Spine
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Retrospective cohort study at a single institution. ⋯ 4.
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Randomized Controlled Trial
Reoperation for Recurrent Intervertebral Disc Herniation In The Spine Patient Outcomes Research Trial: Analysis of Rate, Risk Factors and Outcome.
This study was a post-hoc subgroup analysis of prospectively collected data in the Spine Patient Outcomes Research Trial (SPORT). ⋯ 3.
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A retrospective study of data abstracted from the Diagnosis Procedure Combination (DPC) database, a national representative database in Japan. ⋯ 3.
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An ambispective analysis. ⋯ 2.