Spine
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Systematic review and meta-analysis. ⋯ 3.
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Retrospective cohort study. ⋯ 3.
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Comparative Study Observational Study
Comparative Effectiveness of an Interdisciplinary Pain Program for Chronic Low Back Pain, Compared to Physical Therapy Alone.
This is an observational cohort study. ⋯ 3.
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Multicenter Study
Five-year Results of a Randomized Controlled Trial for Lumbar Artificial Discs in Single-level Degenerative Disc Disease.
A prospective, multicenter, randomized, controlled, investigational device exemption (IDE) noninferiority trial. ⋯ 2.
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A retrospective study. ⋯ 4.