Are there any suggestions on an orthopedic doctor to see for a long lasting sprained ankle. preferably a doctor in pennsylvania?

Not one specific: I believe virtually any orthopedist can treat your problem you might want to see someone slanted toward sports medicine you will likely benefit from some physical therapy kind of hard to give you one name-pennsylvania is a very large state.

Many orthopedists: Specialize in a particular area. So try and see one who is a foot and ankle specialist. The feeling being the more they see of that condition the more experience they have.

Podiatrist/orthopedi: You can see a podiatrist or an orthopedic specialist, both are trained and can take care of it in pa.

Ankle: Agree with dr khanna. Consider also member of american orthopedic foot & ankle society.