Anterior lumbar interbody fusion (ALIF) is a surgical procedure to correct the spinal problems from the front of the vertebral body by removing disc or other bone material from in between two adjacent lumbar vertebrae. The surgery can be implemented either as an open surgery or minimally invasive techniques.
Anterior lumbar interbody fusion (ALIF) is a spinal surgery that involves removal of all or part of a herniated disc from in between two contiguous vertebrae (interbody) from the front of the vertebral body in the lower back region (lumbar spine) and fusing or joining the two vertebrae together so that they heal into a single, solid bone. A bone graft or a substitute bone graft can be used on both sides of the remaining disc space of the vertebrae.
The graft material binds the two vertebrae together and promotes bone healing, facilitates the fusion and helps to preserve the normal disc height as the body heals. Along with the vertebral bone, the bone graft also grows and stabilizes the spine. An ‘internal cast’ made up of certain instruments such as rods, screws, plates, cages, hooks and wires can be used to support the vertebral structure during the healing process.
The recommendation of spinal fusion by a surgeon depends on various reasons and the procedure is most commonly used to treat conditions such as one or more fractured vertebra, spondylolisthesis or slippage of one vertebra over another, presence of abnormal curvatures of the spine such as scoliosis or kyphosis, any protrusion or degeneration of the disc (the cartilaginous structure that ‘cushions’ between vertebrae) and instability of the spine or excessive motion between two or more vertebrae.
The ALIF surgery is usually performed under general anesthesia and the patient is positioned in supine lying r on their back. The surgeon makes an incision in the abdomen and retracts abdominal muscles, organs and other vascular structures including major blood vessels such as aorta and vena cava to get a clear view of the front of the spine and accessibility to the vertebrae. Usually this part of the surgery may be executed by a general surgeon or vascular specialist. The surgeon removes the whole or a portion of the degenerated disc from the affected disc space and inserts bone graft or bone graft substitute into the disc space between the vertebral bodies, to promote bone healing and support the disc space. After the completion of the procedure, the abdominal organs, blood vessels and muscles are realigned and the incision is closed.
ALIF is a traditional form of open surgical procedure commonly performed by surgeons. However there is another option to access the spine through application of minimally invasive (endoscopic) technologies. These applications help the surgeon to access the affected vertebrae through small incisions and create intramuscular tunnels to accommodate the surgical tools with special guidance and illumination.