Spinal fusions stabilize your spine by preventing movement between two or more vertebrae. 

The spinal fusion may be done on your cervical spine (neck), thoracic spine (upper back), or lumbar spine (lower back). The surgeon uses a bone graft, or a piece of bone from a different part of your body or from a donor, and connects your vertebrae and the bone graft together with metal hardware like screws.

Afterwards you may have to wear a brace for a while. You may also have physical therapy to make sure you heal fully.