Does any kind of doctor know everything about shoulder injuries?

Depends: Most primary care physicians probably have some knowledge of shoulder injuries, but if you are looking for someone with specialized training you should see a physiatrist, orthopedist or sports medicine specialist.

Orthopedic Surgeons: Orthopedic surgeons are trained in examining and treating problems of bones and joints. The shoulder is one of them. There are shoulder and elbow surgeons, sports surgeons, and upper extremity surgeons who sub specialize in shoulder problems.

Shoulder: Also primary care physicians with additional training in sports medicine and also physical medicine physicians (physiatrists).

No.: You should see a fellowship trained orthopedic shoulder surgeon, who is most likely to know everything about shoulder injuries.

Orthopedic doctor: will know the most about shoulder injuries. Some orthopods specialize in shoulder injuries