• Kjell Olmarker.
• Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, Göteborg University, Gothenburg, Sweden. kjell.olmarker@orthop.gu.se
• Spine. 2008 Apr 15;33(8):850-5.

Study DesignChanges in spontaneous behavior was studied in rats after a controlled puncture of a lumbar intervertebral disc.ObjectiveTo study if puncture of a lumbar disc would induce recordable changes in spontaneous pain behavior.Summary Of Background DataAnular tears are common and may be found both in patients with low back pain and in asymptomatic patients. It has been suggested that anular injury may relate to low back pain either by stimulation of local sensory receptors in the posterior part of the anulus fibrosus or by ingrowth of newly formed nerve fibers into the deeper parts of the disc. The objective of the study was to analyze if a controlled puncture of a lumbar intervertebral disc might induce recordable changes in spontaneous behavior of rats.MethodsAfter anesthesia, the L4-L5 disc was punctured in 10 rats. Ten other rats received sham surgery. Spontaneous behavior was assessed at days 1, 3, 7, 14, and 21 after surgery.ResultsStatistically significant differences in behavior were seen at all days analyzed. Most consistent were increases in "grooming" and in "wet-dog shakes."ConclusionPuncture of a lumbar intervertebral disc in the rat produces changes in spontaneous behavior mainly seen as increased "grooming" and "wet-dog shakes," 2 behaviors that have been suggested to indicate stress and pain.

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