24-Month Outcomes of Indirect Decompression Using a Minimally Invasive Interspinous Fixation Device versus Standard Open Direct Decompression for Lumbar Spinal Stenosis: A Prospective Comparison.

Mean improvements in walking distance and number of sitting-to-standing repetitions were larger for the IFD group than the decompression group at all follow-up time points, however the only marginally significant difference was seen in walking distance at the 6-month follow-up (p=0.019, Bonferroni adjusted α=0.0125).

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