Just about anyone over the age of 30 has arthritis in at least one joint.

It may or may not be symptomatic.

(Oak has it pegged in her reply.)

There is the kind where your body is attacking its own joint tissues, and there's the kind where your body is creating an "overgrowth" of bone to relieve some stress to the periosteum or cartilage. (since the overgrowth has a function, it is not a pathology)

Neither is a death sentence. Neither means you must give up any activity.

Pictures are ALWAYS more frightening than functional assessments. I'd go with the PT: of course you have arthritis just like everyone, but it may not be the cause of your problem. It may turn out to be your body's way of dealing with the problem!

I hang out with a lot of DI folks, and lemme tell ya', NOBODY has a "normal" diagnostic image. (We all look like train wrecks under the skin.)