REPRINT: Surgical Treatment for Discogenic Low-Back Pain: Lumbar Arthroplasty Results in Superior Pain Reduction and Disability Level Improvement Compared With Lumbar Fusion

Fred H. Geisler

doi:10.14444/8744

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Figure 1
Distribution of VAS pain scores and ODI disability scores for all subjects (i.e., both treatment and control groups). A reasonable approximation of a normal distribution of scores is evident at baseline. However, at 2-year follow-up the distributions are not normal but skew towards the low cut-off end of both scales, indicating a favorable clinical response.
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Figure 2
Mean ODI disability scores at baseline and at each protocol-specified follow-up time point through 2 years. The dotted line indicates the ODI score necessary for minimum clinical improvement, 10 points.¹⁴ (a) Mean scores for 276 subjects in the Charité artificial disc treatment group. There was a significant difference in level of disability at all time points compared to baseline (P< .001), Wilcoxon rank sum test. (b) Mean scores for subjects in the treatment group compared to 99 enrolled subjects in the control group. There was a significant difference in the treatment group with respect to disability, compared to the control group at all postoperative time points (P< .05), Wilcoxon rank sum test.
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Figure 3
Mean VAS pain scores at baseline and at each protocol-specified follow-up time point through 2 years. The dotted line indicates the VAS score necessary for minimum clinical improvement, 19 points.¹⁴ (a) Mean scores for 276 subjects in the Charité artificial disc treatment group. There was a significant difference in pain at all time points compared to baseline (P< .001), Wilcoxon rank sum test. (b) Mean scores for subjects in the treatment group compared to the 99 enrolled subjects in the control group. There was a significant difference in the treatment group with respect to pain, compared to the control group at all postoperative points (P< .05), Wilcoxon rank sum test.