The new millennium has witnessed the emergence of minimally invasive, non-posterior based surgery of the lumbar spine, in particular via lateral based methodologies to discectomy and fusion. In contrast, and perhaps for a variety of reasons, anterior motion preservation (non-fusion) technologies are playing a comparatively lesser, though incompletely defined, role at present. Lateral based motion preservation technologies await definition of their eventual role in the armamentarium of minimally invasive surgical therapies of the lumbar spine. While injury to the major vascular structures remains the most serious and feared complication of the anterior approach, this occurrence has been nearly eliminated by the use of lateral based approaches for discectomy and fusion cephalad to L5-S1. Whether anterior or lateral based, non-posterior approaches to the lumbar spine share certain access related pitfalls and complications, including damage to the urologic and neurologic structures, as well as gastrointestinal and abdominal wall issues. This review will focus on the recognition, management and prevention of these anterior and lateral access related complications.
INTRODUCTIONAnterior spinal access is often required for the treatment of spinal deformity, bony and/or discogenic infection, trauma, tumor and degenerative disease. Advantages of this approach include performance of a thorough discectomy and release, capability to implant high profile interbody fusion and non-fusion devices, debridement and excision of necrotic tissue, removal of migrated/ misplaced devices, and a favorable milieu for interbody fusion with rich blood supply and graft/device placement under compression. The most common associated complications include damage to the vascular, urologic and neurologic structures, as well as gastrointestinal and abdominal wall issues.
VASCULAR INJURYAnterior exposure of the spine at the L4-L5 and L5-S1 levels requires mobilization of the left common iliac vessels, as they course obliquely across the anterior aspect of the L5 body, traversing variable portions of the L4-L5 and L5-S1 disc spaces in the process. The most dorsally located, the left common iliac vein is the most likely vascular structure to be injured during anterior lumbar spinal surgery. Apart from intraoperative hemorrhage and the challenge associated with vascular control and repair,
TOPIC HIGHLIGHTthrombotic occlusion may occur in the postoperative period following seemingly uncomplicated iliac venorrhaphy, or simply as a result of prolonged retraction of the iliac vein or inferior vena cava. The ascending iliolumbar vein acts as an important dorsolateral tether to the left common iliac vein, therefore routine ligation and division will facilitate anterior exposure of the L4-L5 disc space [1] . Similarly, ligation and division of the L4 segmental vessels will release the aortic terminus and the terminal inferior vena cava (IVC), thus permitting retraction to the right side of the spine, further facilitating anterior exposure of the L4...