The lumbosacral ligament is a strong fibrous band connecting the inferior transverse process of L5 to the lateral sacral ala, effectively tethering L5 to the sacrum and reinforcing the L5-S1 facet capsule.
Resists excessive L5 mobility on the sacrum, reinforces the iliolumbar ligament system at the L5-S1 level, and contributes to lumbosacral junction stability — the level subjected to the greatest biomechanical stress in the lumbar spine.
The lumbosacral ligament is at risk during L5-S1 surgery, particularly in interbody approaches requiring mobilisation of L5. Its disruption contributes to post-operative lumbosacral instability. The superior L5 nerve root runs directly beneath this ligament and can be compressed by lumbosacral ligament hypertrophy.
Hypertrophied lumbosacral ligament compressing the L5 nerve root producing L5 radiculopathy, requiring targeted decompression distinct from standard disc surgery.
Disruption of the lumbosacral ligament contributing to L5-S1 instability after posterior approaches to the lumbosacral junction.
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