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Table 1 Patient demographics and clinical details

From: Comparative analysis of clinical factors associated with pedicle screw pull‐out during or immediately after surgery between intraoperative cone‐beam computed tomography and postoperative computed tomography

Variable N = 76
Patients with pedicle screw pullout 26 (34.2)
Age, years 69.2 ± 14.4
Sex
 Male 47 (61.8)
 Female 29 (38.2)
Body mass index 22.0 ± 3.4
Operating time, min 174.3 ± 85.7
Estimated blood loss, mL 225.3 ± 245.8
Disease
 Injury 55 (72.4)
 Metastasis 15 (19.7)
 Spondylitis 6 (7.9)
 Segments fused, n 4.8 ± 1.2
Surgical procedure
 PPS 57 (75.0)
 Open 19 (25.0)
Use of a hook system 6 (7.9)
Preoperative complications
 DISH 28 (36.8)
 Osteoporosis 33 (43.4)
 Rheumatoid arthritis 2 (2.6)
 Diabetes 16 (21.1)
 Asthma 6 (7.9)
 Requirement for dialysis 3 (3.9)
Smoking 12 (15.8)
Type of rod
 Titanium 60 (78.9)
 Cobalt chrome 16 (21.1)
Screw designs
 Mixed thread 15 (19.7)
 Dual thread 61 (80.3)
Degree of sagittal alignment between the UIV and LIV (kyphotic angle)
 Intraoperative CBCT, deg 6.2 ± 23.5
 Postoperative CT, deg 5.8 ± 23.5
Alignment change in the sagittal plane from CBCT to CT, deg 2.1 ± 1.5
Screw density, screws/level 1.69 ± 0.23
  1. Data are presented as mean ± standard deviation or as number (%). CBCT cone-beam computed tomography, CT computed tomography, DISH diffuse idiopathic skeletal hyperostosis, LIV lower instrumented vertebra, PPS percutaneous pedicle screw, UIV upper instrumented vertebra