Background: Traumatic unilateral facet dislocation without fracture is an uncommon injury of the lumbosacral junction. We describe a case of a unilateral perched L5–S1 facet causing axial back pain and radiculopathy provoked by motion. Case Description: The patient underwent reduction with complete facetectomy followed by internal fixation at L5–S1, facilitating decompression of the S1 nerve root. Postoperatively, the patient reported improvement in her pain. Conclusions: This injury can be recognized using subtle clues, such as transverse process fractures and/or widened posterior elements. Despite its rarity, when identified, this injury can be characterized using the new TLICS system for thoracolumbar fractures and should be managed accordingly.
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