Fig. 4From: Pedicle screw loosening: the value of radiological imagings and the identification of risk factors assessed by extraction torque during screw removal surgeryScatter diagram of patients’ average torques and BMD. The results showed a low but significant linear correlation between extraction torque and BMD. p = 0.01, R2 = 0.267, F = 8.296, Linear regression analysisBack to article page