The intertransversarii muscles connect adjacent transverse processes via short tendinous bands, stabilising the lateral lumbar column during lateral flexion. They are the deepest lateral muscles of the lumbar spine and contribute to fine intersegmental control alongside the multifidus and rotatores.
The intertransversarii tendons are injured in lateral lumbar distraction injuries and contribute to segmental instability in degenerative spondylosis. They are routinely disrupted during lateral lumbar interbody fusion (LLIF) approaches, where the psoas is traversed. Their short lever arm makes them proprioceptive sensors rather than prime movers; their loss may contribute to postoperative instability.
Disruption of the intertransversarii tendon complex during lateral lumbar spine trauma or LLIF surgery contributing to segmental instability and lateral flexion weakness.
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