I am NOT a PT, and don't know much about PF other than basically what it is, so this may or may not be useful, but I thought I might share my experience in case it offers something you haven't tried yet (maybe one of the PT ladies could comment on whether or not it might be useful).
I got peroneal tendinitis while in the later stages of marathon training this spring (thus no marathon for me... grrrr... next year...). It's often an overuse injury like PF, though in my case it was an acute injury from a misplaced footfall. Initially it was quite painful (I couldn't walk for more than 100 yards or so without starting to limp).
My PT prescribed iontophoresis (they tape a pad with contacts soaked in steroid solution to your foot, and then hook it up to a battery pack and run current through it for 20 minutes or so. I guess the solution has a different polarity than the current, which causes it to be pushed deeper into the tissue than would otherwise be the case with a topical application). We did about 12 sessions. I would say the first 3-4 actually helped -- they took the worst of the acute inflammation away and made it possible for me to walk normally (it was really helpful for me to wear super stable shoes to walk in everyday while I was trying to heal -- I wore the Brooks Trail Runners that are uncomfortably stable for me to run in, but they really helped keep my foot from hurting as I went about my daily activities). Anyway, the rest of the ionto sessions really did nothing -- my condition just plateaued to where I could walk and go about my business well (though a full day on my feet would be an issue), but I couldn't run more than two miles without a flare-up.
They did a full eval at this point, to see if orthotics would help. I was told that I have a structural deformity that prevents my heels/rearfoot from moving much at all during my gait cycle, and since I have fairly high, rigid arches, my forefeet are basically left to do all the compensation for this. She said my gait looks remarkably normal given this, but it puts alot of stress on the supporting muscles in my foot since they are always working and doing more than they were "designed" to do. PT was on the fence about whether orthotics were necessary/would be helpful...
So we had to come up with some other course of treatment. It had been almost two months since my injury and I still couldn't run. The woman who evaluated me (a different doctor at my University rehab clinic than the woman who was treating me regularly) suggested -- and I hope I have the name right here -- postural release work, since she theorized that the constant tension in my foot/lower leg might be responsible for my slow healing. Basically, the PT would do a little massage along the affected tendon/muscles, find trigger spots, and then position my foot/leg in such a way as to neutralize the tension (I'm SURE someone can do a better job explaining this). Anyway, although it hurt, it was MIRACULOUS for me. After two sessions I was able to run 6 miles with minimal pain. After two more sessions I was back to running as much as I could (in my out-of-shape state, at that point!) with no pain. I wish we'd started it earlier instead of wasting time & money on ionto... So, I know you mentioned that you'd done massage, but I wondered, if you have not tried this particular technique, if it might be of value...
Sorry this is so long. I hope your condition gets better soon. Painful feet are a real drag.



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Also, today is "move in day" for our freshmen students, so I'm wearing tennis shoes and I've taken the green superfeet out of my hiking boots and put them in my tennis shoes. I'll let you know how the day goes!