Spine
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Randomized Controlled Trial Multicenter Study
Superion interspinous process spacer for intermittent neurogenic claudication secondary to moderate lumbar spinal stenosis: two-year results from a randomized controlled FDA-IDE pivotal trial.
Prospective, multicenter, randomized, controlled, investigational device exemption noninferiority trial. ⋯ 2.
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Randomized Controlled Trial Comparative Study Observational Study
Comparison of 368 patients undergoing surgery for lumbar degenerative spondylolisthesis from the SPORT trial with 955 from the NSQIP database.
Retrospective cohort. ⋯ 3.