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Table 3 Radiographic analysis between migrated and non-migrated cages in the PCM group

From: Cage positioning as a risk factor for posterior cage migration following transforaminal lumbar interbody fusion – an analysis of 953 cases

  Migrated (n = 24) Non-migrated (n = 24) P-value
Cage position
 Depth ratio −0.119 ± 0.063 0.022 ± 0.087 < 0.001
 Coronal ratio −0.080 ± 0.062 −0.086 ± 0.072 0.978
Preoperative disc radiographic parameter
 DH (mm) 11.43 ± 2.03 8.82 ± 2.53 < 0.001
 ROM (°) 8.40 ± 5.38 6.73 ± 4.48 0.249
 Translation (mm) 3.34 ± 2.45 3.19 ± 2.89 0.845
 Slippage (%) 10.60 ± 10.54 11.23 ± 9.47 0.828
Cage size & geometry
 Cage height (mm) 11.17 ± 0.97 10.42 ± 1.018 0.009
 Height variancea (mm) −0.26 ± 1.86 1.60 ± 2.65 < 0.001
 Kidney/ Bullet shape 18/6 18/6 1.000
  1. DH indicates disc height, ROM range of motion
  2. a Height variance = cage height – preoperative disc height