This is a disk replacement device, which results in a spinal fusion. Once this device is inserted, bone is placed in it and this knits the vertebrae so that it will stay that way forever. Nothing to worry about. Electrical stimulation for bone growth is a valid technology. In the spine, these are usually implanted devices that deliver electrical current to the site.
Bone is deposited in a negative ion field.
These technologies aid these patients. It helps patients who are failing to fuse. Also, it helps smokers and people with bone deficiencies. It is worn externally with a battery that has a seven-month life. My pain is extreme.