My daughter's problems started with arch pain. She always had low arches, but around 9th grade her right arch started bothering her and flaring up. She took time off, but next track season her right arch was worse after each race and very swollen after a regional meet (when she had the #1 time in the state). Doctors couldn't find anything wrong, no stress fractures and told her she could run. She felt otherwise, scratched from the state meet and we went looking for better orthodics. That process took us over two years. She ended up with a hard orthodic that really stabilizes her arch and it has a flange that is about three inches high. After she rested her arch and got used to the hard orthodic, she could run without her arch hurting, and it hasn't bothered her since. However, she'd had arch pain off and on for several years and that's when the PTT problem developed (which was resolved this year with ART). She has a lot of scar tissue from the prior arch pain and swelling.
I believe that the arch pain she had came from the tendon as it was being overstreched. It turns out she has a very loose right tendon, a genetic defect. As for the chiropractor, i'm not sure exactly what all he did, but he spent about 30-45 minutes each session pressing deeply into tissue. She would be face down and face up during the sessions.