Approach for Extreme lateral lumbar disc herniation.
The paramuscular approach requires a larger incision and greater soft-tissue retraction, but exposes less of the foramen; 1) its advocates find the muscle-splitting approach disorientating because of the lack of anatomical landmarks 2) 3).
The target of the surgical exposure is the isthmus. Good knowledge of the anatomic features of the intervertebral foramen and intertransverse space is mandatory 4).