Temporomandibular joint disorders are a common cause of chronic musculoskeletal pain worldwide. Among these, internal disc derangement is the most frequent type of disorder. Internal derangement is defined as an abnormal positional and functional relationship between the disc and articulating surfaces. Common clinical symptoms include pain and clicking.Imaging plays a key role in diagnosing temporomandibular joint disorders. It is important for the radiologist to detect early imaging signs of internal derangement, thereby avoiding the evolution of this condition to degenerative joint disease. The aim of this article is to familiarise the reader with the spectrum of imaging findings that are encountered at different stages of the disease.

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Case: Multilevel lumbar spondylolistheses have been reported, but only secondary to degenerative processes. We describe a case where grade 4 anterolisthesis occurred (L3,4,5 over S1) because of multiple level traumatic pedicle avulsion rather than facetal/pars interarticularis/posterior ligamentous complex disruption in a 42-year-old man who presented with paraparesis after a fall from height. Decompression was performed at the L5 level, and pedicle screw fixation was performed at L3, L5, and S1 levels. Conclusion: Although such an injury pattern seems catastrophic, it is deemed relatively stable because of the intact posterior ligamentous complex. Restoration of anatomy with stabilization allowed early mobility and satisfactory neurological recovery.

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