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Table 2 Comparisons of morphological parameters between the two groups

From: Morphological analysis for subaxial cervical pedicle screw insertion in developmental and non-developmental canal stenosis

Level Group POW(mm) TCP(number) PTA(°) RSA(°)
Male Female Total Male Female Total Male Female Total Male Female Total
C3 DCS 5.7 ± 0.6 4.8 ± 0.8 5.3 ± 0.7 2 5 7 (11.6%) 43.7 ± 3.4 44.4 ± 3.6 43.9 ± 3.5 10.1 ± 3.7 8.9 ± 2.8 9.3 ± 3.3
NDCS 4.7 ± 0.8 3.7 ± 1.6 4.1 ± 0.9* 8 13 21 (35.0%)# 44.5 ± 3.2 46.1 ± 3.5 45.5 ± 3.4 9.3 ± 3.6 8.2 ± 2.8 8.7 ± 3.2
C4 DCS 5.8 ± 0.6 5.0 ± 0.7 5.5 ± 0.8 3 5 8(13.3%) 47.2 ± 3.4 48.2 ± 3.4 47.6 ± 3.4 11.9 ± 3.5 10.7 ± 4.6 11.3 ± 3.8
NDCS 4.9 ± 1.1 4.0 ± 0.7 4.4 ± 0.8* 5 12 17(28.3%)# 47.2 ± 2.8 46.7 ± 3.6 46.9 ± 3.4 11.2 ± 2.6 9.8 ± 3.7 10.5 ± 3.2*
C5 DCS 6.0 ± 0.7 5.4 ± 0.6 5.8 ± 0.7 1 4 5(8.3%) 45.3 ± 4.3 45.6 ± 4.2 45.4 ± 4.3 13.1 ± 3.4 11.6 ± 2.7 12.3 ± 3.8
NDCS 5.1 ± 1.0 4.4 ± 0.7 4.7 ± 0.9* 3 10 13(21.7%)# 47.1 ± 3.0 44.8 ± 4.0 45.7 ± 3.8 11.2 ± 3.6 10.3 ± 4.9 10.8 ± 4.2*
C6 DCS 6.5 ± 0.9 5.8 ± 0.6 6.2 ± 0.7 1 4 5(8.3%) 38.9 ± 4.4 41.7 ± 4.8 40.0 ± 4.7 13.5 ± 3.0 12.3 ± 3.8 12.9 ± 3.4
NDCS 5.7 ± 1.1 4.7 ± 0.7 5.1 ± 0.9* 3 6 9(15.0%) 41.3 ± 4.5 42.6 ± 5.3 42.3 ± 4.2 11.8 ± 4.1 10.2 ± 4.6 11.0 ± 4.4*
C7 DCS 7.6 ± 0.4 6.5 ± 1.5 7.0 ± 0.8 None None None 33.4 ± 3.7 34.5 ± 4.8 33.8 ± 4.2 14.5 ± 3.2 12.6 ± 4.7 13.2 ± 3.9
NDCS 6.7 ± 1.6 5.6 ± 0.7 6.1 ± 0.7* None None None 35.1 ± 5.3 36.2 ± 3.7 35.9 ± 4.6 13.0 ± 3.1 11.7 ± 4.2 12.2 ± 3.9*
  1. POW Pedicle outer width, TCP Tiny cervical pedicle (POW less than 4 mm), PTA Pedicle transverse angle, RSA Range of safe angle
  2. * Independent Samples T Test, P < 0.05
  3. # Pearson’s Chi Square Test, P < 0.05