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Table 1 The relationship between posterior screw instrumentation and each surgical cause of revision spinal surgery

From: Unplanned revision spinal surgery within a week: a retrospective analysis of surgical causes

  Instrumentation (n = 4984) No instrumentation (n = 5366) χ2 p
All causes of revision surgery 68 48 5.1472 0.023
All causes of revision surgery excluding screw malposition 27 48 4.4705 0.034
Screw malposition 41 0   n/a
Epidural hematoma 10 17 1.3402 0.247
Inadequate decompression 12 25 3.6765 0.055