ALIF is a type of spinal fusion procedure that is performed in the lumbar (lower spine). The spine is approached through the front (anterior) abdomen region.
The intervertebral disc (pillow-like cushions in between your vertebrae that absorb shock) causing discomfort in the lumbar spine is removed, and a bone graft is implanted between the two vertebrae.
As the bone grows and heals itself, it binds (fuses) the two vertebrae together becoming a solid bone.
This procedure is typically performed in an effort to stabilize the spine and therefore reduce pain and decrease deformity.