Bone Scan

I recently got a bone age test done and the result is the bone age is approximately 16-17 years. My current age is 20 years. The wrist bone(radius) is not fused and the doctor is telling me that I can yet grow tall. My question is do all the growth plates fuse at the same time or do they follow a pattern like the bones in the wrist will fuse first and then the long bones of the legs will fuse? At this bone age do you think I might grow say an inch or more given that the wrist is not fused? Can I grow through the spine?