BBTW, I also have PF at both feet (I walk too much around barefoot) and when skiing, it actually gets better , simply because I used a personalised foot sole...I also had to throw away all old running shoes (but also specifically my beloved Birkenstock Boston) and buy new ones, possibly well "cushioned"...
Interesting. I had a plantar plate issue pop up last summer when walking/running in a pair of On Cloudventure trail running shoes on the pavement (which BTW suck, I'm much happier in the
Altra Olympus 4 and New Balance
Fresh Foam More V1 trail shoes of the current quiver).
Two doctor neighbors, one a marathon runner said it was mortons neuroma. I looked at every medical website and concluded because it was between the wrong two toes, I didn't feel a BB size lump when I'd squeeze the area (pressing from top of foot and bottom of foot), so it couldn't be mortons. To me it fit a plantar plate injury, which I read is common with upper leg/calf injuries and I've been having trouble with the calf and hamstring insertion tendonitis for two years now, (with physical therapy), the self diagnosis fit. I could've asked my orthopedic surgeon cousin but I don't like bothering him with minor injuries, not to be seen as a "boy who cried wolf". Which was a good move because he was very helpful a few month latter (Sept), when I wrecked my shoulder inline skating. Surgeon neighbor said either torn labrum or rotator cuff, call your cousin! Cousin said I likely tore the rotator cuff, give it time (a month latter he called to ask how it was coming along and said time is the best medicine). Initially, he had wanted me to get an X-ray but I said no, Covid risk, again he said just give it time. Took a good 5 months of tolerating it but now the shoulder is doing 95% better and back to 100% range of motion. ROM was very limited for the first three months. Anyway back to the plantar plate, I told the doctor (surgeon) neighbor who doesn't run of my findings and logic he agreed, said plantar plate.
Interestingly, I had to stop wearing all of my Birkenstock sandals, the cork bottoms are so sunken from use that they have a lengthwise mogul before the metatarsals which aggravates the plantar plate issue.
Even more interesting, I didn't need to put a doughnut (corn) bandage pad on the spot as the runner doctor suggested, as I found I was ok wearing my zero drop Merrell minimalist trail glove shoes so I ordered a pair of zero drop
Altra Paradigm 4.5 road shoes which also worked well.
As to the OP,
@Philpug, sounds to me like Peroneal Tendonitis. I was non weight bearing for a month, followed by three months physical therapy with that one. Then again mine went while running and at the time I continued another 4 miles walking on it. Had thought it was a stress fracture until after a month or six weeks (I forget) when the X-ray didn't show bone growth of a healing fracture. MRI confirmed Peroneal Tendonitis, which prior to the MRI was what my orthropod cousin immediately said when the X-ray was clean and the "local" orthropod said could be either or both!
Latter, the Physical Therapist and I concluded the root cause was my carbon fibre low cut inline speed skates pressing on it. I always would get a reoccurring cyst on the spot during skate season which would go away when out of the speed skates for a few winter months. PT said the speed skate locking the foot in from flexing as one skates with all flexing occurring only at the ankle doesn't allow for the Peroneal to get stretched and retracted going thru the motion as it would walking, thus contributed to the P tendonitis developing. Possibly and probably similar to the foot being held flat in a ski boot, only you don't have the pressure of a hard carbon fibre upper and abrupt top edge (collar) constantly pressing at the top of the Lateral Mallelous with every power push.
Good luck.
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