Cranially migrated lumbar intervertebral disc herniations: A multicenter analysis with long-term outcome

Conclusions: Extraligamentous intervertebral disc fragments migrate more cranially than subligamentous intervertebral fragments. The anatomy of the PLL that varies along the corpus is the main reason for the weakness of the resistance of the disc material to the dorsolateral region, direction of discrete force vectors, and orientation of the disc fragment due to torsional vertebral movements.
Source: Journal of Craniovertebral Junction and Spine - Category: Orthopaedics Authors: Source Type: research