In reply to im off:
Slightly different here - I was recommended by our GP after a diagnosis of plantar fasciitis in my 50s to go to a place in Kendal that did custom moulded insoles - used by fell runners, skiers etc with problems. (I'd been diagnosed with flat feet in my early 20s too, which always made long days hurt a bit)
I couldn't even endure half an hour at the shops and was thinking of giving up hillwalking as it was getting painful after an hour or so curtailing activity.
I really didn't believe it would work but tried it out of desperation and it was an instant fix with progressive improvement over time.
I'd also suffered with toe stubbing and knee pain particularly on descent since my late 30s. The insoles stopped the toe stubbing and my knees have been better ever since. Quite a marked change and at 64 and 11/12ths I'm really happy about that.
The benefits to my knees were quite unexpected as I'd resigned myself to deterioration that would end the fun in going in the mountains and that has not happened.
slightly off your topic but perhaps relevant in a small way.
Post edited at 09:24