[Ann R]

one who specializes in treating diseases of bones and joins is a(n)

[APenguin]

Osteopath would fit the bill. There could be someone more specific, but that's my answer.































en.wikipedia.org

[Reddkatz]

There's rhuematologists who specialize in treating arthritis in bones, joints and muscles. But sometimes they'll treat diseases involving bones and joints. There's also orthopaedic doctors who'll treat patients too especially if they have Paget's disease. Sometimes endocrinologists will treat patients who have osetoperosis as well.

[Mother M]

you are looking for an Orthopedic Surgeon. Just because they are a surgeon doesn't mean that you would require surgery.