I'm not a doctor, but turf toe is a sprain and inflammation, hallux rigidus is arthritis. For me, I had a section of my toe that had extended over the joint and limited the range of motion. It wasn't inflamed or swollen, just an extra ridge around the toe joint from the arthritis. I don't think mine was caused by any specific injury, just overall accumulated abuse over the years. So there probably is a bit of both. There may be some arthritis accumulated, but the PT exercise could definitely cause inflammation of the joint itself.

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