Evaluation of Decompression and Interlaminar Stabilization Compared with Decompression and Fusion for the Treatment of Lumbar Spinal Stenosis: 5-year Follow-up of a Prospective, Randomized, Controlled Trial

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Fig. 1
Among patients who were reoperated, the percentage of those reoperations in each of the annual time periods. In the D+ILS group, reoperations occurred earlier than in the D+PS group.
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Fig. 2
Mean ODI scores improved significantly in both groups and remained improved throughout follow-up. Error bars represent the standard deviation.
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Fig. 3
Percentage of patients achieving ≥15 point decrease in ODI scores compared to baseline at each follow-up time point.
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Fig. 4
Mean VAS back pain scores (A) and worse leg pain scores (B) improved significantly in both groups and remained improved throughout follow-up. Error bars represent the standard deviation.
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Fig. 5
Zurich Claudication Questionnaire Scores on the symptom severity (A), physical function (B) and patient satisfaction (C) scales.

Table 1

Month 60 overall efficacy of subjects achieving clinical success defined by the individual components of success.

	D+ILS			D+PS
Status pre-op compared with Month 60	N assessed	N meeting criterium	%	N assessed	N meeting criterium	%	p-value
Improvement of≥15 points in ODI at Month 60 compared to baseline	124	100	80.6	55	41	74.5	>0.40
No reoperation or epidural steroid injection	215	148	68.8	107	71	66.4	>0.70
No reoperations, revisions, removals, or supplemental fixation	215	179	83.3	107	89	83.2	>0.90
No epidural injection at any lumbar level	215	173	80.5	107	82	76.6	>0.40
No persistent new or increasing sensory or motor deficit	88	83	94.3	40	40	100.0	>0.30
No persistent new or increasing sensory deficit	148	143	96.6	66	66	100.0	>0.30
No persistent new or increasing motor deficit	146	144	98.6	74	72	97.3	>0.60
No major device-related complications	215	212	98.6	107	102	95.3	>0.10
Composite Clinical Success (Month 60 CCS-FDA)	191	96	50.3	91	40	44.0	>0.30

Table 2

Classification of reoperations/revisions by category.

Table 3

Percentage of patients using narcotics to manage pain at each time point.