Spinal Surgery Step - Placement of Bone Graft for Cervical Fusion. Depicts a bone graft being placed into an open incision for a two-level anterior cervical fusion. The upper intervertebral space is receiving a bone graft while the lower intervertebral space is decompressed and clear of any disc material. Retractors are shown exposing the cervical vertebrae and intervertebral spaces. The bone graft is rectangular in shape representative of a Smith-Robinson anterior cervical fusion procedure.