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Table 4 Symptom improvement and MRI finding at 1 year after surgery

From: Bone resorption during the first year after implantation of a single-segment dynamic interspinous stabilization device and its risk factors

  Bone resorption (n = 29) Nobone resorption (n = 15) p
VAS pain score
Baseline 8.0 (6.0, 9.0) 7.0 (6.0, 9.0) .319
1 year 1.0 (0.0, 1.0) 1.0 (0.0, 1.0) .957
Improvement ratea, % 88.9 (85.7, 100.0) 88.9 (80.0, 100.0) .639
ODI
Baseline 82.0 (64.0, 88.0) 70.0 (62.0, 82.0) .224
1 year 4.0 (2.0, 8.0) 4.0 (2.0, 6.0) .869
Improvement ratea, % 94.7 (90.0, 96.7) 93.5 (91.4, 96.3) .776
JOA score
Baseline 3.0 (2.0, 4.0) 5.0 (2.0, 5.0) .090
1 year 14.0 (13.0, 14.0) 14.0 (13.0, 15.0) .378
Improvement ratea, % 76.9 (71.4, 84.6) 66.7 (64.3, 80.0) .164
MRI
Baseline 4.0 (3.0, 4.0) 4.0 (3.0, 5.0) .449
1 year 5.0 (4.0, 5.0) 5.0 (4.0, 6.0) .786
  1. Data are presented as median (IRQ; interquartile range).
  2. VAS, visual analogue scale; ODI, Oswestry Disability Index; JOA, Japanese Orthopedic Association; MRI, magnetic resonance imaging.
  3. aImprovement rate = (value at baseline– value at 1 year postoperative)/baseline value × 100.