Mean VAS pain scores at baseline and at each protocol-specified follow-up time point through 2 years. Mean VAS pain scores at baseline and at each protocol-specified.

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Mean VAS pain scores at baseline and at each protocol-specified follow-up time point through 2 years. 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. Fred H. Geisler Int J Spine Surg 2007;1:12-19 Copyright SAS - Spine Arthroplasty Society 2007