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Table 2 Patient radiographic data

From: The effects of anterior vacuum disc on surgical outcomes of degenerative versus spondylolytic spondylolisthesis: at a minimum two-year follow-up

  Degenerative group (n = 22) Isthmic group (n = 20) p - value
Preoperative static view    
 Segmental angle, o 10.70 ± 5.42 9.63 ± 5.70 0.538
 Intradiscal angle, o 4.74 ± 5.51 1.92 ± 3.01 0.049
  Slippage, mm 6.85 ± 2.27 12.22 ± 5.15 < 0.001
  ADH, mm 7.46 ± 3.09 4.12 ± 2.42 < 0.001
  PDH, mm 5.16 ± 1.39 3.29 ± 1.85 0.001
Preoperative flexion view    
 Segmental angle, o 5.14 ± 6.72 10.53 ± 6.79 0.014
 Intradiscal angle, o 0.20 ± 6.38 1.09 ± 4.00 0.595
  Slippage, mm 9.08 ± 2.26 10.84 ± 5.54 0.177
Preoperative extension view    
 Segmental angle, o 14.89 ± 6.95 14.25 ± 5.60 0.350
 Intradiscal angle, o 7.12 ± 5.152 2.65 ± 2.11 0.005
  Slippage, mm 5.16 ± 2.72 10.11 ± 4.12 < 0.001
Postoperative static view    
 Segmental angle, o 12.61 ± 5.54 14.25 ± 5.60 0.350
 Intradiscal angle, o 6.11 ± 3.37 2.65 ± 2.11 < 0.001
  Slippage, mm 5.65 ± 1.86 8.73 ± 3.79 0.002
  ADH, mm 8.78 ± 2.29 4.62 ± 2.49 < 0.001
  PDH, mm 5.48 ± 1.54 3.40 ± 1.63 < 0.001
Final static view    
 Segmental angle, o 10.65 ± 5.27 12.43 ± 5.21 0.279
 Intradiscal angle, o 9.14 ± 6.64 2.51 ± 2.23 0.095
  Slippage, mm 6.97 ± 2.70 9.94 ± 4.15 0.008
  ADH, mm 7.37 ± 2.75 4.25 ± 1.75 < 0.001
  PDH, mm 4.62 ± 1.35 3.36 ± 1.60 0.009
Dynamic segmental angle change, o 9.74 ± 4.74 1.65 ± 5.29 < 0.001
Dynamic intradiscal angle change, o 6.92 ± 3.41 1.82 ± 4.46 < 0.001
Dynamic slippage change, mm 3.91 ± 1.53 0.73 ± 2.87 <0.001
Preoperative segmental kyphosis, n (%) 2 (9.1) 0 (0) 0.167
Preoperative intradiscal kyphosis, n (%) 3 (13.6) 2 (10) 0.716
Preoperative flexion segmental kyphosis, n (%) 5 (22.7) 1 (5) 0.101
Preoperative flexion intradiscal kyphosis, n (%) 11 (50) 5 (25) 0.096
Dynamic segmental lordotic change over 10°, n (%) 8 (36.6) 3 (15) 0.246
Dynamic intradiscal lordotic change over 10°, n (%) 3 (13.6) 0 (0) 0.230
Dynamic slippage change over 4 mm, n (%) 8 (36.4) 3 (15) 0.246
  1. Data are presented as mean ± SD unless noted otherwise. Dynamic segmental angle change = preoperative extension segmental angle – preoperative flexion segmental angle; dynamic intradiscal angle change = preoperative extension intradiscal angle – preoperative flexion intradiscal angle; dynamic slippage change = preoperative flexion slippage – preoperative extension slippage. Abbreviations: ADH anterior disc height, PDH posterior disc height.