Spine
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Randomized Controlled Trial Comparative Study
A Randomized, Double-blind, Placebo-Controlled Crossover Trial of Oxymorphone Hydrochloride and Propoxyphene/Acetaminophen Combination for the Treatment of Neurogenic Claudication Associated With Lumbar Spinal Stenosis.
Randomized, double-blind, placebo-controlled, single-dose crossover study. ⋯ 2.
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Comparative Study
Does a zero-profile anchored cage offer additional stabilization as anterior cervical plate?
Retrospective cohort study. ⋯ 4.
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Validation study. ⋯ 3.
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Longitudinal study of the measurement properties of a brief outcome instrument. ⋯ 2.