Spinal fusion is a surgical procedure used to join two or more vertebrae together in the spine, typically to stabilize the spine and alleviate pain associated with conditions such as degenerative disc disease, spinal stenosis, fractures, or scoliosis. During the procedure, bone grafts or bone graft substitutes are placed between the vertebrae, and metal implants may be used to hold the vertebrae in place while the bones fuse together. Spinal fusion is a common treatment for various spinal disorders and can help improve spine stability and reduce pain in patients.