The Correlation Analysis Between the Pedicle Screw Placement Palpation and Torque.

Area of Science:

• Orthopedic Surgery
• Spinal Fusion
• Biomechanical Engineering

Background:

• Pedicle screw torque is crucial in spinal internal fixation.
• Factors influencing intraoperative torque and its relation to tactile feedback require investigation.

Purpose of the Study:

• To identify factors affecting pedicle screw torque.
• To examine the correlation between manual palpation and screw torque.

Main Methods:

• Prospective study of 51 patients undergoing spinal internal fixation.
• Collected data on surgeon's tactile perception, manual palpation scores, and peak screw torque.
• Analyzed demographic variables and bone mineral density (BMD).

Main Results:

• Lumbar BMD was an independent factor influencing pedicle screw torque.
• Positive correlation found between manual palpation scores and torque values.
• Lower torque and tactile scores observed in one patient group.

Conclusions:

• Lumbar BMD is a key determinant of pedicle screw torque.
• Intraoperative tactile sensation strongly correlates with measured torque.
• Recommendations provided for bone cement reinforcement based on tactile score and torque.