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Table 1 The difference of ROM and NZ between unilateral and bilateral cage-instrumented PLIF over flexion-extension, lateral bending and axial rotation

From: Evaluation of unilateral cage-instrumented fixation for lumbar spine

Procedures L F D C P
   unilateral bilateral unilateral bilateral unilateral bilateral unilateral bilateral unilateral bilateral
Flexion Extension (°) ROM (°) 1.9 ± 0.9 2.1 ± 0.8 0.5 ± 0.6 1.7 ± 0.7* 4.2 ± 1.1 7.1 ± 7.3 -10.4 ± 4.4 -13.6 ± 3.3 -3.7 ± 3.8 -5.8 ± 4.8
  NZ (°) 1.2 ± 0.8 1.8 ± 1.2 0.4 ± 0.6 0.3 ± 0.6 1.9 ± 2.4 2.3 ± 5.3 -5.8 ± 1.6 -5.8 ± 3.9 -0.2 ± 1.5 -1.0 ± 2.8
Lateral Bending (°) ROM (°) 0.4 ± 0.4 0.2 ± 0.5 0.7 ± 0.7 0.1 ± 0.5 1.8 ± 1.6 3.7 ± 1.0* -11.5 ± 2.6 -13.2 ± 2.2 -4.1 ± 1.7 -4.2 ± 1.7
  NZ (°) 0.4 ± 0.8 0.9 ±0.9 0.0 ± 0.8 0.0 ± 0.7 -0.6 ± 2.7 -1.6 ± 1.5 -3.1 ± 2.1 -1.5 ± 1.3 -0.1 ± 0.2 -0.2 ± 0.1
Rotation (°) ROM (°) 0.4 ± 0.3 0.2 ± 0.3 0.4 ± 0.3 0.3 ± 0.4 0.7 ± 0.4 0.2 ± 0.3* -0.6 ± 0.6 1.1 ± 0.9* -0.7 ± 0.4 -1.7 ± 0.8*
  NZ (°) 0.1 ± 0.0 0.0 ± 0.1* 0.0 ± 0.1 0.0 ± 0.1 0.1 ± 0.1 -0.1 ± 0.1* 0.0 ± 0.2 0.3 ± 0.1* -0.1 ± 0.1 -0.2 ± 0.1
  1. L: Laminectomy, F: Facetectomy, D: Discetomy, C: Interbody Cage, P: Pedicle screw
  2. Note:
  3. L = (L-I): ROM and NZ of the specimen after laminectomy minus intact status
  4. F = [(I +L+F)-(I+L)]: ROM and NZ of the specimen after facectomy minus laminectomy status
  5. D = [(I+L+F+D)-(I +L+F)]: ROM and NZ of the specimen after discectomy minus facetectomy status
  6. C = [(I+L+F+D+C)-(I+L+F+D)]: ROM and NZ of the specimen after interbody cage insertion minus discectomy status
  7. P = [(I+L+F+D+C+P)-(I+L+F+D+C)]: ROM and NZ of the specimen after tranpedicle screw fixation minus interbody cage insertion status
  8. *: significant: p <.05 compared with unilateral group.