Usually you can decide who you want to know about your spinal surgery. However, there are a few people that you should definitely inform.
Your dentist
Some teens who have gone through surgery need antibiotics before seeing the dentist. Your surgeon will let you know if this is necessary. Before you have any dental work or surgery done, let your dentist know you have had spine surgery.
Airport security
In these times, airport security is especially strict. It is very unlikely that the security detector will sound off when you go through it. If it does, just explain that you have had back surgery and that you have a spinal implant attached to your spinal column.