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Table 3 Fourfold data of X-ray criteria indicated X-ray had a sensitivity of 24% and a specificity of 98%

From: Pedicle screw loosening: the value of radiological imagings and the identification of risk factors assessed by extraction torque during screw removal surgery

X-ray

Loose

Not loose

p value

Positive

17 (24%)

3 (2%)

< 0.001a

Negative

53 (76%)

153 (98%)

 
  1. Positive—radiolucent area (thicker than 1 mm) and/or the double halo around the screw
  2. aChi-square test
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Journal of Orthopaedic Surgery and Research

ISSN: 1749-799X