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Dramatically depicts the limited articular range of motion in the rotation of the head and neck secondary to an incorrectly performed anterior spinal fusion surgery (iatrogenic injury). A fusion plate is shown from C5 to C6 with fusion bone masses in place at C5-6 and C6-7.  Above and below the fusion sites are reddened areas illustrating the additional stress to the facet joints on either side of the bony fusion mass.