 fresh calf thoracolumbar spinal fracture(T₁₂-L₆) were made to compare the stability of three kind of ways for transpedicular fixation by its axial compression, bending, rotation and axial extraction force of the long and short pedical screw. To explore the stability of spine in fracture thoracolumbar vertebra fixed with pedical screws. There were 11 cases used the technique of fixation with pedical screws in fracture thoracolumbar vertebra. Results: All of the three kind ways for transpedical fixation(fixed with 4,6 or 8 pedical screws) can restore the stability of injured thoracolumbar vertebra in axial compression, bending, rotation. No statistical difference of spine stability capacity was found between 6 pedical screws fixation and 8 pedical screws fixation(P>0.05), but both of them had statistical difference of spine stability capacity compare with 4 pedical screws fixation(P<0.05). Clinical result showed that transpedicular fixation in fracture vertebra can keep the stability of spine, reduce the lost of spinal height of the injured vertebra after operation. Conclusion: Biomechanial study prove that transpedicalar fixation into the injured vertebra can enhance the stability of spine. Clinical application shows that transpedicular fixation into fracture vertebra is practical, effective and useful for treatment of the fracture in thoracic or lumbar spine. So it is worthy of clinical applications.