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Table 2 Clinical outcomes at 2 years in patients with preoperative grade I spondylolisthesis

From: Two-year clinical outcomes of a multicenter randomized controlled trial comparing two interspinous spacers for treatment of moderate lumbar spinal stenosis

Variable Experimental Control
Axial pain success, %1 64.7 47.8
Extremity pain success, %1 76.5 69.6
Back function clinical success, %1 61.8 56.5
Freedom from spinous process fracture, %2 100 94.1
Freedom from reoperation, %2 85.0 76.5
  1. 1Among patients who completed 2 years follow-up, preoperative grade I spondylolisthesis was identified in 34 (34%) of 101 in the Experimental group and 23 (25%) of 91 in the Control group.
  2. 2Among all patients included in the safety analyses, preoperative grade I spondylolisthesis was identified in 42 (34%) of 123 in the Experimental group and 36 (28%) of 127 in the Control group.