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Mechanical hyperalgesia in the forepaw as measured by the average±S.D. withdrawal threshold (g) elicited by von Frey filament stimulation. Forepaw hyperalgesia is induced after facet joint injury compared to baseline (p≤0.001) on all days but sham responses are unchanged from baseline. Withdrawal threshold in the injury group is significantly reduced (*p≤0.0002) compared to sham at each post-operative time point.
