Spine
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Descriptive study, stratified sampling. ⋯ 3.
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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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Retrospective cohort study. ⋯ 3.
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Comparative Study
Adjacent segment pathology requiring reoperation after anterior cervical arthrodesis: the influence of smoking, sex, and number of operated levels.
A retrospective study. ⋯ 3.