Torque from Length Dependence Analysis of Pedicle Screw Insertion under Spinal Fusion Procedure with Multifunctional Wireless Device

The main stage of the operation for transpedicular fixation of the spine is the insertion of a pedicular screw into the vertebral body. The main parameters of the neurosurgical process are the value of the torque and the length of the pathway of the screw entry into the vertebral body. Evaluation of these parameters is possible when using a multifunctional wireless device that includes a force-moment and inertial sensors. The data on the torque and angular path are processed according to an algorithm that allows determining the dependence of the torque on the length of the pathway of the pedicular screw into the vertebra. Analyzing the determined dependence during statistical experiments, it becomes possible to find additional parameters of the neurosurgical manipulation. These parameters can be criteria for the quality of neurosurgical manipulation performed or used to assess the strength properties of material. In this paper, a data processing algorithm is given to obtain the dependence of the torque on the length of the pathway of approach of the pedicular screw. The criteria for determining the process of neurosurgical manipulation for the insertion of a pedicular screw are presented, described on the basis of the obtained dependence of the torque on the length of the pathway of the screw.