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Table 2 Radiographic analysis between migrated cages in the PCM and control groups

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

  PCM group (n = 24) Control group (n = 163) P-value
Cage position
 Depth ratio −0.119 ± 0.063 0.52 ± 0.107 < 0.001
 Coronal ratio −0.080 ± 0.062 − 0.103 ± 0.089 0.359
Preoperative disc radiographic parameter
 DH (mm) 11.43 ± 2.03 9.34 ± 2.54 < 0.001
 ROM (°) 8.40 ± 5.38 6.38 ± 4.87 0.063
 Translation (mm) 3.34 ± 2.45 2.11 ± 2.25 0.014
 Slippage (%) 10.60 ± 10.54 7.32 ± 9.79 0.130
Cage size & geometry
 Cage height (mm) 11.17 ± 0.97 10.91 ± 1.15 0.302
 Height variancea (mm) −0.26 ± 1.86 1.57 ± 2.36 < 0.001
 Kidney/ Bullet shape 18/6 90/73 0.067
  1. DH indicates disc height, ROM range of motion
  2. aHeight variance = cage height – preoperative disc height